Land Use Type

14,000,000 Leading Edge Experts on the ideXlab platform

Scan Science and Technology

Contact Leading Edge Experts & Companies

Scan Science and Technology

Contact Leading Edge Experts & Companies

The Experts below are selected from a list of 70431 Experts worldwide ranked by ideXlab platform

Scott X Chang - One of the best experts on this subject based on the ideXlab platform.

  • Land Use Type and Land management and disturbance affect soil δ 15 n a review
    Journal of Soils and Sediments, 2020
    Co-Authors: Woojung Choi, Jinhyeob Kwak, Hyunjin Park, Hye In Yang, Sein Park, Sangmo Lee, Sangsun Lim, Scott X Chang
    Abstract:

    We compared the patterns of natural abundance of nitrogen (N) isotope ratio (δ15N) of total soil N among cropLand, forest, and grassLand soils, with special interests in the effects of farming system on cropLand and grassLand, and climate zone on forest soils, as well as the general effect of Land-Use change and site disturbance. We analyzed data on δ15N of terrestrial N sources (n = 532), cropLand (n = 168), forest (n = 227 for organic and 428 for mineral soil layers), and grassLand soils (n = 624). Forest soils had the lowest δ15N (– 1.0 ± 0.2‰ and + 3.1 ± 0.2‰ for mineral and organic soil layers, respectively), reflecting the influence of the 15N-depleted source N and the more closed nature of the N cycle. Tropical forest soil had higher δ15N than other climate zones, reflecting the influence of the high N availability and loss in tropical forests. The low δ15N in subtropical forest soils likely reflected the influence of the high rate of deposition of 15N-depleted N. The δ15N of cropLand (+ 5.0 ± 0.2‰) and grassLand (+ 6.2 ± 0.1‰) soils was greater with manure than with synthetic fertilizer applications. Soil δ15N was also affected by Land-Use change and was often increased (followed by progressive decreases) by site disturbance. Land-Use Type and Land management effects on soil δ15N reflect changes in both the N sources and loss, while Land disturbance effects are primarily associated with the degree of N loss. We also conclude that subtropical forest soil δ15N is affected by the high rate of atmospheric N deposition.

  • temperature sensitivity of soil carbon and nitrogen mineralization impacts of nitrogen species and Land Use Type
    Plant and Soil, 2013
    Co-Authors: Shanghua Sun, Jianjun Liu, Scott X Chang
    Abstract:

    Background and aims Climate warming, nitrogen (N) deposition and Land Use change are some of the drivers affecting ecosystem processes such as soil carbon (C) and N dynamics, yet the interactive effects of those drivers on ecosystem processes are poorly understood. This study aimed to understand mechanisms of interactive effects of temperature, form of N deposition and Land Use Type on soil C and N mineralization. Methods We studied, in a laboratory incubation experiment, the effects of temperature (15 vs. 25 °C) and species of N deposition (NH4 + -N vs. NO3 � -N) on soil CO2 efflux, dissolved organic C (DOC) and N (DON), NH4 + -N, and NO3 � -N concentrations using intact soil columns collected from adjacent forest and grassLand ecosystems in north-central Alberta. Results Temperature and Land Use Type interacted to affect soil CO2 efflux, concentrations of DON, NH4 + N and NO3 � -N in most measurement times, with the higher incubation temperature resulted in the higher CO2 efflux and NH4 + -N concentrations in forest soils and higher DON and NO3 � -N concentrations in grassLand soils. Temperature and Land Use Type affected the cumulative soil CO2 efflux, and DOC, DON, NH4 + -N and NO3 � -N concentrations. The form of N added or its interaction with the other two factors did not affect any of the C and N cycling parameters. Conclusions Temperature and Land Use Type were dominant factors affecting soil C loss, with the soil C in grassLand soils more stable and resistant to temperature changes. The lack of short-term effects of the deposition of different N species on soil C and N mineralization suggest that maybe there was a threshold for the N effect to kick in and long-term experiments should be conducted to further elucidate the species of N deposition effects on soil C and N cycling in the studied systems.

