【摘要】 为了揭示草原人工林地潜在的地力衰退趋势,本文采用典型样地调查、土样采集和室内分析相结合的方法,对一家河牧场境内两种不同草原人工林地的土壤养分变化进行了研究,结果表明:各样地除pH值随土层深度增加呈增加趋势外,其余各指标均呈下降趋势;杨树人工林下的A、B两个样地的土壤有机质、全N和速效N含量在2 cm土层中较高;落叶松人工林下的C、D和林缘G 3个样地在各土层中速氮值均较低,而全磷值较高;8个样地的土壤养分含量在60 cm土层中受人工林的营造影响较小;全钾和速效钾的含量受不同人工林的影响不大。更多还原

【Abstract】 In order to reveal grasslands plantations potential soil fertility decline trend,a typical plot investigation was conducted,soil samples were collected with indoor method to study two different plantations and grassland soil nutrient in the Yijiahe rangeland.The results showed that the pH value increased with the soil layer depth increment,but rest indexes descend;the organic content,total N and alkali-hydrolysable nitrogen content of Populus spp plantations plot A and B is higher in the 2 cm soil layer;the alkali-hydrolysable nitrogen of Larix gmelini plantations plots C,D and G are lower in each soil layers,but the total phosphorus value are higher;the plantations construction influence soil nutrient content of 8 plots is small in the 60cm soil layer;the plantations construction influence the content of total potassium and available potassium is not significant.更多还原