The Experts below are selected from a list of 24555 Experts worldwide ranked by ideXlab platform
Lei Deng - One of the best experts on this subject based on the ideXlab platform.
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variations in Soil Aggregate stability due to land use changes from agricultural land on the loess plateau china
Catena, 2021Co-Authors: Guangyu Zhu, Zhouping Shangguan, Lei DengAbstract:Abstract Soil Aggregate stability is a feasible and effective factor to understand the complex interactions between physicochemical properties and Soil structure. To reveal the distributions of Soil Aggregate stability and its influential factors following land use change from apple orchards abandonment and development in the Nangou watershed of the Loess Plateau, China, this study selected five ages of apple orchards and their planting years were 1 year, 3 years, 6 years, 8 years and 10 years, one 15-year grassland developed from an apple orchard, one 15- year grassland developed from farmland, one natural grassland and one 15-year locust. Results showed that restored vegetation had better Soil Aggregate stability, Soil organic carbon (SOC), and nitrogen (N) than apple orchards, and the composition of Soil particles with the best Aggregate stability was clay 6%, silt 8%, and sand 86%. At a 0–10 cm Soil depth, Soil Aggregate stability had a significant positive correlation with SOC and Soil total nitrogen (STN), and a negative correlation with NO3− and NH4+. In addition, vegetation diversity and coverage only affected the Soil Aggregate stability of the 0–10 cm Soil depth; however, Soil pH, bulk density, and Soil Aggregate-associated inorganic nitrogen were the main influential factors that drove the Soil Aggregate stability of the 0–30 cm Soil depth. Further research discovered that macro-Aggregate associated NO3− and micro-Aggregate associated NH4+ may be the key factors affecting the Soil Aggregate stability. Therefore, it is essential to further explore the effect of Soil Aggregate-associated inorganic nitrogen on Soil Aggregate stability.
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effects of Soil Aggregate stability on Soil n following land use changes under erodible environment
Agriculture Ecosystems & Environment, 2018Co-Authors: Guangyu Zhu, Zhouping Shangguan, Lei DengAbstract:Abstract Soil nitrogen (N) dynamics have considerable effects on the terrestrial carbon cycle, and land use changes could affect Soil N through impacts on Soil Aggregate stability. This study selected nine sites including apple orchards of different ages and restored sites to explore the effects of Soil Aggregate stability on Soil total N (STN), ammonium N (AN), and nitrate N (NN) following different stages of apple orchard on the Loess Plateau of China. The results showed that when compared with apple orchard sites, the restored sites had higher contents of STN and lower contents of AN and NN, but when compared with restored sites, inorganic-N storage played a more important role in the apple orchards. Following different stages of apple orchards, the STN, AN and NN contents and mean weight diameter (MWD) of Soil Aggregates were all improved. MWD had a negative effect on inorganic-N content at 10–30 cm Soil depths but had a positive relationship with Soil N at 0–10 cm Soil depth. In addition, planting apple orchards destroyed Soil Aggregate stability in this erodible environment, but it could be restored soon after abandonment. Therefore, considering Soil N and Soil Aggregate stability, it is feasible to plant apple trees in this area and we propose that the effects of trade-offs between Soil Aggregate stability and Soil erosion on Soil N in terraced agroecosystems should be a focus of future research.
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Soil Aggregate stability and Aggregate associated carbon and nitrogen in natural restoration grassland and chinese red pine plantation on the loess plateau
Catena, 2017Co-Authors: Zhouping Shangguan, Lei DengAbstract:Abstract Artificial afforestation and natural recovery from abandoned cropland are two typical recovery types on the Loess Plateau, China. However, few studies have investigated the difference of natural secondary vegetation restoration and man-made plantation in Soil Aggregate physicochemical properties and Soil Aggregate stability. Therefore, we have selected natural restoration grassland and Chinese red pine plantation to study the differences of Soil Aggregate size distributions, Aggregate carbon (C) and nitrogen (N) distributions, Soil Aggregate stability index (fractal dimension, D; mean weight diameter, MWD; geometric mean diameter, GMD; percentage of aggregation destruction, PAD) as well as their relationships. The results showed that after ~ 15 years restoration from abandoned cropland, natural restoration grassland had higher Soil organic carbon (SOC), total nitrogen (TN), ammonium nitrogen (AN), microbial biomass nitrogen (MBN) and MWD compared to Chinese red pine forest, but Chinese red pine forest had higher Aggregate C and N, D, GMD and PAD. In addition, SOC positively correlated with MWD in natural restoration grassland but opposite in Chinese red pine forest. In detail, the differences of Soil general properties and Aggregate size fraction percentages between two land use types were found mainly in 2–5 mm, 1–2 mm, 0.25 mm and clay water-stable Aggregate size fractions. The results suggested that higher C content would further contribute the Soil Aggregate stability in natural restoration grassland, and higher N content would be more important in Chinese red pine plantation.
