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Effects of Stocking Rate on the Variability of Peak Standing Crop in a Desert Steppe of Eurasia Grassland

文献类型： 外文期刊

作者： Wang, Zhongwu 1 ; Jiao, Shuying 2 ; Han, Guodong 1 ; Zhao, Mengli 1 ; Ding, Haijun 1 ; Zhang, Xinjie 1 ; Wang, Xiaolia 1 ;

作者机构： 1.Inner Mongolia Agr Univ, Coll Ecol & Environm Sci, Dept Grassland Sci, Hohhot 010018, Inner Mongolia, Peoples R China

2.Shandong Agr Univ, Coll Resources & Environm, Tai An 271018, Shandong, Peoples R China

3.Tristar Land Technol, Dillon, MT USA

4.Agr & Agri Food Canada, Lethrridge Res Ctr, Lethbridge, AB T1J 4B1, Canada

5.ARS, USDA, Jornada Expt Range, Las Cruces, NM 88003 USA

6.Inner Mongolia Acad Agr & Anim Husb Sci, Hohhot 010

关键词： Sheep grazing;Peak standing crop;Plant functional group;Stipa breviflora;Ecosystem stability

期刊名称：ENVIRONMENTAL MANAGEMENT （ 影响因子：3.266； 五年影响因子：3.372 ）

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收录情况： SCI

摘要： Proper grazing management practices can generate corresponding compensatory effects on plant community production, which may reduce inter-annual variability of productivity in some grassland ecosystems. However, it remains unclear how grazing influences plant community attributes and the variability of standing crop. We examined the effects of sheep grazing at four stocking rate treatments [control, 0 sheep ha~(-1) month~(-1); light (LG), 0.15 shee-p ha~(-1) month~(-1); moderate (MG), 0.30 sheep ha~(-1) month ; and heavy (HG), 0.45 sheep ha month ] on ' standing crop at the community level and partitioned by species and functional groups, in the desert steppe of Inner Mongolia, China. The treatments were arranged in a completely randomized block design over a 9-year period. Standing crop was measured every August from 2004 to 2012. Peak standing crop decreased (P < 0.05) with increasing stocking rate; peak standing crop in the HG treatment decreased 40 % compared to the control. May-July precipitation explained at least 76 % of the variation in peak standing crop. MG and HG treatments resulted in a decrease (P < 0.05) in shrubs, semi-shrubs, and perennials forbs, and an increase (P < 0.05) in perennial bunchgrasses compared to the control. The coefficients of variation at plant functional group and species level in the LG and MG treatments were lower (P < 0.05) than in the control and HG treatments. Peak standing crop variability of the control and HG community were greatest, which suggested that LG and MG have greater ecosystem stability.

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[1]Effect of manipulating animal stocking rate on the carbon storage capacity in a degraded desert steppe. Wang, Zhongwu,Han, Guodong,Zhao, Mengli,Ding, Haijun,Li, Zhiguo,Wang, Jing,Hao, Xiying,Hamilton, Alistair,Liu, Yongzhi,A, Lata,Hexige, Baoyin. 2017

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