三江源区矮生嵩草草场冷暖两季土壤养分研究

摘要

[Objective] The research aimed to get know of the content of soil nutrients in Kobresia humilis meadows in cold season and warm season in the region of Yangtze River, Yellow River and Lantsang River. [ Method ] The content of soil nutrients in Kobresia hamilis meadows in cold season and warm season in the region of Yangtze River, Yellow River and Lantsang River were determined. [ Result] The average content of organic matter in 0 - 5 cm soil in cold season and warm season were 235.78 and 236. 74 g/kg respectively. The average content of organic matter in 5 - 10 cm soil in cold season and warm season were 145. 39 and 152. 92 g/kg respectively, which are higher than high fertility (15 mg/kg). The average value of pH in 0 - 5 cm soil and 5-10 cm soil in two seasons were 6. 88, 6. 72, 6.85, 6. 87 respectively. The total nitrogen content in 5 - 10 cm soil and 5-10 cm soil in two seasons were all higher than 0. 2% . The average phosphorus content in 5 - 10 cm soil and 5-10 cm soil in cool season were 0. 011 6% and 0.009% respectively. The average phosphorus content in 5 - 10 cm soil and 5 - 10 cm soil in warm season were 0. 117% and 0. 111% respectively. The total phosphorus content in cold season was lower than the national level. The average content of available phosphorus in cold-season and warm - season in soil were 5. 15 and 6.49 mg/kg respectively. Soil a-vailable sulfur content was more than 24 mg/kg. [Conclusion] The content of organic matter in soil of Kobresia humilis meadows in cold season and warm season in the region of Yangtze River, Yellow River and Lantsang River was rich, texture was fertile, weak acid soil was favorable for improving the effectiveness of iron. And the content of total nitrogen and effective sulfur were rich and the available P content was medium.%[目的]初步掌握三江源区冷暖两季矮生嵩草草场土壤养分的含量.[方法]对三江源区矮生嵩草草场冷暖两季土壤养分含量进行测定.[结果]冷暖两季0～5 cm土壤平均有机质含量为235.78和236.74 g/kg;5～10 cm土壤平均有机质含量分别为145.39和152.92g/kg,均高于高肥力(15 g/kg).冷暖两季0～5 cm 、5～10cm土壤平均pH为6.88、6.72、6.85、6.87.冷暖两季0～5 cm、5 ～10cm土壤全氮含量均高于0.2％.冷季0～5 cm、5～ 10 cm平均磷含量为0.011 6％和0.009％;暖季0～5 cm、5～10 cm平均磷含量为0.117％和0.111％,冷季土壤全磷含量均低于全国水平.三江源区矮生嵩草草场冷暖两季土壤平均速效磷含量分别为5.15和6.49mg/kg.土壤有效硫含量大于24 mg/kg.[结论]三江源区冷暖两季矮生嵩草草场土壤有机质含量丰富,质地肥沃,弱酸性土壤有利于提高铁的有效性,土壤全氮、有效硫含量丰富,速效磷含量中等.