Effects of grazing intensity on decompositions of two dominant plant species litters in alpine meadow on the Northwester Sichuan
GAO Yong-heng1, CHEN Huai2, LUO Peng2, WU Ning2, WANG Gen-xu1
1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences and Ministry of Water Resources, Chengdu 610041, China; 2. Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
The decompositions of two dominant plant species litters under different grazing intensity in alpine meadow on the Northwester Sichuan were studied. The relative weight loss in the litter of Roegneria nutans is 26.0, 27.2, 29.6 and 32.8% for no grazing, light grazing, moderate grazing and heavy grazing, respectively; while 44.0, 46.2, 50.4 and 56.2% for the litter of Kobresia setchwanensis. Relative carbon loss in the litter of Roegneria nutans was 26.1%, 27.5%, 29.4% and 32.9% for no grazing, light grazing, moderate grazing and heavy grazing, respectively; while 41.9%, 44.3%, 48.5% and 54.4% for the litter of Kobresia setchwanensis; Relative nitrogen loss in the litter of Roegneria nutans was 13.6%, 14.4%, 17.3% and 19.1% for no grazing, light grazing, moderate grazing and heavy grazing, respectively; while 39.4%, 41.4%, 46.4% and 52.8% for the litter of Kobresia setchwanensis. It is concluded that increased grazing intensity tended to increase the decompositions of litters and accelerate the carbon and nitrogen cycling rates within the plant-soil system in the alpine meadow.
高永恒1, 陈槐2, 罗鹏2, 吴宁2*, 王根绪1. 放牧强度对川西北高山草甸两个优势物种凋落物分解的影响[J]. , 2007, 26(3): 193-198.
GAO Yong-heng1, CHEN Huai2, LUO Peng2, WU Ning2, WANG Gen-xu1. Effects of grazing intensity on decompositions of two dominant plant species litters in alpine meadow on the Northwester Sichuan. , 2007, 26(3): 193-198.
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