氮肥及硝化抑制剂配合施用对石灰性土壤二氧化碳释放的影响
发布时间：2019-01-10 13:05
【摘要】：为研究施用氮肥对同时含有有机碳及无机碳石灰性土壤碳释放的影响,在陕西杨凌进行田间试验,比较了不同施氮量(0、160、220 kg·hm~(-2))及其与硝化抑制剂(DCD)配合(N160、N220及N160+DCD、N220+DCD)对土壤pH值、矿质态氮含量和二氧化碳(CO_2)释放量的影响。结果表明:施用氮肥显著降低了耕层土壤pH;配施DCD后土壤pH降低幅度小于未加DCD处理;加入DCD使氮肥的硝化过程推迟了约20 d;未加DCD处理的土壤CO_2释放量随施氮量增加而增加,试验结束时(施肥37 d后)土壤CO_2累积释放量最高达到167.1 g·m~(-2)。与N0处理相比,N160和N220处理的土壤CO_2累积释放量显著增加,增幅分别为20.9%和25.7%;N160+DCD和N220+DCD处理显著降低了土壤CO_2累积释放量,比对应相同施氮量处理分别降低了13.5%和11.0%。上述结果说明施用氮肥会同时影响石灰性土壤有机碳及无机碳的释放,施用氮肥引起的土壤无机碳的释放值得关注。
[Abstract]:In order to study the effect of nitrogen fertilizer application on carbon release from calcareous soil containing both organic and inorganic carbon, a field experiment was conducted in Yang Ling, Shaanxi Province, to compare different nitrogen rates (0160220 kg hm~ (-2) and their combinations with nitrification inhibitor (DCD) (N160). The effects of N220 and N160 DCD,N220 DCD on soil pH value, mineral nitrogen content and CO_2 emission were investigated. The results showed that the reduction of soil pH was significantly lower after applying nitrogen fertilizer than that without DCD, and the nitrification process of nitrogen fertilizer was delayed by about 20 days. The amount of CO_2 released from the soil without DCD treatment increased with the increase of nitrogen application. The cumulative release of CO_2 reached the highest level of 167.1 g m2 at the end of the experiment (37 days after fertilization). Compared with N0 treatment, the cumulative release of CO_2 in N160 and N220 treatments was significantly increased by 20.9% and 25.775%, respectively. N160 DCD and N220 DCD treatments significantly reduced the cumulative release of soil CO_2, and decreased the cumulative release of CO_2 by 13.5% and 11.0%, respectively, compared with the corresponding nitrogen application treatments. The results indicated that nitrogen fertilizer could affect the release of organic and inorganic carbon from calcareous soil, and the release of inorganic carbon from calcareous soil should be paid more attention to.
【作者单位】： 西北农林科技大学资源环境学院;农业部西北植物营养与农业环境重点实验室;
【基金】：国家自然科学基金项目(41671295,31372137) 国家“十二五”科技支撑计划课题(2012BAD15B04)~~
【分类号】：S143
[Abstract]:In order to study the effect of nitrogen fertilizer application on carbon release from calcareous soil containing both organic and inorganic carbon, a field experiment was conducted in Yang Ling, Shaanxi Province, to compare different nitrogen rates (0160220 kg hm~ (-2) and their combinations with nitrification inhibitor (DCD) (N160). The effects of N220 and N160 DCD,N220 DCD on soil pH value, mineral nitrogen content and CO_2 emission were investigated. The results showed that the reduction of soil pH was significantly lower after applying nitrogen fertilizer than that without DCD, and the nitrification process of nitrogen fertilizer was delayed by about 20 days. The amount of CO_2 released from the soil without DCD treatment increased with the increase of nitrogen application. The cumulative release of CO_2 reached the highest level of 167.1 g m2 at the end of the experiment (37 days after fertilization). Compared with N0 treatment, the cumulative release of CO_2 in N160 and N220 treatments was significantly increased by 20.9% and 25.775%, respectively. N160 DCD and N220 DCD treatments significantly reduced the cumulative release of soil CO_2, and decreased the cumulative release of CO_2 by 13.5% and 11.0%, respectively, compared with the corresponding nitrogen application treatments. The results indicated that nitrogen fertilizer could affect the release of organic and inorganic carbon from calcareous soil, and the release of inorganic carbon from calcareous soil should be paid more attention to.
【作者单位】： 西北农林科技大学资源环境学院;农业部西北植物营养与农业环境重点实验室;
【基金】：国家自然科学基金项目(41671295,31372137) 国家“十二五”科技支撑计划课题(2012BAD15B04)~~
【分类号】：S143
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