Impact of Land Cover on Temperature and Moisture Sensitivity of Soil Organic Matter Mineralization in Subtropical Southeastern China
Impact of Land Cover on Temperature and Moisture Sensitivity of Soil Organic Matter Mineralization in Subtropical Southeastern China
复制标题
DOI：
10.5814/j.issn.1674-764x.2016.02.002
复制
发表时间：
2016-04
影响因子：
--
通讯作者：
Yang Hao;He Nianpeng;Li Shenggong;Y. Guirui;Gao Yang;Wang Ruomeng
中科院分区：
文献类型：
--
作者：
Yang Hao;He Nianpeng;Li Shenggong;Y. Guirui;Gao Yang;Wang Ruomeng
摘要：了解土壤有机质矿化随土地覆被变化的温度和湿度敏感性对于评估全球变化情景下的土壤碳储量至关重要。我们确定的差异，SOM矿化量和温度和水分的敏感性，从六个土地覆盖类型，包括果园，农田，和四个森林，在中国东南部亚热带地区收集的土壤。通过将土壤样品置于培养箱中，研究了SOM矿化对温度（5，10，15，20和25°C）和水分（持水量[WHC]的30%，60%和90%）的响应。果园和农田土壤的碳矿化速率和累积矿化量均高于其他森林土壤。随着温度的升高，土壤C矿化速率和累积C矿化量均随持水力的增加而增加。土壤C矿化的温度敏感性不受土地覆盖类型和培养湿度的影响。所有土壤温度处理表现出类似的响应水分。农田土壤对土壤水分的响应比其他土壤更敏感。研究结果表明，在中国东南部亚热带地区，农田和果园土壤比森林土壤具有更高的CO2排放能力。
Abstract: Understanding the temperature and moisture sensitivity of soil organic matter (SOM) mineralization variations with changes in land cover is critical for assessing soil carbon (C) storage under global change scenarios. We determined the differences in the amount of SOM mineralization and the temperature and moisture sensitivity of soils collected from six land-cover types, including an orchard, a cropland, and four forests, in subtropical southeastern China. The responses of SOM mineralization to temperature (5, 10, 15, 20, and 25°C) and moisture (30%, 60%, and 90% of water-holding capacity [WHC]) were investigated by placing soil samples in incubators. Soil C mineralization rate and cumulative C mineralization were higher in orchard and cropland soils than in other forest soils. With increasing temperature, soil C mineralization rates and cumulative C mineralization increased with the rise of WHC. The temperature sensitivity of soil C mineralization was not affected by land-cover type and incubation moisture. All soil temperature treatments showed a similar response to moisture. Cropland soil was more responsive to soil moisture than other soils. Our findings indicate that cropland and orchard soils have a higher ability to emit CO2 than forest soils in subtropical southeastern China.