亚热带杉木林土壤有机碳及其活性组分对氮磷添加的响应

发布时间：2018-04-13 01:09

本文选题：氮沉降 + 磷添加　；参考：《应用生态学报》2017年02期

【摘要】：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.
[Abstract]:The results showed that the addition of nitrogen and phosphorus had no significant effect on the content of SOC in 0 ~ 20 cm soil layer.P addition significantly decreased the content of POC in 0 ~ 5 cm soil layer. Compared with non-phosphorus treatment, the POC content of P treatment decreased to nitrogen content. The response of phosphorus addition was mainly in 0 ~ 5 cm soil layer, and low level nitrogen addition and phosphorus addition significantly increased WSOC content.In 0 ~ 5 cm soil layer, nitrogen addition had no significant effect on POC/SOC value, but compared with no phosphorus addition, POC / SOC value was significantly decreased by 15.9% under phosphorus addition treatment.The addition of nitrogen and phosphorus had no significant effect on the POC/SOC value in the 5 ~ 10 and 10 ~ (10) ~ (20) cm soil layers.In the subtropical region, the carbon stability of forest soil is mainly controlled by phosphorus content. Short-term phosphorus addition can easily lead to the decomposition of active organic carbon in surface soil and increase soil carbon stability.
【作者单位】：江西农业大学林学院江西特色林木资源培育与利用2011协同创新中心;中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室千烟洲生态试验站;
【基金】：国家重点研发计划项目(2016YFD0600202-2) 国家自然科学基金项目(31360179,31160107)资助~~
【分类号】：S714.2

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