大通煤矸石充填复垦区不同植被类型土壤碳排放动态  

Soil Carbon Discharge Dynamics of Different Vegetation Types in Datong Reclamation District Filled with Coal Gangue

作　　者：姚多喜[1,2] 赵魁[1] 张治国[1,2] 杨清[1] 安士凯 张文影[1] 

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南232001 [2]淮南煤炭工程技术研究院生态环境研究室,安徽淮南232001

出　　处：《水土保持通报》2013年第2期30-34,共5页Bulletin of Soil and Water Conservation

基　　金：淮南矿业集团2011年科学技术项目"采煤沉陷区植物再造及碳减排效应研究"(HNKY-JT-JS-2011)

摘　　要：2011年7月至2012年3月,利用LI-8100土壤CO2通量系统测定了淮南市大通煤矸石充填复垦区草地、灌丛、小乔木林、大乔木林土壤呼吸强度及其相关影响因子。结果显示,煤矸石充填复垦区4种植被类型下土壤呼吸强度的昼夜及季节变化均呈单峰曲线形式,最大值出现在夏季的12:00—16:00间,最小值出现在冬季的4:00左右;不同植被类型下土壤呼吸强度差异显著(p<0.05),且土壤呼吸强度有强到弱的顺序呈现:草地>灌丛>小乔木林>大乔木林。4种植被土壤CO2—C年释放通量分别为(999.74±62.26)g/(m2.a),(908.49±72.41)g/(m2.a),(869.22±56.23)g/(m2.a),(726.10±63.01)g/(m2.a),故考虑植被的碳减排效应,在煤矸石充填复垦区可以多种植乔木、灌木,而尽量少植人工草坪;复垦区土壤呼吸除受植被类型影响外,主要受10cm土层土壤温度的影响,各植被类型土壤呼吸强度对土壤温度的指数模型均可以解释88%以上的土壤呼吸变异;草地、灌丛、小乔木林、大乔木林碳排放对温度的敏感性Q10值分别为:2.57,2.71,2.96和3.67。Soil respiration rates as well as soil temperature and moisture for four types of vegetation （grassland, bushes, small arbors, arbors） were monitored with Li-8100 automated soil CO2 flux systems at the reclamation district filled with coal gangue, which is located in Datong district of Huainan City, from July 2011 to March 2012. The results indicated that diurnal variations of soil respiration for the four types of vegetation showed a mode of single peak curve with the maximum value appearing in summer between 12.00 and 16：00 and the minimum value appearing in winter around 4：00 AM. The soil respiration under different vegetation types differed significantly（p〈0.05）, and its rates followed a decreasing order in vegetation types as grass- land, shrubs, small arbors and arbors. The annual emission of soil CO2 for four types of vegetation were 999.74±62.26, 908. 49± 72. 41, 869.22±56.23 and 726.10±63.01 g/（m^2·a）, respectively. Considering the carbon emission reduction effects, arbors, small arbors and shrubs instead of grassland should be planted in the study area. In addition to vegetation types, soil respiration of the area were affected by soil tempera- ture at the depth of 10 cm. The relationship between soil respiration and soil temperature was described well by an exponential equation, which explains more than 88% of the variance of soil respiration. The Q10 （index of sensitvity） values of grassland, bushes, small arbors and arbors were 2.57, 2.71, 2.96 and 3.67 respectively. Keywords. coal gangue; reclamation district; carbon emissions ; vegetation type; soil respiration

关 键 词：煤矸石 复垦区 碳排放量 植被类型 土壤呼吸 

分 类 号：S154.4[农业科学—土壤学]