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森林土壤是CO2、CH4和N2O等温室气体的主要排放源.本研究采用静态箱/色谱分析技术,对中国科学院鹤山丘陵综合开放试验站内厚荚相思林土壤CO2、CH4和N2O通量进行原位测定,研究剔除林下灌草和添加翅荚决明对土壤温室气体排放的影响.结果表明:厚荚相思林土壤CO2通量在湿季维持较高水平,在旱季则明显降低.CH4和N2O在9—11月波动幅度较大,峰值出现在10月.在不同处理下,厚荚相思林土壤可能是CH4的源也可能是CH4的汇,而于CO2和N2O则是源.林下剔除灌草能显著增大土壤CO2排放(P<0.05),而添加翅荚决明能加快土壤CH4的排放(P<0.05).林下剔除灌草及添加翅荚决明两种处理都能够加大N2O的排放通量.表层土壤温度、湿度、NO3--N和微生物生物量碳都是影响土壤温室气体排放的重要因子.
Forest soil is the main source of greenhouse gases such as CO2, CH4 and N2O. In this study, the static CO2 / CH4 and N2O fluxes of Acacia crassicarpa Habitat in Heshan Hilly Comprehensive Experimental Station of Chinese Academy of Sciences The results showed that: the soil CO2 fluxes of Acacia crassicarpa maintained a high level in wet season, but significantly decreased in dry season.CH4 and N2O And the peak appeared in October from September to November. Under different treatments, the soil of Acacia crassicarpa may be the source of CH4 or the sink of CH4, and the source of CO2 and N2O. Shrubs significantly increased soil CO2 emissions (P <0.05), while addition of Cassia toxins accelerated soil CH4 emissions (P <0.05). Both shrubs and shrubs were able to add Large N2O fluxes Topsoil temperature, humidity, NO3 - N and microbial biomass carbon are both important factors affecting soil greenhouse gas emissions.