气候变化领域集成服务门户(CCPortal): Effects of clipping on diversity and above-ground biomass associated with soil fertility on an alpine meadow in the eastern region of the Qinghai-Tibetan Plateau

CCPortal

DOI	10.1080/00288230709510304
	Effects of clipping on diversity and above-ground biomass associated with soil fertility on an alpine meadow in the eastern region of the Qinghai-Tibetan Plateau
	Han, Wenwu; Luo, Yanjiang; Du, Guozhen
发表日期	2007
ISSN	0028-8233
EISSN	1175-8775
起始页码	361
结束页码	368
卷号	50 期号:3
英文摘要	The objective of this research was to test the hypothesis that effects of different clipping regimes on diversity on an alpine meadow are due to soil fertility. Species richness should be greatest at an intermediate level of disturbance, e.g., clipping, since dominance is prevented and the pool of potential colonists is relatively large. We predict the effects of clipping on species richness, diversity and above-ground biomass based on the disturbance hypothesis. A natural pasture was used for the experiment that was a randomised complete block design with four levels of nutrient input annually from the 2001 growing season. During 2004, subplots were clipped to stubble heights of 2, 4 and 10 cm above the soil surface, with a control. Species richness declined to an average of 6 and 19 species per quadrat for the treatments that were heavily clipped twice, compared to an average of I I and 31 species per quadrat in the unclipped treatment receiving nutrient input of 120 g of fertiliser/m(2) and control plots, respectively. Species richness was not altered by the other clipping treatments at any nutrient level. Species richness declined in plots with the highest nutrient input and in control plots with heavy clipping twice, but species richness had no obvious changes in those plots receiving the intermediate level clipping at all nutrient levels. Available phosphorus increased significantly with increased nutrient addition, however soil pH decreased. Available nitrogen and organic matter did not change significantly with nutrient addition. The clipping regime contributed to the dominance of graminoids with increased nutrient input, and the dominant graminoids assimilated large amounts of available nitrogen and organic matter, which resulted in the minor changes in available nitrogen in soil.
关键词	NUTRIENT AVAILABILITY SPECIES-DIVERSITY PLANT GRASSLAND RESTORATION COMMUNITIES COMPETITION VEGETATION
英文关键词	above-ground biomass; available nitrogen; available phosphorus; clipping; nutrient addition; species richness
语种	英语
WOS研究方向	Agriculture
WOS类目	Agriculture, Multidisciplinary
WOS记录号	WOS:000250474400010
来源期刊	NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257476
推荐引用方式 GB/T 7714	Han, Wenwu,Luo, Yanjiang,Du, Guozhen. Effects of clipping on diversity and above-ground biomass associated with soil fertility on an alpine meadow in the eastern region of the Qinghai-Tibetan Plateau[J]. 中国科学院青藏高原研究所,2007,50(3).
APA	Han, Wenwu,Luo, Yanjiang,&Du, Guozhen.(2007).Effects of clipping on diversity and above-ground biomass associated with soil fertility on an alpine meadow in the eastern region of the Qinghai-Tibetan Plateau.NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH,50(3).
MLA	Han, Wenwu,et al."Effects of clipping on diversity and above-ground biomass associated with soil fertility on an alpine meadow in the eastern region of the Qinghai-Tibetan Plateau".NEW ZEALAND JOURNAL OF AGRICULTURAL RESEARCH 50.3(2007).