Changes of organic C, N and P in rhizosphere soil under various dominant tree species in karst rocky desertification area
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摘要: 通过对贵州中部喀斯特石漠化区典型植被及土壤进行调查,探讨森林退化过程中不同群落优势树种根际土壤有机碳及氮磷含量的变化。结果表明:根际土壤有机碳及氮磷含量均高于非根际土壤;在不同植被类型之间,林木根际对土壤有机碳及氮磷的累积效应存在明显的差异性,其中土壤有机碳的累积效应表现最明显,其次是土壤磷素,而土壤氮素累积效应的差异性较小。在树木根基0～30cm水平范围内,根际土壤总有机碳、易氧化有机碳、全氮、有效氮和有效磷含量都明显高于30～90cm外围根际区。不同群落优势树种之间,根际土壤碳及氮磷总量的差异性表现为总有机碳＞全氮＞全磷,而碳及氮磷的生物有效态含量则表现为有效磷＞易氧化有机碳＞有效氮。森林退化过程中,群落优势树种根际土壤总有机碳、易氧化有机碳及有效磷含量出现显著的下降,从而明显地影响土壤的肥力水平。Abstract: The changes of organic carbon, nitrogen and phosphorus in rhizosphere soil under different dominant tree species in the process of forest degradation are estimated by investigating various vegetations and soils in karst rocky desertification region in Guizhou Province. The results show that the contents of organic C, N and P in rhizosphere soil are significantly higher than that in the bulk of soil. There is obvious difference in the enrichment ratio of organic C, N and P under different vegetation covers in rhizosphere soil. Among them, organic C has the strongest enrichment effect, P the second and N third.In0～30cm scope of the tree rhizosphere soil, the concentrations of total organic C, easily oxidizable C, total N, available N, total P and available P are higher than thatin30～90cm.The difference of total amount is total organic C＞total N＞total P in rhizosphere soils while the difference of available amount is available P＞easily oxidizable C＞available N. During the process of forest degradation, the concentrations of total organic C, easily oxidizable C and available P in rhizosphere soil under different dominant tree species have decreased obviously so affected significantly the soil fertility.
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Key words:
- karst rocky desertification /
- dominant tree species /
- rhizosphere soil /
- organic carbon /
- nitrogen /
- phosphorus
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