煤矿复垦重构土壤呼吸季节变化特征及其环境影响因子

为了研究采煤沉陷地复垦生态系统土壤呼吸季节特征,探讨各主要环境影响因子对土壤呼吸的影响,利用Li-8100A自动土壤碳通量系统,测定潘一矿复垦区不同季节土壤呼吸速率,同时测定土壤温度、大气温度等环境影响因子。结果表明:1在季节尺度上土壤温度(10 cm)、大气温度和土壤含水率(10 cm)与土壤呼吸速率呈显著正相关。2土壤呼吸速率在日间呈单峰曲线型变化,土壤呼吸速率观测最大值出现在12:00—14:00,观测最小值出现在8:00和18:00两个时间点。土壤呼吸速率均表现出明显的季节变化特征,不同季节具有显著差异。与正常农田观测点数据对比知,大气温度和相对湿度差异不大,土壤呼吸速率、土壤温度和土壤含水率平均值略高于复垦区土壤观测点数据。3潘一矿复垦区重构土壤呼吸的Q10值为1.94,低于暖温带Q10平均值,低于中国土壤呼吸Q10平均值和农田生态系统的Q10平均值。研究结果初步阐明煤矿复垦区重构土壤呼吸的季节变化特征。

Seasonal variation of soil respiration and its environmental effect factors on refactoring soil in coal mine reclamation area

In order to study the seasonal variation of soil respiration in the reclamation ecosystem of coal-mining subsidence and explore the effects of major environmental factors on soil respiration，the soil respiration was measured by using Li-8100A automated soil CO2 flux system in reclamation area of Panyi Coal Mine continuously from January to October in 2012，and environment factors such as soil temperature and atmospheric temperature were also measured at the same time.The results showed that the soil temperature (10 cm)，atmospheric temperature and soil moisture content (10 cm) on seasonal change scale，are positively correlated with soil respiration rate.Soil respiration rate shows unimodal curve type change in the daytime，the maximum occurs between 12：00 and 14：00，while minimum appear at 8：00 and 18：00.The soil respiration rate shows obvious seasonal variation，and different season exhibit significant differences.Compared with normal farmland soil，there is no striking difference between atmospheric temperature and relative humidity.The averages with soil respiration rate，soil temperature and soil moisture content is slightly higher than observation point data in reclamation area soil.The Q10 value of soil respiration is 1.94 in Panyi Coal Mine reclamation area，which is lower than the average value of Q10 in warm temperate zone，terrestrial ecosystem of China and farmland ecosystem.The research preliminarily results illustrate seasonal variation characteristics of refactoring soil respiration in reclamation area.