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