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

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Abstract

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.

Key words： grazing litter Roegneria nutans Kobresia setchwanensis carbon and nitrogen

Received: 25 June 2007

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	Articles by authors
	GAO Yong-heng
	CHEN Huai
	LUO Peng
	WU Ning
	WANG Gen-xu

Cite this article:

GAO Yong-heng,CHEN Huai,LUO Peng, et al. Effects of grazing intensity on decompositions of two dominant plant species litters in alpine meadow on the Northwester Sichuan[J]. , 2007, 26(3): 193-198.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2007/V26/I3/193

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