Arid
DOI10.1016/j.ecocom.2012.04.004
Moderate grazing can promote aboveground primary production of grassland under water stress
Luo, Geping1,2; Han, Qifei1,3; Zhou, Decheng1; Li, L.1; Chen, Xi1,2; Li, Yan1,2; Hu, Yukun1; Li, B. Larry2,4
通讯作者Li, L.
来源期刊ECOLOGICAL COMPLEXITY
ISSN1476-945X
出版年2012
卷号11页码:126-136
英文摘要

Comprehensive understanding on the response of net primary production (NPP) to grazing is still elusive. It is necessary to choose a suitable study area with significant differences in climate, landform, diverse grasslands and grazing intensity (GI), to better understand plant-herbivore interactions and what environmental conditions NPP may increase. This study used Biome-BGC model with inclusion of a grazing process and the effects of the excreta on vegetation to investigate the effects of grazing on the aboveground NPP (ANPP) in Tianshan Mountains-Junggar Basin with four grasslands along a climatic gradient from mountain to plain, i.e., alpine meadow (AM), mid-mountain forest-meadow (MMFM), low-mountain dry grassland (LMDG), and plain desert grassland (PDG). The model simulated ANPP agreed well with the measured values for both non-grazed and grazed experiments at four sites, suggesting that the model successfully captured the effects of grazing on ANPP. The model results based on different Cl scenarios indicated that ANPP decreased with increasing Cl at AM and MMFM. But at LMDG and PDG, ANPP increased when GI was smaller than optimal GI (GI(opt)). After GI(opt), ANPP decreased with the increasing GI. This implied that appropriate Cl stimulated ANPP at LMDG and PDG, with magnitude of 4.1-22% at LMDG and 6.6-15.7% at PDG. By investigating the annual evapotranspiration (ET) and soil volumetric water content under non-grazed and grazed conditions, it was found that grazing reduced ET and hence improved soil water at sites LMDG and PDG, which explained the different response of ANPP to GI in different grasslands. We concluded that the response of ANPP to Cl highly depended on the climatic conditions in grassland ecosystems over Central Asia, and moderate grazing can promote ANPP under water stress. (C) 2012 Elsevier B.V. All rights reserved.


英文关键词Biome-BGC Grazing intensity Compensatory growth Water stress Aboveground net primary production Tianshan Mountains
类型Article
语种英语
国家Peoples R China ; USA
收录类别SCI-E
WOS记录号WOS:000307684100014
WOS关键词NET PRIMARY PRODUCTION ; OPTIMIZATION HYPOTHESIS ; ENVIRONMENTAL-FACTORS ; TIANSHAN MOUNTAINS ; SHORTGRASS STEPPE ; PLANT-PRODUCTION ; CLIMATE-CHANGE ; GREAT-PLAINS ; HERBIVORY ; ECOSYSTEM
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
来源机构中国科学院新疆生态与地理研究所
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/172021
作者单位1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Peoples R China;
2.Chinese Acad Sci, XIEG UCR Int Ctr Arid Land Ecol, Urumqi 830011, Xinjinag, Peoples R China;
3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China;
4.Univ Calif Riverside, Dept Bot & Plant Sci, Riverside, CA 92521 USA
推荐引用方式
GB/T 7714
Luo, Geping,Han, Qifei,Zhou, Decheng,et al. Moderate grazing can promote aboveground primary production of grassland under water stress[J]. 中国科学院新疆生态与地理研究所,2012,11:126-136.
APA Luo, Geping.,Han, Qifei.,Zhou, Decheng.,Li, L..,Chen, Xi.,...&Li, B. Larry.(2012).Moderate grazing can promote aboveground primary production of grassland under water stress.ECOLOGICAL COMPLEXITY,11,126-136.
MLA Luo, Geping,et al."Moderate grazing can promote aboveground primary production of grassland under water stress".ECOLOGICAL COMPLEXITY 11(2012):126-136.
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