乌江中上游流域土壤CO_(2)排放及其影响因素

Soil CO_(2) Emission and Factors in the Middle and Upper Reaches of Wujiang River Basin

本研究以我国贵州喀斯特地区洪家渡水库为对象,研究表明在原状土柱培养中,不同土地利用类型林地(LD)、草地(CD)、耕地(GD)CO_(2)的排放量存在差异。其中,林地>草地>耕地,土壤中CO_(2)排放主要受到SON、DOC、NO_(3)^(-)-N的影响,其中土壤有机氮可解释土壤CO_(2)通量的69.2%。因此,减少氮肥的输入,有助于构建绿色低碳循环发展的现代经济体系,实现城市能源可持续发展。

This study is based on the Hongjiadu Reservoir in karst region of Guizhou Province in China and showed that CO_(2) emissions of forest land(LD),grassland(CD)and arable land(GD)were different among different land use types in undisturbed soil column cultivation.Woodland>Grassland>cultivated land,soil CO_(2) emission was mainly controlled by SON,DOC and NO_(3)^(-)-N conditions,and soil organic nitrogen could explain 69.2%of soil CO_(2) flux.Therefore,reducing the input of nitrogen fertilizer is conducive to building a modern economic system of green,low-carbon and circular development and realizing sustainable development of urban energy.