大狼毒种群扩散增殖对滇西北亚高山草甸土壤养分及微生物特性的影响

Effect of Euphorbia jolkinii Boiss Proliferation on the Soil Nutrients and Microbial Characteristics of Subalpine Meadow in Northwest Yunnan

【目的】探讨毒害草扩散蔓延区草地的适应性管理策略。【方法】以大狼毒分盖度分别为5.4%、20.8%和45.5%的滇西北退化亚高山草甸为研究对象,开展大狼毒种群扩散增殖对草地土壤碳、氮、磷含量及微生物数量的影响研究。【结果】随着大狼毒分盖度由5.4%增加至45.5%,滇西北亚高山草甸0~10和>10~30 cm土层有机碳、速效氮、全磷、速效磷、微生物量碳、氮和磷含量以及细菌、真菌和放线菌数量均显著增加(P<0.05)。【结论】大狼毒种群在草地中的扩散增殖有利于草地土壤养分的转化和肥力状况的改善,良好的土壤状况促进了土壤微生物的生长繁殖。

[Purpose]In order to explore the adaptive management strategy of grassland in the spreading area of poisonous plants.[Method]The degraded subalpine meadow with different coverage(5.4%,20.8%and 45.5%)of Euphorbia jolkinii Boiss were chose,and the effects of proliferation of E.jolkinii on soil carbon,nitrogen,phosphorus and microbial quantity of degraded subalpine meadow in Northwest Yunnan were studied.[Result]The contents of organic carbon,available nitrogen,total phosphorus,available phosphorus,microbial biomass carbon,nitrogen and phosphorus,and the number of bacteria,fungi and actinomycetes in 0-10 cm and>10-30 cm soil layers were significantly increased with the coverage of E.jolkinii increasing from 5.4%to 45.5%(P<0.05).[Conclusion]The diffusion and proliferation of E.jolkinii in grassland is conducive to the transformation of soil nutrients and the improvement of soil fertility.Good soil conditions promote the growth and reproduction of soil microorganisms.