三种土地利用方式下南方高山土壤温室气体通量特征及其影响因子研究

为探讨湖北火烧坪三种土地利用方式下土壤温室气体排放的特征及其影响因子，以研究区农田、草地和天然林地为研究对象，采用野外原位静态箱-气相色谱法对其土壤温室气体通量动态变化进行监测，并对环境因子进行分析。结果表明：三种土地利用方式下土壤CO₂均表现为排放，农田土壤CH₄和N₂O表现为排放，草地表现为吸收，林地不一致；土壤含水量抑制土壤CO₂，促进土壤CH₄产生，过氧化氢酶活性与土壤CO₂和CH₄的排放具有显著相关性，有机肥的施用影响土壤N₂O的排放；全球增温潜势（Global warming potential，GWP）由大到小表现为草地 > 林地 > 农田，但草地由于生物量高光合呼吸作用强，向大气排放CO₂的总量则较低。因此，人工草地的建造有利于降低研究区土壤温室气体的排放。

Research on the Characteristics and Impact Factors of Greenhouse Gas Fluxes in Alpine Soils of Southern China under Three Land Use Patterns

To investigate the characteristics and impact factors of soil greenhouse gas emission under three land use patterns in Huohuping, Hubei Province, the farmland, grassland and natural forest land were taken as the research objects, static chamber-gas chromatographic techniques was used to monitor the soil greenhouse gas flux, and the environmental factors were analyzed in three land use patterns of Huoshaoping, Hubei. The results showed that:soil CO₂ emissions was observed under the three land use patterns, CH₄ and N₂O were emitted in farmland, were absorbed in grassland, and were inconsistent in woodland. Soil water content inhibits CO₂ and promotes CH₄ emissions. Catalase activity had a significant correlation with CO₂ and CH₄ emissions. The application of organic fertilizers affects N₂O emissions. The Global warming potential (GWP) from large to small showed (grassland > woodland > farmland). However, grassland has high photosynthetic respiration due to high biomass, the total amount of net CO₂ emissions in grassland was lower. Therefore, the construction of artificial grassland is conducive to reduce soil greenhouse gas emissions in the study area.