  • effects of Land Use Type and incubation temperature on greenhoUse gas emissions from chinese and canadian soils
    Journal of Soils and Sediments, 2011
    Co-Authors: Zucong Cai, Man Lang, Scott X Chang
    Abstract:

    Land Use Type is an important factor influencing greenhoUse gas emissions from soils, but the mechanisms involved in affecting potential greenhoUse gas (GHG) emissions in different Land Use systems are poorly understood. Since the northern regions of Canada and China are characterized by cool growing seasons, GHG emissions under low temperatures are important for our understanding of how soil temperature affects soil C and N turnover processes and associated greenhoUse gas emissions in cool temperate regions. Therefore, we investigated the effects of temperature on the emission of N2O, CO2, and CH4 from typical forest and grassLand soils from China and Canada. The soils were incubated in the laboratory at 10°C and 15°C under aerobic conditions for 15 days. The results showed that Land Use Type had a large impact on greenhoUse gas emissions. The N2O emissions were significantly higher in grassLand than in forest soils, while CO2 emissions were higher in forest than in grassLand soils. GrassLand soils were weak sources of CH4 emission, while forest soils were weak sinks of atmospheric CH4. The global warming potential of forest soils was significantly greater than that of grassLand soils. Soil pH, C/N ratio, and soluble organic carbon concentrations and clay content were dominant factors influencing the emissions of N2O and CO2, respectively. Increasing temperature from 10°C to 15°C had no effects on CH4 flux, but significantly increased N2O emissions for all studied soils. The same pronounced effect was also found for CO2 emission from forest soils. Indications from this study are that the effects of Land Use Type on the source–sink relationship and rates of GHG emissions should be taken into consideration when planning management strategies for mitigation of greenhoUse gas emissions in the studied region, and temperature changes must be taken into account when scaling up point- or plot-based N2O and CO2 flux data to the Landscape level due to large spatial and temporal variations of temperature that exist in the field. The reader is cautioned about the limitation with incubation studies on a limited number of samples/locations, and care need to be exercised to extrapolate the result to field conditions.

  • Land Use Type and temperature affect gross nitrogen transformation rates in chinese and canadian soils
    Plant and Soil, 2010
    Co-Authors: Zucong Cai, Man Lang, Bruno Mary, Xiying Hao, Scott X Chang
    Abstract:

    Land-Use Type affects gross nitrogen transformation and this information is particularly lacking under varied low temperature conditions. In this study, the effects of Land-Use Type (forest vs. grassLand) and temperature (10 vs. 15°C) on gross N transformation rates under aerobic conditions were investigated using the 15N isotope pool dilution technique in the laboratory. Soils were collected from forest and grassLand sites in China and Canada. The results showed that gross N mineralization and immobilization rates were significantly higher in forest soils than in grassLand soils, while the reverse was true for gross nitrification rates. The higher TC and lower SOCw concentrations in the Chinese soils relative to the Canadian soils were related to the greater gross N mineralization rates and lower gross N immobilization rates in Chinese soils. The greater gross N mineralization rates and lower gross N immobilization rates resulted in much higher inorganic N accumulation and that may increase the risk of NO3− leaching in the Chinese soils. Increasing temperature significantly increased gross nitrification rates in grassLand soils and gross N immobilization rates in forest soils, suggesting that grassLand soils maybe more vulnerable to N loss through NO3− leaching or denitrification (when conditions for denitrification exist) and that conversion of grassLand to forest soils may exert less negative effects on the environment by promoting the retention of N and decreasing the production of NO3− and subsequently the risk of NO3− leaching under increasing temperature by global warming.

  • Land-Use Type and temperature affect gross nitrogen transformation rates in Chinese and Canadian soils
    Plant and Soil, 2010
    Co-Authors: Man Lang, Zucong Cai, Bruno Mary, Xiying Hao, Scott X Chang
    Abstract:

    Land-Use Type affects gross nitrogen transformation and this information is particularly lacking under varied low temperature conditions. In this study, the effects of Land-Use Type (forest vs. grassLand) and temperature (10 vs. 15 degrees C) on gross N transformation rates under aerobic conditions were investigated using the (15)N isotope pool dilution technique in the laboratory. Soils were collected from forest and grassLand sites in China and Canada. The results showed that gross N mineralization and immobilization rates were significantly higher in forest soils than in grassLand soils, while the reverse was true for gross nitrification rates. The higher TC and lower SOCw concentrations in the Chinese soils relative to the Canadian soils were related to the greater gross N mineralization rates and lower gross N immobilization rates in Chinese soils. The greater gross N mineralization rates and lower gross N immobilization rates resulted in much higher inorganic N accumulation and that may increase the risk of NO(3)(-) leaching in the Chinese soils. Increasing temperature significantly increased gross nitrification rates in grassLand soils and gross N immobilization rates in forest soils, suggesting that grassLand soils maybe more vulnerable to N loss through NO(3)(-) leaching or denitrification (when conditions for denitrification exist) and that conversion of grassLand to forest soils may exert less negative effects on the environment by promoting the retention of N and decreasing the production of NO(3)(-) and subsequently the risk of NO(3)(-) leaching under increasing temperature by global warming.

