The Traits Of Plant Community Diversity And Aboveground Biomass Of The Habitat Gradient From South-facing Slope To North-facing Slope

As an indirect environmental factor, slope plays an important role in causing the difference of species composition and structure of community diversity. Meanwhile it has an important impact on community diversity, growth, vegetation styles, productivity and the function of ecosystem via changing the environmental factors, such as illumination, temperature, moisture and so on. Therefore, it is significant to study the relationship between plant distributing and slope.This study sites choose the natural grass of Lanzhou University, alpine meadow and wetland ecosystem research station (Hezuo City and Maqu county) in Gansu Province.The research on the environmental factors form South-facing slope to North-facing slope showed that:The average value of the illumination and soil temperature was that:South-facing slope>West-facing slope>North-facing slope. In some specific time points of the illumination and changes in soil temperature, generally as follows: South-facing slope>West-facing slope>North-facing slope. Soil moisture increased from South-facing slope to North-facing slope in both 0-15cm and 15-30cm layers. The varieties in soil nutrients were more complex, in 0-15cm of soil, total N, available N, available P and organic matter content changes were that:South-facing slope