大狼毒主要化感物质对山地草甸土壤磷转化的影响

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中图分类号：S812.6 文献标识码：A 文章编号：1007-0435（2026）04-1205-10

Abstract：To explore the alelopathic mechanism of Euphorbia jolkinii Boiss，adegradation indicator species of mountain meadows in northwest Yunnan，in this study we analyzed its effects on soil phosphorus transformation and related indicators by adding diferent concentrations of 4-Nitrophenol （4-NP）and 2-Phenethylamine（2- PEA）to the soil. The results showed that both alelochemicals significantly increased soil microbial biomass phosphorus，aluminum-bound phosphorus，calcium-bound phosphorus，and moderately reactive organic phosphorus content，decreased pH and iron-bound phosphorus，occluded phosphorus，moderately stable and highly stable organic phosphorus content （ ⋅P<0.05 ），and promoted the proliferation of bacteria and actinomycetes. 4- NPsignificantly enhanced phytase activity and reduced acid phosphatase activity.2-PEA significantly increased acid phosphatase，phytase，and phosphodiesterase activities，while reduced alkaline phosphatase activity （ P< 0.05）.In summary，the addition of 4-NPand 2-PEA directly afects soil physicochemical properties，changes the content of organic and inorganic phosphorus components，indirectly achieves the accumulation of soil nutrients in its rhizosphere environment，and promotes its further expansion.

Key words：Euphorbia jolkini Boiss;Allelochemicals;Mountain meadows;Soil phosphorus transformation

云南省天然草地面积广袤，其在草地畜牧业持续发展及生态安全建设方面发挥着重要的支撑作用[1]。（剩余18583字）