Junzhong Tan - One of the best experts on this subject based on the ideXlab platform.

Zucong Cai - One of the best experts on this subject based on the ideXlab platform.

  • N2O production pathways relate to Land Use Type in acidic soils in subtropical China
    Journal of Soils and Sediments, 2016
    Co-Authors: Yi Zhang, Jinbo Zhang, Wei Zhao, Zucong Cai
    Abstract:

    Purpose Agricultural practises impact soil properties and N transformation rate, and have a greater effect on N2O production pathways in agricultural soils compared with natural woodLand soils. However, whether agricultural Land Use affects N2O production pathways in acidic soils in subtropical regions remains unknown.

  • effects of Land Use Type and incubation temperature on greenhoUse gas emissions from chinese and canadian soils
    Journal of Soils and Sediments, 2011
    Co-Authors: Zucong Cai, Man Lang, Scott X Chang
    Abstract:

    Land Use Type is an important factor influencing greenhoUse gas emissions from soils, but the mechanisms involved in affecting potential greenhoUse gas (GHG) emissions in different Land Use systems are poorly understood. Since the northern regions of Canada and China are characterized by cool growing seasons, GHG emissions under low temperatures are important for our understanding of how soil temperature affects soil C and N turnover processes and associated greenhoUse gas emissions in cool temperate regions. Therefore, we investigated the effects of temperature on the emission of N2O, CO2, and CH4 from typical forest and grassLand soils from China and Canada. The soils were incubated in the laboratory at 10°C and 15°C under aerobic conditions for 15 days. The results showed that Land Use Type had a large impact on greenhoUse gas emissions. The N2O emissions were significantly higher in grassLand than in forest soils, while CO2 emissions were higher in forest than in grassLand soils. GrassLand soils were weak sources of CH4 emission, while forest soils were weak sinks of atmospheric CH4. The global warming potential of forest soils was significantly greater than that of grassLand soils. Soil pH, C/N ratio, and soluble organic carbon concentrations and clay content were dominant factors influencing the emissions of N2O and CO2, respectively. Increasing temperature from 10°C to 15°C had no effects on CH4 flux, but significantly increased N2O emissions for all studied soils. The same pronounced effect was also found for CO2 emission from forest soils. Indications from this study are that the effects of Land Use Type on the source–sink relationship and rates of GHG emissions should be taken into consideration when planning management strategies for mitigation of greenhoUse gas emissions in the studied region, and temperature changes must be taken into account when scaling up point- or plot-based N2O and CO2 flux data to the Landscape level due to large spatial and temporal variations of temperature that exist in the field. The reader is cautioned about the limitation with incubation studies on a limited number of samples/locations, and care need to be exercised to extrapolate the result to field conditions.

  • influence of Land Use Type on moisture effect of nitrification in subtropical red soils
    Environmental Sciences, 2010
    Co-Authors: Chen Qian, Zucong Cai
    Abstract:

    Air-drying is always accompanied by soil moisture loss. The different influences of air-drying on soil nitrification might due to the different nitrification responses to moisture changing of acid subtropical soils. So, after applying 0 and 150 mg x kg(-1) of ammonium bicarbonate, a 35-day incubation study was conducted to determine the nitrification potential of four acid subtropical soils under 5 soil moisture levels, namely 30% water-holding capacity (WHC), 45% WHC, 60% WHC, 75% WHC and 90% WHC. Four soils, designated QR, QU, SR and SU, derived from Quaternary red earth and Tertiary red sandstone, were collected from rice and upLand field. The results indicated that the soil nitrification was significantly influenced by the moisture content (p < 0.01), and the nitrification sensitivities to soil moisture content varied with Land-Use Types. For the treatments without ammonium input, the ranges of nitrification ratio were 11% and 8% in upLand soils, QU and SU respectively, which were obviously lower than those in paddy soils (35% for QR, and 20% for SR). The ammonium input would increase the ranges of nitrification ratio which were 56%, 26%, 31%, and 26% for soil QR, QU, SR, and SU, respectively. And the ammonium input would accelerate soil acidification under high moisture levels. In a word, the Land-Use Type presents a significant influence on the nitrification response to moisture content, which might lead to the difference of air-drying effect.

