干旱区不同草地土壤植物系统水盐的特征

THE WATER-SALT ATTRIBUTES OF THE GRASSLAND SOIL-PLANT SYSTEMS IN ARID REGION

土壤水盐状况对干旱区草地植物群落的种类组成有直接的影响。本文通过３年对土壤水盐动态（１ｍ土壤含盐量、潜水埋深和矿化度）的定位定点监测，系统地划分出水盐等级指标，并结合草地调查，阐述了不同草地类型与水盐状况的关系，将新疆呼图壁草地生态试验站天然草地划分为沼泽化低地草甸、盐化低地草甸、重盐化低地草甸、盐土荒漠和重盐土荒漠五个亚类。

The soil water-salt attributes as well as its dynamics a direct influence on species composition of plant communities in arid region. According to the measurement of the soil water-salt dynamic(soil salt content up to lm depth, water table and the mineralization degree) and the grassland investigation, a index for characterise the water and salt grades were proposed, and the relationships of the water-salt-plant system in different grassland types were discussed. The natural grassland types near the Grassland Ecology Research Station, Hutubi, Xinjiang, were divided into five forms: marshy lowland meadow, saline lowland meadow, heavy saline lowland meadow, salt desert and heavy salt desert.