毛乌素沙地盐池地区固定沙丘主要固沙灌木的空间分布格局与空间关联性研究

Spatial distribution pattern and spatial correlation of main sand-fixing shrubs in fixed dunes in Yanchi region,Mu Us sandy land

种群的空间分布格局与关联性的研究对预测种群的演替趋势和植被重建具有重要意义。基于毛乌素沙地固定沙丘上固沙灌木的地理位置和生长发育阶段数据,采用单变量、双变量成对相关函数和Monte-Carlo拟合检验方法,对油蒿(Artemisiaordosica)、杨柴(Hedysarummongolicum)和柠条(Caraganakorshinskii)三种优势种群进行空间分布格局和关联性分析。结果表明:(1)三个种群在小尺度下呈现聚集分布,大尺度下呈现随机或均匀分布;杨柴和柠条种群在研究尺度范围内主要表现为聚集分布。(2)种间关系表明:油蒿和杨柴在小于5 m尺度下负相关,其他尺度下基本不具有相关性。(3)种群不同生长发育阶段之间的种内关联关系表明:在小尺度下,3个种群的种内关系基本呈正相关;在大尺度下,油蒿种内关系呈负相关,杨柴和柠条的种内关系不存在相关性。

The purpose of this research on the spatial distribution pattern and correlation of populations is to predict the succession trend of populations and vegetation reconstruction which has a great significance meaning for further research investigation.Based on the geographic location and growth stage data of sand-fixing shrubs on fixed sand dunes in the Mu Us Sandy Land,the spatial distribution pattern and correlation of three dominant populations of Artemisia ordosica(AO),Hedysarum mongolicum(HM)and Caragana korshinskii(CK)were analyzed by using univariate and bivariate paired correlation functions and Monte Carlo fitting test.The results are as follows.(1)The three populations were aggregated at small scale and randomly or uniformly distributed at large scale;the populations of HM and CK showed aggregation distribution within the spatial scale of the study.(2)The interspecies relationships showed that AO and HM were negatively correlated at the scale less than 5 meters and basically uncorrelated at other scales.(3)The intraspecific correlation among different growth and development stages of the populations showed that the intraspecific relationships of the 3 populations were basically positively correlated at small scales.At large scales,there was a negative correlation between the intraspecifc relationships of AO,while there was no correlation between the intraspecifc relationships of HM and CK.