干旱区生态环境知识资源中心(Arid): 雅鲁藏布江中游干旱沙地砂生槐种群结构与点格局分析

Arid

	雅鲁藏布江中游干旱沙地砂生槐种群结构与点格局分析
其他题名	Population Structure and Spatial Point Pattern of Sophora moorcroftianain Arid Sandy Land in the Middle Reaches of Yarlung Zangbo River Tibet
	王国严 1; 方江平 1; 许新勇 2; 尼玛曲珍 1; 钟蕊 2; 赵旷 2
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2010
卷号	30 期号:5 页码:1092-1098
中文摘要	砂生槐(Sophora moorcroftiana)是雅鲁藏布江中游干旱河谷区植被群落的重要建群种,具有极强的耐瘠薄、抗风沙等生态适应性和防风固沙、保持水土功能. 为了揭示砂生槐种群的结构、生长特征和空间分布规律,运用大小级组成和Ripley’s K函数分别研究了砂生槐的种群结构和空间点格局,发现砂生槐个体主要集中在中等大小(冠幅40~80cm,高度20~40cm)范围,幼苗期成活率较低,中等个体抗逆和生存能力较强. 砂生槐种群的发展演替过程可以概括为:少数个体集群性定居在原有聚集尺度范围繁殖种群改良局部环境,密度增大,种内竞争加剧种群向更大尺度扩散和壮大,演替进入顶极阶段. 砂生槐种群各大小级都呈现以9m左右尺度斑块状聚集分布的特征,在实地生态恢复过程中应遵循其生长和自然分布规律,人工栽培中应重点注意冠幅<20cm、高度< 13cm阶段幼苗的抚育,另外应首先选择土质等条件相对优越的小生境种成适当规模的集群分布形式,充分发挥其防风沙的能力、提高栽培成活率和固沙效率
英文摘要	Sophora moorcroftiana, which has a strong tolerance ability to blown sand and soil impoverishment and a potential value of sand fixation and soil conservation, is the constructive species of the arid valley vegetation community in middle reaches of the Yarlung Zangbo River. To explore the population structure, growth characteristics and spatial distribution pattern, size classes statistics and Ripley’s K function are used to study the population structure and spatial pattern of S. moorcroftiana respectively. The results are as follows. (1) Majority of the S. moorcroftiana population are medium-size individuals because the survival rate of seedlings is low, in contrast, adverse resistance and survivability of medium-size individuals are powerful. (2) Successional process of S. moorcroftiana population follows an order: a few individuals invade-the population multiply--habitats are improved and population density increases to induce excessive competition--the population expand spatially and succession enters the climax phase. (3) The individuals of S. moorcroftiana of different size classes are all aggregated on a scale of 9 m. It is suggested that in breeding of S. mnoorcroftiana people should pay more attention to the seedlings with the crown width less than 20 cm or the height less than 13 cm and choose relatively superior habit to cultivate large population to boost survival, rate, so as to make full use of its abilities of windbreak and sand-fixation
中文关键词	砂生槐 ; 种群结构 ; 点格局 ; 固沙效率 ; 雅鲁藏布江
英文关键词	Sophora moorcroftiana population structure spatial point pattern sand-fixation efficiency Yarlung Zangbo River
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:3981733
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/226025
作者单位	1.西藏农牧学院, 林芝, 西藏 860000, 中国; 2.西藏高原生态研究所, 林芝, 西藏 860000, 中国
推荐引用方式 GB/T 7714	王国严,方江平,许新勇,等. 雅鲁藏布江中游干旱沙地砂生槐种群结构与点格局分析[J],2010,30(5):1092-1098.
APA	王国严,方江平,许新勇,尼玛曲珍,钟蕊,&赵旷.(2010).雅鲁藏布江中游干旱沙地砂生槐种群结构与点格局分析.中国沙漠,30(5),1092-1098.
MLA	王国严,et al."雅鲁藏布江中游干旱沙地砂生槐种群结构与点格局分析".中国沙漠 30.5(2010):1092-1098.