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	Tradeoffs between forage quality and soil fertility: Lessons from Himalayan rangelands
	Niu, Kechang ; He, Jin-sheng ; Zhang, Shiting ; Lechowicz, Martin J.
	2016
关键词	Alpine meadow Community weighted mean Functional diversity Leaf traits Soil fertility GRASSLAND PLANT DIVERSITY QINGHAI-TIBETAN PLATEAU ALPINE MEADOW FUNCTIONAL DIVERSITY INNER-MONGOLIA LEAF TRAITS ECOSYSTEM SERVICES PHOSPHORUS NITROGEN CHINA
英文摘要	Pastoralists on Eurasian rangeland often believe that traditional management practices involving moderate rotational grazing ensure sustainable yield, increase plant digestibility and promote biodiversity. To assess the generality of these suppositions we compared biomass production, community leaf C, N and P stoichiometry, leaf trait diversity and carbon and nutrient pools in root and soil for moderately grazed vs. ungrazed plots in Tibetan alpine meadows. We used five leaf traits (leaf C, leaf N and leaf P concentrations; SLA: specific leaf area, and LDMC: leaf dry matter content) as indicators of plant digestibility and rangeland quality. We measured these foliar traits and the ramet numbers for component species in moderately grazed plots as well as in exclosures (3-11 years) at five sites across the Qinghai-Tibetan plateau. Community weighted mean (CWM) trait values and functional dispersion (FDis) were used to quantify the mean and the variance in the distribution of trait values, respectively. Both the leaf P-CWM and leaf P-FDis generally increased under grazing and the LDMCCWM decreased, leading to improved plant digestibility and rangeland quality (e.g. high, community-wide leaf nutrients). The leaf C-CWM, leaf N-CWM and SLA(CWM) increased under grazing but the FDis of these traits tended to decrease. Grazing generally increased species diversity but decreased aboveground biomass, organic carbon, and nutrient concentrations in soil and root, especially decreasing root nitrogen and soil available phosphorus. Both root biomass and the leaf C:N (CWM) decreased in grazed plots at wet sites, but increased at dry sites. The community-wide increase and greater interspecific diversity in leaf nutrient concentrations coupled with decreasing LDMCCWM show that grazing induced an increase in plant digestibility, nutrient concentrations, and nutrient diversity in these alpine meadows. However, this increase in forage quality comes at the cost of losses in both carbon stock and nutrient availability that depress biomass production. Our findings and a review of related literature suggest that traditional grazing practices involve a trade-off between short-term yield and sustainability, a management challenge that must be addressed on rangelands with low soil fertility. (C) 2016 Elsevier B.V. All rights reserved.; CPCI-S(ISTP); ,SI; 31-39; 234
语种	英语
出处	Session on Alternative Grazing Practices as a Restoratioin Tool - Challenges, Opportunities and Limits held at the 9th European Conference on Ecological Restoration
DOI标识	10.1016/j.agee.2016.04.023
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/459443]
专题	城市与环境学院
推荐引用方式 GB/T 7714	Niu, Kechang,He, Jin-sheng,Zhang, Shiting,et al. Tradeoffs between forage quality and soil fertility: Lessons from Himalayan rangelands. 2016-01-01.

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