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Yinglong Chen - One of the best experts on this subject based on the ideXlab platform.
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Soil moisture availability at early growth stages strongly affected root growth of bothriochloa ischaemum when mixed with lespedeza davurica
Frontiers in Plant Science, 2018Co-Authors: Yinglong Chen, Zhifei Chen, Zhi Wang, Zhao Jia, Jin Huang, Zhongming WenAbstract:Rainfall is the main resource of Soil moisture in the semiarid areas, and the altered rainfall pattern would greatly affect plant growth and development. Root morphological traits are critical for plant adaptation to changeable Soil moisture. This study aimed to clarify how root morphological traits of Bothriochloa ischaemum (a C4 herbaceous species) and Lespedeza davurica (a C3 leguminous species) in response to variable Soil moisture in their mixtures. The two species were co-cultivated in pots at seven mixture ratios under three Soil Water Regimes [80% (HW), 60% (MW), and 40% (LW) of Soil moisture field capacity (FC)]. At the jointing, flowering, and filling stages of B. ischaemum, the LW and MW treatments were reWatered to MW or HW, respectively. At the end of growth season, root morphological traits of two species were evaluated. Results showed that the root morphological response of B. ischaemum was more sensitive than that of L. davurica under reWatering. The total root length (TRL) and root surface area (RSA) of both species increased as their mixture ratio decreased, which suggested that mixed plantation of the two species would be beneficial for their own root growth. Among all treatments, the increase of root biomass (RB), TRL, and RSA reached the highest levels when Soil Water content increased from 40 to 80% FC at the jointing stage. Our results implied that species-specific response in root morphological traits to alternated rainfall pattern would greatly affect community structure, and large rainfall occurring at early growth stages would greatly increase their root growth in the semiarid environments.
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Presentation_1_Soil Moisture Availability at Early Growth Stages Strongly Affected Root Growth of Bothriochloa ischaemum When Mixed With Lespedeza davurica.PDF
2018Co-Authors: Zhi Wang, Zhifei Chen, Zhao Jia, Jin Huang, Zhongming Wen, Yinglong ChenAbstract:Rainfall is the main resource of Soil moisture in the semiarid areas, and the altered rainfall pattern would greatly affect plant growth and development. Root morphological traits are critical for plant adaptation to changeable Soil moisture. This study aimed to clarify how root morphological traits of Bothriochloa ischaemum (a C4 herbaceous species) and Lespedeza davurica (a C3 leguminous species) in response to variable Soil moisture in their mixtures. The two species were co-cultivated in pots at seven mixture ratios under three Soil Water Regimes [80% (HW), 60% (MW), and 40% (LW) of Soil moisture field capacity (FC)]. At the jointing, flowering, and filling stages of B. ischaemum, the LW and MW treatments were reWatered to MW or HW, respectively. At the end of growth season, root morphological traits of two species were evaluated. Results showed that the root morphological response of B. ischaemum was more sensitive than that of L. davurica under reWatering. The total root length (TRL) and root surface area (RSA) of both species increased as their mixture ratio decreased, which suggested that mixed plantation of the two species would be beneficial for their own root growth. Among all treatments, the increase of root biomass (RB), TRL, and RSA reached the highest levels when Soil Water content increased from 40 to 80% FC at the jointing stage. Our results implied that species-specific response in root morphological traits to alternated rainfall pattern would greatly affect community structure, and large rainfall occurring at early growth stages would greatly increase their root growth in the semiarid environments.
