格姆滩“黑土滩”退化草地植物量和土壤水分研究

通过对格姆滩“黑土滩”退化草地和中度退化草地植物量和土壤水分的研究，结果表明：“黑土滩”退化草地植物群落以阏叶型杂类草为主，中度退化草地以莎草科为主。地上总植物量“黑土滩”退化草地〉中度退化草地。0—30cm地下总植物量“黑土滩”退化草地〈中度退化草地。两样地0～20cm土层土壤含水量变化趋势总体上为先增高，后降低。各个时期土壤各层及平均含水量均为中度退化草地〉“黑土滩”退化草地。0—20cm土壤水分垂直变化“黑土滩”退化草地总体上随土层深度的增加而增大，中度退化草地随土层深度的增加而减小。

Study on Biomass and Soil Moisture of Black Soil Beach Degraded Grassland in Gemutan

Biomass and soil moisture of＂Black Soil Beach＂ degraded grassland and moderately degraded grassland in Gemutan was determined. The results showed that forbs are dominant species in the plant community of＂ Black soil Beach＂degraded grassland, sedges are dominant species in moderately degraded grassland. Total aboveground biomass on＂Black Soil Beach＂degraded grassland is greater than that of moderately degraded grassland. Total underground biomass at 0 - 30cm depth on ＂Black Soil Beach＂ degraded grassland is smaller than that of moderately degraded grassland. Soil moisture at 0- 20cm depth in two plots tends to increase first then decrease. In each period,each soil layer and average moisture on moderately degraded grassland are greater than that of ＂Black Soil Beach＂ degraded grassland. Soil moisture at 0 - 20cm depth change as verticality, with increasing of soil depth, soil moisture also increasing generally for＂black soilbeach＂degraded grassland, but decreasing for moderately degraded grassland.