Study on the soil moisture and soil mechanical com-position of Phragmites australis communities in different habitats in Minqin
The Phragmites australis communities and the spatial distribution of soil monistures and soil me-chanical composition in various habitats of saline marsh,saline-alkali land and sandy land in Minqin were stud-ied,The result showed there were difference in the composition and number of companion species in different habitats.The soil moisture and vegetation coverage in salt marsh was the highest,and the richness was the smal-lest.The soil moisture was the highest in saline marsh,followed by that in saline land,and then that in sandy land.The ecotype of Phragmites australis was depend on the soil moisture,and there were 3 ecotypes in saline marsh.The soil particles were mainly composed by silt and sand in 3 habitats,the main soil textures were silty loam and sandy loam,there were differences in the soil mechanical composition of various soil layers in different habitats.