Rong Xiao - One of the best experts on this subject based on the ideXlab platform.
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heavy metal distribution in different Soil Aggregate size classes from restored brackish marsh oil exploitation zone and tidal mud flat of the yellow river delta
Journal of Soils and Sediments, 2016Co-Authors: Rong Xiao, Mingxiang Zhang, Feihai YuAbstract:Purpose Heavy metal distribution in Soils is affected by Soil Aggregate fractionation. This study aimed to demons trate the Aggregate-associated heavy metal concentrations and fractionations in “sandy,” “normal,” and “mud” Soils from the restored brackish tidal marsh, oil exploitation zone, and tidal mudflat of the Yellow River Delta (YRD), China.
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heavy metal distribution in different Soil Aggregate size classes from restored brackish marsh oil exploitation zone and tidal mud flat of the yellow river delta
Journal of Soils and Sediments, 2016Co-Authors: Rong Xiao, Mingxiang Zhang, Xinying Yao, Junhong BaiAbstract:Heavy metal distribution in Soils is affected by Soil Aggregate fractionation. This study aimed to demons trate the Aggregate-associated heavy metal concentrations and fractionations in “sandy,” “normal,” and “mud” Soils from the restored brackish tidal marsh, oil exploitation zone, and tidal mudflat of the Yellow River Delta (YRD), China. Soil samples were sieved into the Aggregates of >2, 0.25–2, 0.053–0.25, and 2 mm Aggregates indicated contribution of carbonates to Soil aggregation and metal adsorption in tidal mud flat. Soil type and Aggregate distribution were important factors controlling heavy metal concentration and fractionation in YRD wetland Soil. Compared with mud Soil, normal Soil contained increased concentrations of F5 and F3 of metals in the 0.053–0.25 mm Aggregate, and sandy Soil contained increased concentrations of bioavailable and total Cr, Ni, and Zn with great contribution of mass loadings in the <0.053 mm Aggregate. The results of this study suggested that oil exploitation and wetland restoration activities may influence the retention characteristics of heavy metals in tidal Soils through variation of Soil type and Aggregate fractions.
Zhouping Shangguan - One of the best experts on this subject based on the ideXlab platform.
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variations in Soil Aggregate stability due to land use changes from agricultural land on the loess plateau china
Catena, 2021Co-Authors: Guangyu Zhu, Zhouping Shangguan, Lei DengAbstract:Abstract Soil Aggregate stability is a feasible and effective factor to understand the complex interactions between physicochemical properties and Soil structure. To reveal the distributions of Soil Aggregate stability and its influential factors following land use change from apple orchards abandonment and development in the Nangou watershed of the Loess Plateau, China, this study selected five ages of apple orchards and their planting years were 1 year, 3 years, 6 years, 8 years and 10 years, one 15-year grassland developed from an apple orchard, one 15- year grassland developed from farmland, one natural grassland and one 15-year locust. Results showed that restored vegetation had better Soil Aggregate stability, Soil organic carbon (SOC), and nitrogen (N) than apple orchards, and the composition of Soil particles with the best Aggregate stability was clay 6%, silt 8%, and sand 86%. At a 0–10 cm Soil depth, Soil Aggregate stability had a significant positive correlation with SOC and Soil total nitrogen (STN), and a negative correlation with NO3− and NH4+. In addition, vegetation diversity and coverage only affected the Soil Aggregate stability of the 0–10 cm Soil depth; however, Soil pH, bulk density, and Soil Aggregate-associated inorganic nitrogen were the main influential factors that drove the Soil Aggregate stability of the 0–30 cm Soil depth. Further research discovered that macro-Aggregate associated NO3− and micro-Aggregate associated NH4+ may be the key factors affecting the Soil Aggregate stability. Therefore, it is essential to further explore the effect of Soil Aggregate-associated inorganic nitrogen on Soil Aggregate stability.
