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Water Supply Changes N and P conservation in a Perennial Grass Leymus chinensis

Journal of Integrative Plant Biology 2009年第11期51卷 1050-1056页

作者： Ju-Ying Huang Hai-Long Yu Ling-Hao Li Zhi-You Yuan Samuel Barrels Center of New Technology Appfication and Research Ningxia University Yinchuan 750021 China State Key Laboratory of Vegetation and Environmental Change Institute of Botany the Chinese Academy of Sciences Beijing 100093 China College of Recourses and Environment Ningxia University Yinchuan 750021 China Faculty of Forestry and the Forest Environment Lakehead University Thunder Bay Ontario P7B 5E1 Canada

Changes in precipitation can influence soil water and nutrient availability, and thus affect plant nutrient conservation strategies. Better understanding of how nutrient conservation changes with variations in water availability is crucial for predicting the potential influence of global climate change on plant nutrient-use strategy. Here, green-leaf nitrogen （N） and phosphorus （P） concentrations, N- and P-resorption proficiency （the terminal N and P concentration in senescent leaves, NRP and PRP, respectively）, and N- and P-resorption efficiency （the proportional N and P withdrawn from senescent leaves prior to abscission, NRE and PRE, respectively） of Leymus chinensis （Trin.） Tzveh, a typical perennial grass species in northern China, were examined along a water supply gradient to explore how plant nutrient conservation responds to water change. Increasing water supply at low levels （〈 9000 mL/year） increased NRP, PRP and PRE, but decreased green-leaf N concentration. It did not significantly affect green-leaf P concentration or NRE. By contrast, all N and P conservation indicators were not significantly influenced at high water supply levels （〉 9000 mL/year）. These results indicated that changes in water availability at low levels could affect leaf-level nutrient characteristics, especially for the species in semiarid ecosystems. Therefore, global changes in precipitation may pose effects on plant nutrient economy, and thus on nutrient cycling in the plant-soil systems.

关键词： green-leaf nutrient concentration Leymus chinensis nutrient resorption nutrient conservation water supply gradient.

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Effects of defoliation timing on plant nutrient resorption and hay production in a semi-arid steppe

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Journal of Plant Ecology 2021年第1期14卷 44-57页

作者： Tongrui Zhang Frank Yonghong Li Hao Wang Lin Wu Chunjun Shi Yanlong Li Jie Hu Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau&Inner Mongolia Key Laboratory of Grassland Ecology School of Ecology and EnvironmentInner Mongolia UniversityHohhot 010021China

Aims nutrient resorption is a key plant nutrient conservation strategy,and its response to environmental and management changes is linked to nutrient cycling and production of *** is a major pathway of mowing affecting plant nutrient resorption and production in grasslands,while the effect of defoliation timing has not been *** aim of this study was to examine the effect of defoliation timing on plant nutrient resorption and production in a steppe *** We conducted a field experiment in a semi-arid steppe of Inner Mongolia including four treatments:early defoliation,peak defoliation,late defoliation and *** measured plant nitrogen(N)and phosphorus(P)resorption at species and community levels,and quantified plant N and P fluxes in resorption,litter return and hay *** production in the mowing system was assessed by hay production and *** Findings Peak and late defoliation,but not early defoliation,reduced plant community N and P resorption proficiency;and late defoliation reduced N resorption efficiency but not P resorption *** and late defoliation,but not early defoliation,reduced plant nutrient resorption flux and litter nutrient return *** timing did not alter root nutrient accumulation as nutrient uptake from soil likely compensated the deficit of nutrient *** defoliation had the highest hay production and quality,while early defoliation had the *** results provide new insights into the nutrient cycling in mowing grassland,and imply that the mowing timing can be used as a tool to mediate the balanee between conservation and production of steppes,and the early mowing before plant peak biomass period is recommended for conservation of the steppes while keeping sustainable pastoral production.

关键词： defoliation timing nutrient resorption hay production nutrient conservation mowing temperate steppe

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