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n p ratio of the grass bothriochloa ischaemum mixed with the legume lespedeza davurica under varying Water and fertilizer supplies
Plant and Soil, 2016Co-Authors: Zhijuan Gao, Jing Wang, Jairo A Palta, Yinglong ChenAbstract:Plant growth and ecosystem processes in semiarid regions are limited by Soil nutrient and Water availability. Nitrogen (N) and phosphorus (P) status and the N:P ratio alterations among plant organs are critical in understanding the physiology and productivity of the grass-legume mixture system. This study aimed to identify the N and P distribution patterns and N:P stoichiometry of a local grass species mixed with a legume species under varying Water and fertilizer supplies. A C4 perennial herbaceous grass Bothriochloa ischaemum and a C3 perennial leguminous subshrub Lespedeza davurica were grown in a pot experiment with a randomized complete block design consisting of four fertilizations (non-NP, +N, +P and +NP fertilizers), three Soil Water Regimes (80, 60 and 40 % of Soil Water field capacity, FC) and six planting ratios (2:10, 4:8, 6:6, 8:4, 10:2, and 12:0, grass:legume plants, respectively). Plants were assessed for biomass production, N and P concentration and N:P ratios in various organs 202 days after sowing (DAS). For the grass species (B. ischaemum), N and P concentrations of leaf, stem and root were higher when mixed with the legume (L. davurica) compared to its monoculture, and with a trend to decrease as its mixture proportion increased. Supply with P fertilizer (+P) increased N and P concentrations of B. ischaemum regardless of mixture proportions and Soil Water Regimes. In mixtures, N concentration was the highest in the root system followed by the leaf, and the least in the stem. There was no significant difference in N:P ratio of the stem and the root across the mixture proportions under +P and +NP treatments, and among all Soil Water Regimes, either. Root N:P ratio was significantly lower under +P and +NP than that under non-NP or +N treatment regardless of mixture proportions and Soil Water Regimes. N and P capture and absorption in B. ischaemum were greatly improved when mixed with the legume species, L. davurica. The N and P concentrations in different organs were influenced by both fertilization and the mixture proportions. Application with combined N and P fertilizers enhanced N and P uptake in B. ischaemum. P fertilization should be considered when establishing artificial grassland using native species in the region.
Guangyou Hao - One of the best experts on this subject based on the ideXlab platform.
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hydraulic dysfunction due to root exposure initiated Water stress is responsible for the mortality of salix gordejevii shrubs on the windward slopes of active sand dunes
Plant and Soil, 2021Co-Authors: Xuewei Gong, Guillermo Goldstein, Jingjing Guo, Lidong Fang, Sandra Janet Bucci, Guangyou HaoAbstract:Sand-fixing shrub Salix gordejevii plays an important role in sand dune stabilization but often shows severe decline and mortality on the windward slopes of active dunes. The objective of this study was to explore the environmental drivers and physiological mechanisms behind its decline and mortality on the windward slopes of active sand dunes. The xylem hydraulics, sap flow, Water relations and non-structural carbohydrate reserves were measured for S. gordejevii plants that respectively inhabited interdune, leeward and windward positions of active dunes with contrasting Soil Water Regimes. Root exposure caused by wind erosion, rather than low Soil moisture, predisposed windward S. gordejevii plants to stronger Water stress. Correspondingly, the windward plants showed reduced transpirational Water use and exhibited a suite of acclimative adjustments in leaf traits favoring Water conservation. Despite these adjustments, windward S. gordejevii plants still suffered from higher risks of hydraulic failure and branch mortality. No evidence of carbon depletion in windward S. gordejevii plants was found although the soluble sugar to starch ratios changed significantly. Our findings suggest that wind-erosion-induced root exposure triggers Water stress and eventually causes the mortality of windward S. gordejevii plants, during which increased risk of hydraulic dysfunction is pronounced.
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contrasts in xylem hydraulics and Water use underlie the sorting of different sand fixing shrub species to early and late stages of dune stabilization
Forest Ecology and Management, 2020Co-Authors: Xuewei Gong, Guillermo Goldstein, Jingjing Guo, Deming Jiang, Fabian G Scholz, Sandra J Bucci, Guangyou HaoAbstract:Abstract Dominating sand-fixing shrubs play crucial roles in the stabilization and rehabilitation of sand dunes. Different sand-fixing shrub species often separate along the temporal-spatial environmental gradient during the sand dune stabilization process; however, the physiological mechanisms underlying such a separation remain poorly understood, which limits our ability to identify the causes of land desertification and the cruxes of rehabilitation. We investigated xylem hydraulics and Water use characteristics of four important shrub species used for sand dune fixation projects in northern China that show distinct preferences to different stages of dune stabilization, i.e. two species succeed in active dunes and the other two in fixed dunes. The major aim was to examine the roles of xylem hydraulics, Water use and the coordination of these two aspects in determining the habitat preferences of sand-fixing shrubs along the process of dune stabilization in Water-limited environments. The two active-dune species consistently exhibited higher stem hydraulic conductivity but lower resistance to drought-induced xylem embolism than the two fixed-dune species, which reflects contrasting requirements to shrub hydraulic functionality in sand dunes of the two successional stages that differ substantially in Soil Water Regimes. In coordination with contrasts in hydraulics, they also diverged clearly in Water use strategies with the fixed-dune shrubs showing more conservative Water use. Our results highlight the critical roles that hydraulics and Water utilization play in determining the adaptation of dominating sand-fixing shrub species to their respective environments shaped by the plant-Soil interactions during sand dune vegetation development.
