Spatial pattern analysis of two herbaceous plants on semi-fixed sand dune in Kubqi Desert
BI Chao, ZHOU Yu-Chi, DIAO Yun-Jie, YANG Xiao-Hui
（1.College of Soil and Water Conservation, Beijing Forestry University, 100083, Beijing; 2.Beijing Soil and Water Conservation Ecological Engineering Consulting Co., Ltd., 100055, Beijing;3.Experimental Forestry Farm, Beijing Forestry University, 100083, Beijing; 4.Institute of Desertification Studies, Chinese Academy of Forestry, 100091, Beijing：China）
Abstract：Kubqi Desert consists mainly of mobile sand dunes. Therefore, Revegetation is necessary to in some key parts such as highway and agricultural or animal husbandry developing areas. This paper studied the spatial pattern of herbaceous plants on typical semi-fixed sand dune using spatial point analysis method. Results show that number variation of perennial Inula salsoloides is greater than that of annual Agriophyllum squarrosum. The general pattern of total plants is basically clumped and becomes less clumped from top to bottom of the sand dune. The relationship of I. salsoloides and A. squarrosum changes from facilitation to competition from top to bottom of sand dune. The main reason for the spatial pattern may result from soil moisture change. A. squarrosum, as a pioneer colonizer, plays an important role in mobile sand dune fixation, hence, seeds of this annual plant should be sprayed for fast revegetation with other non-biological sand-fixation measures during mobile sand dune fixation.
2012, Vol. 10 
