摘要
采用相邻格子法,以西藏山南地区雅鲁藏布江中游河谷砂生槐种群为研究对象,分别在半固定沙地和固定沙地设立20 m×30 m的样方,研究了不同生境条件下砂生槐种群径级结构、静态生命表、存活曲线等生活史特征的异同及其影响因素。结果表明,西藏高原砂生槐在半固定沙地和固定沙地2种生境中的种群径级结构均呈现基部宽,顶部窄,随径级增大个体植株数减少的趋势。半固定沙地砂生槐种群是增长型种群,固定沙地砂生槐种群结构偏向成熟型。砂生槐种群在幼苗阶段死亡率较高,进入中龄期后死亡率有所降低。半固定沙地和固定沙地的砂生槐种群均呈DeeveyΠ型(直线型)分布。
This paper studied Sophora moorcroftiana population by establishing two plots（20 m× 30 m） on semi-fixed and fixed sandy lands in the middle reaches of the Yarlung Zangbo river.The height and diameter at basic height（DBH） of each individual tree in each community were measured,and life history was characterized using DBH class structure,static life table,survival curves.The results showed that the DBH class structures of Sophora moorcroftiana on the semi-fixed sandy land and fixed sandy land were similar,being broad at the base and narrow at the top with the individual numbers reduced as the DBH class increases.Sophora moorcroftiana population structure belonged to the growing type on the semi-fixed sandy land and approached mature type on the fixed sandy land.The seedlings of Sophora moorcroftiana had high mortality rate,while the adult trees had lower mortality rate,with the survivorship curve following the Deevey TypeⅡ.
出处
《水土保持通报》
CSCD
北大核心
2011年第3期36-39,共4页
Bulletin of Soil and Water Conservation
基金
国家环保公益性行业科研专项"高寒河谷沙尘治理技术试验研究"(200809010)
关键词
西藏砂生槐
种群结构
静态生命表
存活曲线
Sophora moorcroftiana population in Tibet
DBH class structure
static life table
survival curve