Guillermo Goldstein - One of the best experts on this subject based on the ideXlab platform.
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hydraulic dysfunction due to root exposure initiated Water stress is responsible for the mortality of salix gordejevii shrubs on the windward slopes of active sand dunes
Plant and Soil, 2021Co-Authors: Xuewei Gong, Guillermo Goldstein, Jingjing Guo, Lidong Fang, Sandra Janet Bucci, Guangyou HaoAbstract:Sand-fixing shrub Salix gordejevii plays an important role in sand dune stabilization but often shows severe decline and mortality on the windward slopes of active dunes. The objective of this study was to explore the environmental drivers and physiological mechanisms behind its decline and mortality on the windward slopes of active sand dunes. The xylem hydraulics, sap flow, Water relations and non-structural carbohydrate reserves were measured for S. gordejevii plants that respectively inhabited interdune, leeward and windward positions of active dunes with contrasting Soil Water Regimes. Root exposure caused by wind erosion, rather than low Soil moisture, predisposed windward S. gordejevii plants to stronger Water stress. Correspondingly, the windward plants showed reduced transpirational Water use and exhibited a suite of acclimative adjustments in leaf traits favoring Water conservation. Despite these adjustments, windward S. gordejevii plants still suffered from higher risks of hydraulic failure and branch mortality. No evidence of carbon depletion in windward S. gordejevii plants was found although the soluble sugar to starch ratios changed significantly. Our findings suggest that wind-erosion-induced root exposure triggers Water stress and eventually causes the mortality of windward S. gordejevii plants, during which increased risk of hydraulic dysfunction is pronounced.
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contrasts in xylem hydraulics and Water use underlie the sorting of different sand fixing shrub species to early and late stages of dune stabilization
Forest Ecology and Management, 2020Co-Authors: Xuewei Gong, Guillermo Goldstein, Jingjing Guo, Deming Jiang, Fabian G Scholz, Sandra J Bucci, Guangyou HaoAbstract:Abstract Dominating sand-fixing shrubs play crucial roles in the stabilization and rehabilitation of sand dunes. Different sand-fixing shrub species often separate along the temporal-spatial environmental gradient during the sand dune stabilization process; however, the physiological mechanisms underlying such a separation remain poorly understood, which limits our ability to identify the causes of land desertification and the cruxes of rehabilitation. We investigated xylem hydraulics and Water use characteristics of four important shrub species used for sand dune fixation projects in northern China that show distinct preferences to different stages of dune stabilization, i.e. two species succeed in active dunes and the other two in fixed dunes. The major aim was to examine the roles of xylem hydraulics, Water use and the coordination of these two aspects in determining the habitat preferences of sand-fixing shrubs along the process of dune stabilization in Water-limited environments. The two active-dune species consistently exhibited higher stem hydraulic conductivity but lower resistance to drought-induced xylem embolism than the two fixed-dune species, which reflects contrasting requirements to shrub hydraulic functionality in sand dunes of the two successional stages that differ substantially in Soil Water Regimes. In coordination with contrasts in hydraulics, they also diverged clearly in Water use strategies with the fixed-dune shrubs showing more conservative Water use. Our results highlight the critical roles that hydraulics and Water utilization play in determining the adaptation of dominating sand-fixing shrub species to their respective environments shaped by the plant-Soil interactions during sand dune vegetation development.
Zhi Wang - One of the best experts on this subject based on the ideXlab platform.
