干旱区生态环境知识资源中心(Arid): 荒漠绿洲过渡带柽柳种群结构与空间格局动态

Arid

	荒漠绿洲过渡带柽柳种群结构与空间格局动态
其他题名	Dynamic changes of spatial pattern and structure of the Tamarix ramosissima population at the desert-oasis ecotone of the Tarim Basin
	康佳鹏; 马盈盈; 马淑琴; 薛正伟; 杨丽丽; 韩路; 柳维扬
来源期刊	生态学报
ISSN	1000-0933
出版年	2019
卷号	39 期号:1 页码:265-276
中文摘要	在塔克拉玛干沙漠北缘荒漠绿洲过渡带设置1 hm~2研究样地,应用相邻格子法进行每木调查,从径级结构、空间分布格局、生命表、存活曲线和时间序列等方面研究柽柳种群结构与空间格局动态及其形成机理。结果表明:荒漠绿洲过渡带柽柳群落结构简单、物种稀少,多为单优群落。柽柳种群径级与高度结构均呈纺锤型,属衰退型种群;存活数、期望寿命(ex)随径级增加而降低,存活曲线接近Deevey Ⅱ型,小径级死亡率、消失率与高度级失稳率较高,未来小径级、大径级灌木数量分别随时间推移减少与显著增多,更新资源匮乏使种群走向衰败。柽柳种群空间格局总体上为聚集分布,幼苗、小径级灌木为聚集分布,中、大径级灌木则为随机分布;不同径级的空间格局随尺度变化明显不同,小径级与大径级灌木分别在<3 m、<13 m和17-36 m尺度内呈随机分布,其他尺度均呈聚集分布,而中等径级灌木在研究尺度内呈随机分布,这是其繁殖特性、种内竞争、生境异质性与生态适应的结果。小径级与中等径级灌木、小径级与大径级灌木空间关联性分别在≥9 m、7-47 m空间尺度上相互排斥,致使幼小径级生长发育受抑而影响种群稳定。种群多度分布与环境的多元统计分析表明土壤水分、氮素是限制柽柳种群生长、分布和造成种群更新困难、衰退的主要因子。
英文摘要	Tamarix ramosissima is perennial shrub with strong resistance to drought, salinity, and wind. As one of the ecological keystone species of the Tarim Desert natural ecosystem, it plays a dominant role in maintaining the stabilized structure and function of the desert ecosystem and protecting the ecological safety of the oasis. To illuminate the ecological characteristics of a T. ramosissima population and to better understand the effects of biological and environmental factors on its population distribution, we studied the population structure, life table, survivorship curve, quantitative dynamics, and spatial distribution patterns of a T. ramosissima population at the desert-oasis ecotone of the Tarim Basin,Xinjiang,China. Ensuring the wise use, conservation, and preservation of the ecological bushwood in the Tarim Basin was the goal of this study. The age structure, life table, survivorship curve, and time sequence prediction of the T. ramosissima population were determined to analyze its population structure and dynamics. A simple community structure and a sparse species composition were found in the T. ramosissima at the desert-oasis ecotone of Tarim Basin. The age structure of the T. ramosissima population had a spindle-type shape with a low percentage of younger individuals,indicating that the population is likely to decline continuously. The number of surviving individuals and life expectancy of the T. ramosissima population monotonically decreased with increasing size class. The survivorship curve generally matched with Deevey II type. Small size shrubs are always accompanied with higher mortality rates and hazard rates, while highness class structure indicated low shrubs had higher lost stable rate. Seedlings could not be regenerated in time. The number of large size shrubs increased significantly with community development, which accelerates the shrunk of population size. This species generally had a clumped distribution pattern. Nevertheless,this pattern gradually changed over time from a clumped to a random pattern as shrubs matured from young to middle-aged to old-growth shrubs. Spatial variations of different growth stages changed obviously with different scales. Small size shrubs and large size shrubs had random distributions at scales of 0-3 m,0-13 m and 17-36 m, respectively. They showed aggregated distributions at other scales. Mid-sized shrubs had a random distribution at all scales,which was related to habitat heterogeneity,reproductive characteristics,intraspecific competition, and ecological adaptation. Results of the spatial association analysis showed that small size shrubs were significantly negatively associated (mutually exclusive) to mid-size shrubs at scales ≥ 9m,to large size shrubs at scales of 7-47 m, which were not conducive to the growth and regeneration of small individuals, further to affect population stability. Correlation and stepwise regression analysis between environmental factors and abundance distribution showed that the soil water and nitrogen contents were the main factors that restricted the growth, distribution, and regeneration.
中文关键词	荒漠绿洲过渡带 ; 柽柳 ; 种群动态 ; 空间格局 ; 形成机制
英文关键词	desert-oasis ecotone Tamarix ramosissima population dynamics spatial pattern formation mechanism
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:6409769
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/239396
作者单位	塔里木大学植物科学学院, 阿拉尔, 新疆 843300, 中国
推荐引用方式 GB/T 7714	康佳鹏,马盈盈,马淑琴,等. 荒漠绿洲过渡带柽柳种群结构与空间格局动态[J],2019,39(1):265-276.
APA	康佳鹏.,马盈盈.,马淑琴.,薛正伟.,杨丽丽.,...&柳维扬.(2019).荒漠绿洲过渡带柽柳种群结构与空间格局动态.生态学报,39(1),265-276.
MLA	康佳鹏,et al."荒漠绿洲过渡带柽柳种群结构与空间格局动态".生态学报 39.1(2019):265-276.