生态学杂志2013，Vol.32Issue(2)：292-298,7.
高寒草地狼毒与阴山扁蓿豆种群的空间格局
Spatial patterns of Stellera chamaejasme and Melilotoides ruthenicus var. inschanicus populations in alpine grassland
摘要
Abstract
Different types of spatial pattern and spatial association of plant populations can reflect their adaptive strategies in using environmental resources, and can reveal the population biology under disturbances. By using point pattern analysis, this paper studied the spatial pattern and spatial association of Stellera chamaejasme and Melilotoides ruthenicus var. inschanicus at their different succession stages on the northern slope of Qilian Mountains, Northwest China. With the degradation of natural grassland, the plant density, plant height, and aboveground biomass of S. chamaejasme population had a persistent increase, the spatial pattern transferred from aggrega-tive into random or regular. In the meantime, the plant height of M. ruthenicus var. inschanicus population decreased gradually, its plant density and aboveground biomass decreased after an ini-tial increase, and the spatial pattern transferred from aggregative or regular to random. The spa-tial association between S. chamaejasme and M. ruthenicus var. inschanicus populations trans-ferred from increasingly positive to not significant. During the degradation of natural grassland, the decline of Stipa krylovii population at the upper layer of the community and the differences in the plant height between S. chamaejasme and M. ruthenicus var. inschanicus made an asymmetric competition of light resources, which led to the regulation of the resource allocation strategies of S. chamaejasme and M. ruthenicus var. inschanicus, and affected the spatial pattern and spatial association of the two plants.关键词
退化草地/祁连山北坡/狼毒/阴山扁蓿豆/空间分布格局/空间关联性Key words
degraded grassland/northern slope of Qilian Mountains/Stellera chamaejasme/Me-lilotoides ruthenicus var. inschanicus/spatial distribution pattern/spatial association分类
农业科技引用本文复制引用
党晶晶,赵成章,任珩,杨泉,查高德..高寒草地狼毒与阴山扁蓿豆种群的空间格局[J].生态学杂志,2013,32(2):292-298,7.基金项目
国家自然科学基金项目(91125014和40971039)、甘肃省科技支撑计划项目(1011FKCA157)和甘肃省生态经济重点学科项目资助. （91125014和40971039）