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effects of Soil Aggregate stability on Soil n following land use changes under erodible environment
Agriculture Ecosystems & Environment, 2018Co-Authors: Guangyu Zhu, Zhouping Shangguan, Lei DengAbstract:Abstract Soil nitrogen (N) dynamics have considerable effects on the terrestrial carbon cycle, and land use changes could affect Soil N through impacts on Soil Aggregate stability. This study selected nine sites including apple orchards of different ages and restored sites to explore the effects of Soil Aggregate stability on Soil total N (STN), ammonium N (AN), and nitrate N (NN) following different stages of apple orchard on the Loess Plateau of China. The results showed that when compared with apple orchard sites, the restored sites had higher contents of STN and lower contents of AN and NN, but when compared with restored sites, inorganic-N storage played a more important role in the apple orchards. Following different stages of apple orchards, the STN, AN and NN contents and mean weight diameter (MWD) of Soil Aggregates were all improved. MWD had a negative effect on inorganic-N content at 10–30 cm Soil depths but had a positive relationship with Soil N at 0–10 cm Soil depth. In addition, planting apple orchards destroyed Soil Aggregate stability in this erodible environment, but it could be restored soon after abandonment. Therefore, considering Soil N and Soil Aggregate stability, it is feasible to plant apple trees in this area and we propose that the effects of trade-offs between Soil Aggregate stability and Soil erosion on Soil N in terraced agroecosystems should be a focus of future research.
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Soil Aggregate stability and Aggregate associated carbon and nitrogen in natural restoration grassland and chinese red pine plantation on the loess plateau
Catena, 2017Co-Authors: Zhouping Shangguan, Lei DengAbstract:Abstract Artificial afforestation and natural recovery from abandoned cropland are two typical recovery types on the Loess Plateau, China. However, few studies have investigated the difference of natural secondary vegetation restoration and man-made plantation in Soil Aggregate physicochemical properties and Soil Aggregate stability. Therefore, we have selected natural restoration grassland and Chinese red pine plantation to study the differences of Soil Aggregate size distributions, Aggregate carbon (C) and nitrogen (N) distributions, Soil Aggregate stability index (fractal dimension, D; mean weight diameter, MWD; geometric mean diameter, GMD; percentage of aggregation destruction, PAD) as well as their relationships. The results showed that after ~ 15 years restoration from abandoned cropland, natural restoration grassland had higher Soil organic carbon (SOC), total nitrogen (TN), ammonium nitrogen (AN), microbial biomass nitrogen (MBN) and MWD compared to Chinese red pine forest, but Chinese red pine forest had higher Aggregate C and N, D, GMD and PAD. In addition, SOC positively correlated with MWD in natural restoration grassland but opposite in Chinese red pine forest. In detail, the differences of Soil general properties and Aggregate size fraction percentages between two land use types were found mainly in 2–5 mm, 1–2 mm, 0.25 mm and clay water-stable Aggregate size fractions. The results suggested that higher C content would further contribute the Soil Aggregate stability in natural restoration grassland, and higher N content would be more important in Chinese red pine plantation.
Feihai Yu - One of the best experts on this subject based on the ideXlab platform.
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heavy metal distribution in different Soil Aggregate size classes from restored brackish marsh oil exploitation zone and tidal mud flat of the yellow river delta
Journal of Soils and Sediments, 2016Co-Authors: Rong Xiao, Mingxiang Zhang, Feihai YuAbstract:Purpose Heavy metal distribution in Soils is affected by Soil Aggregate fractionation. This study aimed to demons trate the Aggregate-associated heavy metal concentrations and fractionations in “sandy,” “normal,” and “mud” Soils from the restored brackish tidal marsh, oil exploitation zone, and tidal mudflat of the Yellow River Delta (YRD), China.
Junhong Bai - One of the best experts on this subject based on the ideXlab platform.
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heavy metal distribution in different Soil Aggregate size classes from restored brackish marsh oil exploitation zone and tidal mud flat of the yellow river delta
Journal of Soils and Sediments, 2016Co-Authors: Rong Xiao, Mingxiang Zhang, Xinying Yao, Junhong BaiAbstract:Heavy metal distribution in Soils is affected by Soil Aggregate fractionation. This study aimed to demons trate the Aggregate-associated heavy metal concentrations and fractionations in “sandy,” “normal,” and “mud” Soils from the restored brackish tidal marsh, oil exploitation zone, and tidal mudflat of the Yellow River Delta (YRD), China. Soil samples were sieved into the Aggregates of >2, 0.25–2, 0.053–0.25, and 2 mm Aggregates indicated contribution of carbonates to Soil aggregation and metal adsorption in tidal mud flat. Soil type and Aggregate distribution were important factors controlling heavy metal concentration and fractionation in YRD wetland Soil. Compared with mud Soil, normal Soil contained increased concentrations of F5 and F3 of metals in the 0.053–0.25 mm Aggregate, and sandy Soil contained increased concentrations of bioavailable and total Cr, Ni, and Zn with great contribution of mass loadings in the <0.053 mm Aggregate. The results of this study suggested that oil exploitation and wetland restoration activities may influence the retention characteristics of heavy metals in tidal Soils through variation of Soil type and Aggregate fractions.
