Research On The Bioecological Characteristics Of Spatial Distribution Pattern Of Ceratoides Ewersmanniana In The Southern Edge Of Mosuowan Desert

Population spatial distribution pattern is the result of long adaptation and selection between the biological characteristics and environment, it can be used to analyze the relationships on the trait of population, interspecific and intraspecific connection, and population and environment. The southern edge of Mosuowan desert is a southern branch of Guerbantonggute desert. The vegetation stabilization of the district affect the ecological environment of neighbouring cities. So we studied the vegetation distribution and distribution pattern of dominance shrub, we aimed to discover the interaction of species and environment, and provided the theoretics base to the protection and recovery, then we can explore and develop the grazing-Ceratoides ewersmanniana. The results as following:(1)Appling the semi-variance analysis and choosing 4 kinds of shrubs of higher important values, the results of pattern indicated: Ceratoides ewersmanniana, Haloxylon ammodendron, Reaumuria soongorica belonged to cluster distribution pattern in different degree in three plots, these might have something with the growth characteristics, propagation and diffusion of the plant itself, and meanwhile, these properties might limited by the severe environment, so the seed diffusion relied on the matrix, and in the center of matrix; Colligonum leucocladwn(Schrenk Bge) belonged to random distribution in scatter.(2)Appling the Ripley's K(d) function of point pattern, the result showed: the patterns of Ceratoides ewersmanniana had varied in different scale, and the variation were different in the three plots; Haloxylon ammodendron, Reaumuria soongorica, Colligonum leucocladwn were mainly cluster distribution in three plots. The result of interspecies association analysis found: there were no interspecies association between Ceratoides ewersmanniana and Haloxylon ammodendron in 1and 2 plot, only in 3 plot, which is in the sand hinterland, there were weak association from 0 to 50 meter. There were complex relationship between Ceratoides ewersmanniana and Reaumuria soongorica for the reason of their same habitat, showing positive and minus association in three plots.(3)According to the analysis of distribution and environment about Ceratoides ewersmanniana, it mainly distributed on the desert steppe of sand bottom and sand dune, which had higher water content and organic matter, and higher pH and conduction ratio; Haloxylon ammodendron distributed on the sand top; Reaumuria soongorica mainly distributed on the low-lying of sand bottom, which had the highest pH and conduction ratio. We found the key factors affected species distribution were the shape and position of slope, the weak interaction of species was secondary in all factors.(4)We found the similar pattern of big and young plants of Ceratoides ewersmanniana in three plots, which belonged to cluster pattern, and had connection with the mechanism of seed diffusion. From the transitional oasis zone to the hinterland in the sand, there were increased numbers of regeneration seedlings, which might reflect the increased trend and well adaptation to the sand habitat.Based on the result of relationships between pattern and environment, we proposed some measure to protect the desert vegetation, we can match Ceratoides ewersmanniana and Haloxylon ammodendron in the sand dune and top, match Ceratoides ewersmanniana and Reaumuria soongorica in the sand bottom and dune, on the base of cluster pattern of one's own, then we can make use of the ecological function of vegetation, and develop the good grazing further and scientifically.