高寒草地主要类型土壤因子特征及对地上生物量的影响

The Character of Soil Factors of the Main Community in High and Cold Grasslands and Influence on Ground Biomass

以新疆巴音布鲁克高寒草地五种主要草地类型的实测数据为依据,探讨了土壤因子随环境变化的特点及其对地上生物量之间的影响。结果表明:沼泽高寒草甸土壤含水量最大,有机质和速效N、P、K的含量都最高。高寒草原土壤含水量最小,有机质和速效养分的含量最低。土壤含水量与速N存在显著正相关,速P与速N和速K之间分别存在显著正相关,速K和有机质存在显著正相关。土壤含水量和速N含量是影响地上生物量的主要土壤因子,回归方程分别为Y=379.954X+28.238(F=12.562,P<0.05)和Y=0.864X-122.874(F=21.352,P<0.05)。

Based on the measured data of five main kinds of the high and cold grasslands in Bayanbulak Xinjiang, the characteristics of soil factors with environmental variations and the relationship between soil factors and above - ground biomass of the grasslands were studied in this paper. The results showed that among five kinds of grasslands, the soil moisture of the swampy meadow is the highest and its organic matter and available N, P, K also are the highest; However, in the high and cold prairie, the soil moisture is the lowest, and the organic matter and the available nutrients are the lowest. The soil moisture and available N have the remarkable positive correlation; the correlations between available N,P, K and organic matter are all remarkable positive. The soil moisture and available N are the main factors that influence grassland above - ground biomass, the regression equation are Y = 379.954X＋28.238 （F=12.562, P〈0.05） and Y=0.864X-122.874 （F=21.352, P〈0.05）.