青藏高原绿色农业农田土壤肥力及养分评价

目的]了解青藏高原绿色农业农田土壤养分的变化趋势。方法]对青海省湟中县、湟源县绿色农业农田土壤进行取样,测定土样的pH值和有机质、速效氮、速效磷、速效钾含量,参照青海省农田土壤养分6级分级标准进行评价。结果]湟中县、湟源县的土壤有机质含量相差不大,按养分标准划分,均为3级;速效氮含量基本持平,按养分标准划分,均为3级;速效磷含量均有较大幅度的变化,且湟源县的变化幅度更大,按养分标准划分,均为2级;速效钾含量大于或接近200 mg/kg。结论]青藏高原绿色农业农田土壤pH值在7.62~8.69,有机质、速效氮、速效磷含量均属于中等肥力水平,速效钾含量基本达到了一级高肥力土壤的要求。

Evaluation of Fertility and Nutrient in Farmland Soil from Tibetan Plateau Green Agriculture

Objective] The aim was to understand the change trend of farmland soil nutrient from Tibetan plateau green agriculture.Method]The farmland soils from green agriculture of Huangzhong Country and Huangyuan Country in Qinghai Province were sampled to detect their pH value,contents of organic matter,available N,available P,available K and evaluated with reference to 6 grade standard of farmland soil nutrient of Qinghai Province.Result]The soil organic matter content in Huangzhong Country and Huangyuan Country differed little and they were all graded 3 according to the nutrient standard;their available N content was basically equal and they all belonged to 3 grade according to the nutrient standard;their available P content all had large variation and that in Huangyuan Country had larger variation,they all belonged to 2 grade according to the nutrient standard;their available K content was above or close to 200 mg/kg.Conclusion] The pH value of farmland soil from Tibetan plateau green agriculture was between 7.62 and 8.69,the contents of organic matter,available N,available P all belonged to middle-fertility level and the available K content reached to the demand of 1 grade high-fertility soil basically.