干旱区生态环境知识资源中心(Arid): 黄土高原白羊草种群分布格局对水热梯度的响应

Arid

	黄土高原白羊草种群分布格局对水热梯度的响应
其他题名	Responses of distribution of Bothriochloa ischaemum community to hydrothermal gradient in loess plateau
	程杰 1; 呼天明 1; 程积民 2
来源期刊	草地学报
ISSN	1007-0435
出版年	2010
卷号	18 期号:2 页码:167-171
中文摘要	为揭示白羊草(Bothriochloa ischaemum)种群地带性分布与水热梯度的关系,试验于2005年-2009年,采用野外调查与定位监测相结合的研究方法,分析了黄土高原半干旱-半湿润区水热梯度对白羊草群落分布与生态幅的影响.结果表明,受海拔高度的影响,白羊草的垂直分布已由适宜生长的500 m-1700 m海拔范围扩展到海拔1950 m的上界,种群密度达3-4株/m~2,生殖枝数为12株/丛,生物量为12 g/丛;受降水梯度等影响,白羊草的水平分布范围已由森林草原地带的建群种或优势种扩展到了典型草原地带,并从伴生种上升为优势种.在荒漠草原地带的沟谷阳坡也常呈偶见种出现,并从年降雨500 mm-800 mm的适宜区扩大到300 mm-900 mm范围的降雨区.因此表明,在全球气候变化背景下,典型指示植物-白羊草种群受区域水热环境的影响,生态幅逐渐扩大,但其稳定性有待长期研究.
英文摘要	To find out the relationship between the zonal distribution of Bothriochloa ischaemum population and the Hydrothermal gradient, the effects of the hydrothermal gradient on the zonal and ecological amplitude of Bothriochloa ischaemum population in the semi-arid and semi-humid region of Loess Plateau with field survey and position monitoring were studied from 2005 to 2009. The elevation gradient affected Bothriochloa ischaemum extend from its optimal vertical elevation of 500 m-1700 m above sea level to 1950 m above sea level. With population density within 3 to 4 plants/m~2, its reproductive branches were 12 per cluster and its biomass reached 12 g per cluster. And the rainfall gradient made Bothriochloa ischaemum horizontal distribution from forest steppe zones to the typical grassland zone, which means it became the dominate species instead of the companion species. Also, it appeared as the occasional species on the south-facing lands of the gullies and valleys in the forest steppe zone and its optimal rainfall limits changed from 500 mm-800 mm to 300 mm-900 mm. Furthermore, the conclusion indicated that under global climate changes, Bothriochloa ischaemum as a typical indicting plant gradually widened its ecological amplitude.
中文关键词	黄土高原 ; 白羊草 ; 分布密度 ; 水热梯度 ; 响应
英文关键词	Loess plateau Bothriochloa ischaemum Distributed density Hydrothermal gradient Responses
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:3858653
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/224715
作者单位	1.西北农林科技大学动物科技学院, 杨凌, 陕西 712100, 中国; 2.中国科学院水利部水土保持研究所, 杨凌, 陕西 712100, 中国
推荐引用方式 GB/T 7714	程杰,呼天明,程积民. 黄土高原白羊草种群分布格局对水热梯度的响应[J]. 西北农林科技大学,2010,18(2):167-171.
APA	程杰,呼天明,&程积民.(2010).黄土高原白羊草种群分布格局对水热梯度的响应.草地学报,18(2),167-171.
MLA	程杰,et al."黄土高原白羊草种群分布格局对水热梯度的响应".草地学报 18.2(2010):167-171.