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通过野外氮、磷添加,分析N_0(0 kg N·hm~(-2)·a~(-1))、N_1(50 kg N·hm~(-2)·a~(-1))、N_2(100 kg N·hm~(-2)·a~(-1))、P(50 kg P·hm~(-2)·a~(-1))、N_1P和N_2P等6种处理3年后对亚热带杉木人工林土壤有机碳(SOC)、颗粒有机碳(POC)和水溶性有机碳(WSOC)的影响.结果表明:氮、磷添加对0~20 cm土层SOC含量无显著影响.磷添加显著降低0~5 cm土层POC含量,与无磷处理相比,加磷处理POC含量降低26.1%.WSOC含量对氮、磷添加的响应主要表现在0~5 cm土层,低水平氮添加和磷添加显著提高WSOC含量.在0~5 cm土层,氮添加对POC/SOC值无显著影响,而与无磷添加相比,POC/SOC值在磷添加处理下显著降低15.9%.在5~10和10~20 cm土层,氮、磷添加处理对POC/SOC值无显著影响.在亚热带地区,森林土壤碳稳定性主要受磷含量的调控,短期磷添加易导致表层土壤活性有机碳分解,增加土壤碳稳定性.
N 0 (0 kg N · hm -2 · a -1) and N 1 (50 kg N · hm -2 · a -1) were analyzed by adding nitrogen and phosphorus in the field. N 2 (100 kg N · hm -2 · a -1), P (50 kg P · hm -2 · a -1), N 1 P and N 2 P 3 Year on the soil organic carbon (SOC), particulate organic carbon (POC) and water-soluble organic carbon (WSOC) in subtropical Chinese fir plantation.The results showed that there was no significant effect of nitrogen and phosphorus addition on the SOC content of 0-20 cm soil layer Compared with the non-phosphorus treatment, the POC content in the 0-5 cm soil layer decreased by 26.1%, while the POC content in the 0-5 cm soil layer decreased by 26.1% .The response of WSOC content to 0-5 cm soil layer was mainly in 0-5 cm soil layer, Nitrogen addition and phosphorus addition significantly increased the content of WSOC, while POC / SOC had no significant effect on 0-5 cm soil layer, POC / SOC decreased by 15.9% compared with non-phosphorus addition %. At 5 ~ 10 and 10 ~ 20 cm depths, POC / SOC did not significantly affect the N and P additions in the soils, but in the subtropical areas, the carbon stability of forest soils was mainly controlled by P content. Short- Soil active organic carbon decomposes and increases soil carbon stability.