荒漠-绿洲过渡带不同生境芦苇草地群落土壤含水率与机械组成特征研究

Studyon the soil moisture and soil mechanical composition of Phragmites australis communities in different habitats in Minqin

通过调查民勤白土井的芦苇群落,对盐沼、盐碱地、覆沙地的芦苇群落、土壤机械组成、土壤水分等的空间分布进行分析,结果表明:随着生境不同,芦苇群落的伴生种数量和种类均表现出差异,盐沼地土壤含水率和植被覆盖度最大,物种丰富度最小。3种生境土壤含水率是盐沼>盐碱地>覆沙地。土壤水分决定芦苇生态型,盐沼地分布3种芦苇生态型。3种生境土壤颗粒组成主要以粉粒与沙粒为主,土壤质地以粉沙质壤土与沙质壤土为主,不同生境各层次间土壤机械组成存在差异。

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.