  • Land Use Type and temperature affect gross nitrogen transformation rates in chinese and canadian soils
    Plant and Soil, 2010
    Co-Authors: Zucong Cai, Man Lang, Bruno Mary, Xiying Hao, Scott X Chang
    Abstract:

    Land-Use Type affects gross nitrogen transformation and this information is particularly lacking under varied low temperature conditions. In this study, the effects of Land-Use Type (forest vs. grassLand) and temperature (10 vs. 15°C) on gross N transformation rates under aerobic conditions were investigated using the 15N isotope pool dilution technique in the laboratory. Soils were collected from forest and grassLand sites in China and Canada. The results showed that gross N mineralization and immobilization rates were significantly higher in forest soils than in grassLand soils, while the reverse was true for gross nitrification rates. The higher TC and lower SOCw concentrations in the Chinese soils relative to the Canadian soils were related to the greater gross N mineralization rates and lower gross N immobilization rates in Chinese soils. The greater gross N mineralization rates and lower gross N immobilization rates resulted in much higher inorganic N accumulation and that may increase the risk of NO3− leaching in the Chinese soils. Increasing temperature significantly increased gross nitrification rates in grassLand soils and gross N immobilization rates in forest soils, suggesting that grassLand soils maybe more vulnerable to N loss through NO3− leaching or denitrification (when conditions for denitrification exist) and that conversion of grassLand to forest soils may exert less negative effects on the environment by promoting the retention of N and decreasing the production of NO3− and subsequently the risk of NO3− leaching under increasing temperature by global warming.

  • Land-Use Type and temperature affect gross nitrogen transformation rates in Chinese and Canadian soils
    Plant and Soil, 2010
    Co-Authors: Man Lang, Zucong Cai, Bruno Mary, Xiying Hao, Scott X Chang
    Abstract:

    Land-Use Type affects gross nitrogen transformation and this information is particularly lacking under varied low temperature conditions. In this study, the effects of Land-Use Type (forest vs. grassLand) and temperature (10 vs. 15 degrees C) on gross N transformation rates under aerobic conditions were investigated using the (15)N isotope pool dilution technique in the laboratory. Soils were collected from forest and grassLand sites in China and Canada. The results showed that gross N mineralization and immobilization rates were significantly higher in forest soils than in grassLand soils, while the reverse was true for gross nitrification rates. The higher TC and lower SOCw concentrations in the Chinese soils relative to the Canadian soils were related to the greater gross N mineralization rates and lower gross N immobilization rates in Chinese soils. The greater gross N mineralization rates and lower gross N immobilization rates resulted in much higher inorganic N accumulation and that may increase the risk of NO(3)(-) leaching in the Chinese soils. Increasing temperature significantly increased gross nitrification rates in grassLand soils and gross N immobilization rates in forest soils, suggesting that grassLand soils maybe more vulnerable to N loss through NO(3)(-) leaching or denitrification (when conditions for denitrification exist) and that conversion of grassLand to forest soils may exert less negative effects on the environment by promoting the retention of N and decreasing the production of NO(3)(-) and subsequently the risk of NO(3)(-) leaching under increasing temperature by global warming.

Karen Hahn - One of the best experts on this subject based on the ideXlab platform.

  • impact of Land Use Type and harvesting on population structure of a non timber forest product providing tree in a semi arid savanna west africa
    Biological Conservation, 2011
    Co-Authors: Katharina Schumann, Rudiger Wittig, Adjima Thiombiano, Ute Becker, Karen Hahn
    Abstract:

    Non-timber forest products (NTFPs) strongly contribute to livelihood security in the semi-arid tropics. Main factors determining the populations of NTFP-providing species are human activities. This study examined the impact of Land-Use, combined with rates and patterns of debarking and chopping on a NTFP-providing tree (Anogeissus leiocarpa) in Burkina Faso. We compared stands in a protected area (W National Park) with those of its surrounding communal area (fallows, cropLands) in order to (i) obtain an indication on the status of the population, (ii) assess its harvesting tolerance, (iii) estimate the sustainability of present management, and (iv) derive which additional management strategies may foster its conservation. Our results reveal that the stands of A. leiocarpa are in healthy states in fallows and in the park. In cropLands, the absence of saplings gives evidence of a declining population. Nearly all individuals of A. leiocarpa were harvested in cropLands and fallows, while the number of harvested individuals in the park was negligible. Intensity of debarking and chopping was tree size-specific. The sprouting ability significantly increased with higher chopping intensity. We conclude that despite the Land-Use impact and the intense harvesting, stands of A. leiocarpa are still well preserved due to the species life history (fast growing and high sprouting) and due to indirect positive influences of human activities by providing better environmental conditions for its recruitment. Thus, the population of A. leiocarpa is not at risk to over-harvesting and Land-Use even though it is not protected.

