干旱区生态环境知识资源中心(Arid): 极端干旱对荒漠草原群落物种多样性和地上生物量碳氮的影响

Arid

	极端干旱对荒漠草原群落物种多样性和地上生物量碳氮的影响
其他题名	Effect of Extreme Drought on the Community Species Diversity and Aboveground Biomass Carbon and Nitrogen in the Desert-steppe Region in Northern China
	张蕊 1; 赵学勇2 ; 王少昆 2; 左小安 2; 王瑞雄 1
来源期刊	生态环境学报
ISSN	1674-5906
出版年	2019
卷号	28 期号:4 页码:715-722
中文摘要	极端干旱及其对植物群落物种多样性的影响是气候变化及其影响评估的重要内容之一,而有关干旱荒漠草原区气候变化与植物群落多样性及其功能关系的研究鲜见报道.为明晰极端干旱对荒漠草原物种多样性和地上生物量的影响,利用野外极端干旱处理试验平台,研究了荒漠草原沙生针茅群落物种多样性和地上生物量及其碳、氮密度对极端干旱的响应特征.结果表明,极端干旱改变了荒漠草原沙生针茅(Stipa glareosa)群落的物种组成,进而使物种多样性发生变化.在8月份,生长季5-8月截雨66%和6-7月干旱60 d两种极端干旱处理都降低了群落的Shannon-Wiener指数和物种丰富度指数.两种极端干旱处理使地上现存生物量较对照降低了50%以上(P<0.05).生长季5-8月截雨66%干旱处理使凋落物生物量较对照降低了61%(P<0.05),同时使凋落物生物量的碳氮密度显著低于对照.两种极端干旱处理使地上现存生物量的碳氮密度显著低于对照.因此,极端干旱不仅改变了荒漠草原群落的物种组成,而且改变了地上生物量,影响了植被碳氮密度,从而减弱荒漠草原植物群落地上部分的碳氮汇功能.
英文摘要	Extreme drought and its impact on plant species diversity is one of the important issues of climate change and its impact assessment. However, there are few studies on the relationship between climate change and plant community diversity and its function in desert-steppe. To address this knowledge gap, responses of the Stipa glareosa community species diversity, aboveground biomass and its carbon and nitrogen density to extreme drought was examined by an in situ experimental platform in desertgrassland region in northern China, for enhancing our understanding of the effects of extreme drought on desert-grassland community. The results indicated that extreme drought changed the Stipa glareosa community species composition and diversity. In august, the two extreme drought treatments of reducing 66% of ambient rainfall from May to August and reducing 100% of ambient rainfall in June and July decreased community Shannon-Wiener index and species richness. Compared with the CK, the standing aboveground biomass was decreased more than 50% by two extreme drought treatments (P<0.05). And litters biomass was decreased 61% by reducing 66% of ambient rainfall from May to August (P<0.05). The standing aboveground biomass carbon, nitrogen density in the two extreme drought treatments was significantly lower than these of CK. The litters biomass carbon, nitrogen density was significantly reduced by reducing 66% of ambient rainfall from May to August. Consequently, extreme drought affected vegetation carbon, nitrogen density through altering species composition and aboveground biomass, and ultimately weakened the carbon, nitrogen sink function of desert-grassland ecosystem.
中文关键词	荒漠草原 ; 物种多样性 ; 生物量 ; 碳密度 ; 极端干旱
英文关键词	desert-grassland species diversity biomass carbon density extreme drought
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:6498017
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/239385
作者单位	1.中国科学院西北生态环境资源研究院,乌拉特荒漠草原研究站/奈曼沙漠化研究站;;中国科学院大学, ;;, 兰州;;, 甘肃;;北京 730000;;100049, 中国; 2.中国科学院西北生态环境资源研究院,乌拉特荒漠草原研究站/奈曼沙漠化研究站, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	张蕊,赵学勇,王少昆,等. 极端干旱对荒漠草原群落物种多样性和地上生物量碳氮的影响[J],2019,28(4):715-722.
APA	张蕊,赵学勇,王少昆,左小安,&王瑞雄.(2019).极端干旱对荒漠草原群落物种多样性和地上生物量碳氮的影响.生态环境学报,28(4),715-722.
MLA	张蕊,et al."极端干旱对荒漠草原群落物种多样性和地上生物量碳氮的影响".生态环境学报 28.4(2019):715-722.