石羊河中游河岸沙蒿种群的空间格局和关联性分析  

Spatial Distribution Pattern and Relevancy of Artemisia arenariaPopulation along the River Course of Middle Reaches of the Shiyang River

作　　者：张莹花[1,2] 刘世增[1,2] 刘虎俊[1,2] 满多清[1,2] 李银科[1,2] 韩福贵[1,2] 

机构地区：[1]甘肃省荒漠化与风沙灾害防治省部共建国家重点实验室培育基地,甘肃省治沙研究所,甘肃兰州730070 [2]武威绿洲站,甘肃武威733000

出　　处：《干旱区研究》2013年第2期256-263,共8页Arid Zone Research

基　　金：国家自然基金项目(31060080);甘肃省科技支撑项目(090NKCA121)

摘　　要：以石羊河中游荒漠河岸植被优势种群沙蒿(Artemisia arenaria)为研究对象,采用点格局分析法,对垂直于河道不同距离梯度上沙蒿种群的空间格局和空间关联性进行了分析。结果表明:①随着垂直于河道方向距离的递增,沙蒿种群由增长型逐渐演变为衰退型;②垂直于河道不同距离梯度上沙蒿种群的格局特征为,在相对小的尺度上聚集分布特征明显,随尺度的增加聚集性减弱并逐渐表现出随机分布的格局特征,但距离河道近的沙蒿种群聚集强度大于距离河道远的种群;不同距离梯度上,沙蒿种群均表现出幼体聚集分布,成体随机分布的格局特征;③垂直于河道不同距离梯度上沙蒿种群不同龄级之间的关联性表现出异质性。距离河道近的沙蒿种群中,形体差异大的植株之间具有正关联性,反映了互利的生态关系;距离河道较远的沙蒿种群中,形体差异小的植株之间具有负关联性,反映了互斥的生态关系;其他龄级植株之间没有表现出明显的关联性。Artemisia arenaria is an important plant species of fixing sand in the Shiyang River Basin, Gansu Province. In this study, some sample plots with different distance away from the river course of the Shiyang River were delimited to analyze the spatial distribution pattern of Artemisia arenaria population. In the plots, the height, crown breadth and spatial relevancy of all the different-aged Artemisia arenaria plants were recorded. The point pattem a- nalysis was used to analyze the spatial distribution pattern and relevancy of the plants in different plots. The results were as follows ： （ 1 ） Artemisia arenaria population was in a decrease trend with the increase of distance away from the river course; （2） Artemisia arenaria population was in a significant aggregation distribution pattern at relatively small scale, the aggregation distribution pattern decreased gradually with the enlargement of scale, a random distri- bution occurred, and the aggregation degree near the river course was higher than that far away from the river course. At different distance, young plants grew in an aggregation pattern, but the adult ones in random pattern; （3） There was a positive spatial relevancy among the high plants near the river course, but a negative one among the short plants far away from the river course.

关 键 词：河岸 沙蒿(Artemisia arenaria) 种群 空间格局 关联性 石羊河 

分 类 号：Q948[生物学—植物学]