摘要:使用化学除草剂防除狼毒能有效遏制狼毒种群的扩张，对于防除狼毒后狼毒斑块的植被和土壤生态化学计量特征的研究鲜有报道。基于此，本研究运用生态化学计量学的原理、方法，以分枝数相同的单株狼毒（Stellera chamaejasme）斑块为研究对象，通过化学药剂防除狼毒后，分析狼毒斑块内外植物-土壤C、N、P含量及其比值的变化，探讨植物和土壤化学计量特征的内在联系以及狼毒斑块的养分循环规律，为狼毒型退化草地的生态恢复及利用提供参考。结果表明：防除狼毒后禾本科生物量有所增加，豆科和杂类草地上生物量显著低于狼毒斑块内（P<0.05）。不同狼毒斑块的豆科植物N含量和杂类草P含量最高，防除狼毒后植物C、N含量高于其他斑块；禾本科P含量为狼毒斑块外显著高于狼毒斑块内（P<0.05）；狼毒斑块内外莎草科C∶N显著高于防除狼毒（P<0.05）；莎草科和豆科C∶P和N∶P为防除狼毒显著高于狼毒斑块内和狼毒斑块外（P<0.05），杂类草C∶P和N∶P为防除狼毒显著高于狼毒斑块外（P<0.05），禾本科C∶P为狼毒斑块内显著高于防除狼毒和狼毒斑块外（P<0.05）。不同狼毒斑块土壤C、P含量以及C∶P表现为狼毒斑块内>狼毒斑块外>防除狼毒，N含量和N∶P为防除狼毒>狼毒斑块内>狼毒斑块外，C∶N表现为狼毒斑块内和狼毒斑块外显著高于防除狼毒（P<0.05）。冗余分析（RDA）结果显示植物与土壤的C，C∶N，C∶P，N∶P两两显著正相关，N，P两两显著负相关，且防除狼毒后对植物和土壤的N含量，N∶P以及植物P含量影响较大。



Abstract:The use of chemical herbicides is considered the effective methods to control the expansion of Stellera chamaejasme. Limited studies have been conducted on the vegetation and soil ecological stoichiometric characteristics of S. chamaejasme patches after removing S. chamaejasme. Therefore, the ecological stoichiometry of plant and soil C, N, P content and their ratios of different S. chamaejasme patches after removing S. chamaejasme by chemical herbicides were analyzed by selecting the same number of branches of S. chamaejasme using the principles and methods of ecological stoichiometry. In order to provide the reference for ecological restoration and utilization of degraded grassland of S. chamaejasme, we explored the interaction of plant and soil stoichiometric characteristics and nutrient circulation of S. chamaejasme patches. The results showed that the biomass of Gramineae increased after removing S. chamaejasme and the biomass of Leguminosae and Forbs were significantly lower than that within the S. chamaejasme patch (P<0.05). N content of Leguminosae and P content of Forbs were the highest with different patches, and plant C, N content of removing S. chamaejasme were higher than that of other patches. P content of Gramineae was significantly higher outside the S. chamaejasme patch than within the S. chamaejasme patch (P<0.05). The outside and within the S. chamaejasme patch C∶N of Cyperaceae were significantly higher than that of removing S. chamaejasme (P<0.05). The Cyperaceae and Leguminosae C∶P and N∶P of removing S. chamaejasme were significantly higher than that of outside and within the S. chamaejasme patch (P<0.05), forbs of removing S. chamaejasme was significantly higher than that of outside the S. chamaejasme patch (P<0.05), and C∶P of Gramineae of within the S. chamaejasme patch was significantly higher than that of removing S. chamaejasme and outside the S. chamaejasme patch (P<0.05). The C, P content and C∶P of soil in different S. chamaejasme patches were within the S. chamaejasme patch > outside the S. chamaejasme patch > removing S. chamaejasme, and N content, N∶P were removing S. chamaejasme > within the S. chamaejasme patch > outside the S. chamaejasme patch. The soil C∶N of within and outside the S. chamaejasme patch were significantly higher than that of removing S. chamaejasme (P<0.05). The redundancy analysis (RDA) showed that the plant and soil C, C∶N, C∶P, N∶P were significantly positive correlation, while N, P were significantly negatively correlation. After removal S. chamaejasme, the N content, N∶P and P content in plants and soil had a greater effect.





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