Linking nutrient strategies with plant size along a grazing gradient：Evidence fromLeymus chinensis in a natural pasture

LI Xi-liang; LIU Zhi-ying; REN Wei-bo; DING Yong; JI Lei; GUO Feng-hui; HOU Xiang-yang

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Linking nutrient strategies with plant size along a grazing gradient：Evidence fromLeymus chinensis in a natural pasture

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Studying the changes in nutrient use strategies induced by grazing can provide insight into the process of grassland degra-dation and is important for improving grassland quality and enhancing ecosystem function. Dominant species in meadow steppe can optimize their use of limiting resources; however, the regulation of nutrient use strategies across grazing gradients is not fuly understood. Therefore, in this study, we report anin situ study in which the impact of grazing rates on nutrient use strategies ofLeymus chinensis, the dominant plant species in eastern Eurasian temperate steppes, was investigated. We conducted a large randomized controled experiment (conducted continuously for ifve years in grassland plots in a natural pasture in Hailar, eastern Mongolia Plateau, China) to assess the effects of grazing rate treatments (0.00, 0.23, 0.34, 0.46, 0.69, and 0.92 adult cattle unit (AU) ha–1) onL. chinensis along a grazing gradient and employed a random sampling approach to compare the accumulation, alocation, and stoichiometry of C, N, and P in leaves and stems. Our ifndings demonstrated the folows: (i) The height ofL. chinensis decreased with an increase in the grazing gradient, and the concentrations of C, N, and P signiifcantly increased; (i) the accumulation of C, N, and P per individual was negatively correlated with the con-centration of aboveground tissues, suggesting that there was a tradeoff inL. chinensis between nutrient accumulation and concentration at the individual scale; (ii) the leaf-to-stem ratio of C, N, and P accumulation increased with grazing intensity, indicating a tradeoff in nutrient alocation and plant size at the individual plant level; and (iv) grazing rates were negatively correlated with the ratios of C:N and C:P in the stem; however, these ratios in leaves signiifcantly increased with grazing intensity. Our ifndings suggest thatL. chinensisin meadow steppe adapts to grazing disturbance through tradeoffs between plant size and nutrient use strategies. Moreover, our results imply that grazing produces a compensatory effect on nutrient use efifciency between the stems and leaves ofL. chinensis.

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《农业科学学报（英文版）》 |2016年第5期|1132-1144|共13页
作者
LI Xi-liang; LIU Zhi-ying; REN Wei-bo; DING Yong; JI Lei; GUO Feng-hui; HOU Xiang-yang;
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National Forage Improvement Center/Key Laboratory of Grassland Resources and Utilization,Ministry of Agriculture/Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot 010010, P.R.China;

National Forage Improvement Center/Key Laboratory of Grassland Resources and Utilization,Ministry of Agriculture/Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot 010010, P.R.China;

National Forage Improvement Center/Key Laboratory of Grassland Resources and Utilization,Ministry of Agriculture/Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot 010010, P.R.China;

National Forage Improvement Center/Key Laboratory of Grassland Resources and Utilization,Ministry of Agriculture/Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot 010010, P.R.China;

National Forage Improvement Center/Key Laboratory of Grassland Resources and Utilization,Ministry of Agriculture/Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot 010010, P.R.China;

National Forage Improvement Center/Key Laboratory of Grassland Resources and Utilization,Ministry of Agriculture/Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot 010010, P.R.China;

National Forage Improvement Center/Key Laboratory of Grassland Resources and Utilization,Ministry of Agriculture/Institute of Grassland Research, Chinese Academy of Agricultural Sciences, Hohhot 010010, P.R.China;

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Linking nutrient strategies with plant size along a grazing gradient：Evidence fromLeymus chinensis in a natural pasture

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