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Soil moisture availability at early growth stages strongly affected root growth of bothriochloa ischaemum when mixed with lespedeza davurica
Frontiers in Plant Science, 2018Co-Authors: Yinglong Chen, Zhifei Chen, Zhi Wang, Zhao Jia, Jin Huang, Zhongming WenAbstract:Rainfall is the main resource of Soil moisture in the semiarid areas, and the altered rainfall pattern would greatly affect plant growth and development. Root morphological traits are critical for plant adaptation to changeable Soil moisture. This study aimed to clarify how root morphological traits of Bothriochloa ischaemum (a C4 herbaceous species) and Lespedeza davurica (a C3 leguminous species) in response to variable Soil moisture in their mixtures. The two species were co-cultivated in pots at seven mixture ratios under three Soil Water Regimes [80% (HW), 60% (MW), and 40% (LW) of Soil moisture field capacity (FC)]. At the jointing, flowering, and filling stages of B. ischaemum, the LW and MW treatments were reWatered to MW or HW, respectively. At the end of growth season, root morphological traits of two species were evaluated. Results showed that the root morphological response of B. ischaemum was more sensitive than that of L. davurica under reWatering. The total root length (TRL) and root surface area (RSA) of both species increased as their mixture ratio decreased, which suggested that mixed plantation of the two species would be beneficial for their own root growth. Among all treatments, the increase of root biomass (RB), TRL, and RSA reached the highest levels when Soil Water content increased from 40 to 80% FC at the jointing stage. Our results implied that species-specific response in root morphological traits to alternated rainfall pattern would greatly affect community structure, and large rainfall occurring at early growth stages would greatly increase their root growth in the semiarid environments.
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abscisic acid and brassinolide combined application synergistically enhances drought tolerance and photosynthesis of tall fescue under Water stress
Scientia Horticulturae, 2018Co-Authors: Zhifei Chen, Zhi Wang, Yungui YangAbstract:Abstract Tall fescue ( Festuca arundinacea Schreb.) is a widely used cool-season turfgrass, and its growth is mainly limited by Water deficit. Abscisic acid (ABA) and brassinolide (BR) are two important stress hormones regulating plant physiological processes and growth under Water deficit. To investigate effects of exogenous ABA and BR on physiological and photosynthetic performance of tall fescue under Water stress conditions, ABA (10 and 20 mg L −1 ) and BR (0.4 and 0.8 mg L −1 ) were applied individually and in combination (0.4 mg L −1 BR and 10 mg L −1 ABA) under three Soil Water Regimes [75 ± 5% FC (HW), 50 ± 5% FC (MW) and 25 ± 5% FC (LW)] in the greenhouse. Results revealed that ABA and BR application markedly decreased the relative conductivity and malondialdehyde, notably increased leaf relative Water content, antioxidant enzyme activity and proline content under Water stress. ABA plus BR application was equally effective in improving the activities of antioxidant enzyme as ABA at 20 mg L −1 . ABA application reduced stomatal conductance and decreased both transpiration and net photosynthetic rate ( P n ), while BR application significantly increased P n and Water use efficiency (WUE) by enhancing chlorophyll content. The ABA and BR combination application showed higher P n and WUE as well as BR single application. It indicated that ABA and BR combination application increased photosynthetic capacity, and reduced the effect on photosynthetic loss caused by ABA under Water stress. All these confirmed that ABA plus BR application exhibited a synergistic interaction on enhancing drought tolerance and photosynthesis of tall fescue under Water stress.