  • impact of Land Use Type and bark and leaf harvesting on population structure and fruit production of the baobab tree adansonia digitata l in a semi arid savanna west africa
    Forest Ecology and Management, 2010
    Co-Authors: Katharina Schumann, Rudiger Wittig, Adjima Thiombiano, Ute Becker, Karen Hahn
    Abstract:

    Non-timber forest products (NTFPs) strongly contribute to livelihood security in the semi-arid tropics. There is increasing concern about the population status of NTFP-providing trees and therefore a need for their sustainable Use. Thus, this study examines the impact of Land-Use Type on the multipurpose baobab tree (Adansonia digitata L.) in Burkina Faso, combined with rates and patterns of bark- and leaf-harvesting, and their impact on fruit production. We compared stands in a protected area (W National Park of Burkina Faso) with those of surrounding communal area (fallows, cropLands and villages) to obtain an indication on the status of the baobab population, to assess its harvesting tolerance and to estimate to what extent their actual Use is sustainable. Our results reveal that Land-Use Type has an impact on the population structure of the baobab. The size class distribution curve of park stands was inverse J-shape which indicates good rejuvenation, while the curve of fallows, cropLands and villages stands was bell-shaped, indicating a lack of recruitment. However, a high number of seedlings were recorded in villages. Nearly all baobabs were pruned and debarked in villages, cropLands and fallows while half of the individuals were harvested in the park. Most of the trees were pruned and debarked moderately. Debarking and pruning were slightly size specific. Pruning in interaction with tree-size had a significant impact on fruit production. In contrast, debarking had no effect on fruit production. We conclude that despite the Land-Use impact and the intense harvesting, baobabs are still well preserved in the communal area due to their longevity, extremely low adult mortality rates and traditional management practices. However, Land-Use intensifications may lead to increasing pressure on baobab populations in the future. Therefore, adapted management strategies are needed to guarantee the persistence of this important species and to avoid a shortage of baobab products.

Xiaowei Chuai - One of the best experts on this subject based on the ideXlab platform.

  • reexamine china s terrestrial ecosystem carbon balance under Land Use Type and climate change
    Land Use Policy, 2021
    Co-Authors: Xiaomin Guo, Xiaowei Chuai, Fangjian Xie, Feng Yang, Runyi Gao
    Abstract:

    Abstract Land Use and climate change can strongly affect the terrestrial ecosystem carbon balance. However, there is a lack of clarity for existing studies that investigate total carbon balance for China’s terrestrial carbon balance (carbon storage and Net Ecosystem Productivity (NEP)). In this study, based on large data and the improved NEP model, we examined Land Use and climate change during 2000–2015 in China, calculated terrestrial ecosystem carbon storage change caUsed by Land Use change, and carbon sink/source variation under climate change; we found that during 2000–2015, 3.05 % of China’s Land area had Land Use Type changes and caUsed 32.97 Tg of carbon storage loss, consisting of 10.4 Tg from vegetation carbon storage and 22.57 Tg from soil organic carbon (SOC) loss. Built-up Land occupying ecological Land was the most obvious Land transfer Type, especially for grassLand degeneration. Both temperature and precipitation showed decreasing trends throughout China. Mean annual NEP showed a carbon sink value of 41.73 g C.m−2.yr−1, and the NEPs of carbon sinks were mostly distributed in South and MidLand China and partly in Northeast China. There were obvious regional differences and the carbon balance showed that North China and Northwest China were regions of net carbon sources. The other four regions were net carbon sinks. Land Use changes caUsed carbon storage loss in all regions, NEPs in North China and Northwest China were carbon sources, while in the other regions were carbon sinks. All NEPs exhibited an increasing trend during 2000–2015, except for Mid-South China. Finally, according to regional carbon balance characters, different policy implications were drawn which can serve for the formulation of territorial spatial planning. Land exploitation should be limited and environmental conservation is needed in North and Northwest China. The temperature in Southwest China has been increasing continuously and merits attention. The control of built-up Land expansion in other regions should be strengthened.

  • impact of Land Use Type conversion on carbon storage in terrestrial ecosystems of china a spatial temporal perspective
    Scientific Reports, 2015
    Co-Authors: Mei Zhang, Xianjin Huang, Xiaowei Chuai, Hong Yang, Li Lai, Junzhong Tan
    Abstract:

    Impact of Land Use Type conversion on carbon storage in terrestrial ecosystems of China: A spatial-temporal perspective

Land Use Type - 15 days free trial to Access Experts & Abstracts