Biomass and available soil nutrient of Agropyron mongolicum+Lespedeza davurica pasture

In this study, Agropyron mongolicum and Lespedeza davurica were single sowing, peer mixed sowing and peer mixed sowing in shrub land at Sidunzi experimental base, Yanchi county, Ningxia, to study the effect of sowing methods on pasture biomass and available nutrient distribution of soil. The result showed that aboveground biomass rank from high to low were peer mixed pasture>single sowing A. mongolicum pasture>peer mixed pasture in shrub land>single sowing L. davurica pasture. With the increasing of soil depth, underground biomass and soil available nutrient content showed a decreasing trend. The underground biomass in each 0-40 cm soil layer in single sowing of L. davurica was the least. The content of available N and K was the least in peer mixed pasture, and the content of available P was the least in peer mixed pasture in shrub land, indicate that mixed sowing is not conducive to the accumulation of soil nutrients.