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Presentation_1_Soil Moisture Availability at Early Growth Stages Strongly Affected Root Growth of Bothriochloa ischaemum When Mixed With Lespedeza davurica.PDF
2018Co-Authors: Zhi Wang, Zhifei Chen, Zhao Jia, Jin Huang, Zhongming Wen, Yinglong ChenAbstract:Rainfall is the main resource of Soil moisture in the semiarid areas, and the altered rainfall pattern would greatly affect plant growth and development. Root morphological traits are critical for plant adaptation to changeable Soil moisture. This study aimed to clarify how root morphological traits of Bothriochloa ischaemum (a C4 herbaceous species) and Lespedeza davurica (a C3 leguminous species) in response to variable Soil moisture in their mixtures. The two species were co-cultivated in pots at seven mixture ratios under three Soil Water Regimes [80% (HW), 60% (MW), and 40% (LW) of Soil moisture field capacity (FC)]. At the jointing, flowering, and filling stages of B. ischaemum, the LW and MW treatments were reWatered to MW or HW, respectively. At the end of growth season, root morphological traits of two species were evaluated. Results showed that the root morphological response of B. ischaemum was more sensitive than that of L. davurica under reWatering. The total root length (TRL) and root surface area (RSA) of both species increased as their mixture ratio decreased, which suggested that mixed plantation of the two species would be beneficial for their own root growth. Among all treatments, the increase of root biomass (RB), TRL, and RSA reached the highest levels when Soil Water content increased from 40 to 80% FC at the jointing stage. Our results implied that species-specific response in root morphological traits to alternated rainfall pattern would greatly affect community structure, and large rainfall occurring at early growth stages would greatly increase their root growth in the semiarid environments.
Xuewei Gong - One of the best experts on this subject based on the ideXlab platform.
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hydraulic dysfunction due to root exposure initiated Water stress is responsible for the mortality of salix gordejevii shrubs on the windward slopes of active sand dunes
Plant and Soil, 2021Co-Authors: Xuewei Gong, Guillermo Goldstein, Jingjing Guo, Lidong Fang, Sandra Janet Bucci, Guangyou HaoAbstract:Sand-fixing shrub Salix gordejevii plays an important role in sand dune stabilization but often shows severe decline and mortality on the windward slopes of active dunes. The objective of this study was to explore the environmental drivers and physiological mechanisms behind its decline and mortality on the windward slopes of active sand dunes. The xylem hydraulics, sap flow, Water relations and non-structural carbohydrate reserves were measured for S. gordejevii plants that respectively inhabited interdune, leeward and windward positions of active dunes with contrasting Soil Water Regimes. Root exposure caused by wind erosion, rather than low Soil moisture, predisposed windward S. gordejevii plants to stronger Water stress. Correspondingly, the windward plants showed reduced transpirational Water use and exhibited a suite of acclimative adjustments in leaf traits favoring Water conservation. Despite these adjustments, windward S. gordejevii plants still suffered from higher risks of hydraulic failure and branch mortality. No evidence of carbon depletion in windward S. gordejevii plants was found although the soluble sugar to starch ratios changed significantly. Our findings suggest that wind-erosion-induced root exposure triggers Water stress and eventually causes the mortality of windward S. gordejevii plants, during which increased risk of hydraulic dysfunction is pronounced.
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contrasts in xylem hydraulics and Water use underlie the sorting of different sand fixing shrub species to early and late stages of dune stabilization
Forest Ecology and Management, 2020Co-Authors: Xuewei Gong, Guillermo Goldstein, Jingjing Guo, Deming Jiang, Fabian G Scholz, Sandra J Bucci, Guangyou HaoAbstract:Abstract Dominating sand-fixing shrubs play crucial roles in the stabilization and rehabilitation of sand dunes. Different sand-fixing shrub species often separate along the temporal-spatial environmental gradient during the sand dune stabilization process; however, the physiological mechanisms underlying such a separation remain poorly understood, which limits our ability to identify the causes of land desertification and the cruxes of rehabilitation. We investigated xylem hydraulics and Water use characteristics of four important shrub species used for sand dune fixation projects in northern China that show distinct preferences to different stages of dune stabilization, i.e. two species succeed in active dunes and the other two in fixed dunes. The major aim was to examine the roles of xylem hydraulics, Water use and the coordination of these two aspects in determining the habitat preferences of sand-fixing shrubs along the process of dune stabilization in Water-limited environments. The two active-dune species consistently exhibited higher stem hydraulic conductivity but lower resistance to drought-induced xylem embolism than the two fixed-dune species, which reflects contrasting requirements to shrub hydraulic functionality in sand dunes of the two successional stages that differ substantially in Soil Water Regimes. In coordination with contrasts in hydraulics, they also diverged clearly in Water use strategies with the fixed-dune shrubs showing more conservative Water use. Our results highlight the critical roles that hydraulics and Water utilization play in determining the adaptation of dominating sand-fixing shrub species to their respective environments shaped by the plant-Soil interactions during sand dune vegetation development.