采煤塌陷地不同复垦方式下土壤有机碳的恢复速率研究  

Study on the recovery rate of soil organic carbon under different reclamation modes in coal mining subsidence area

作　　者：李奇超 蔡德水[3] 李新举 闵祥宇[1,2] 肖杨 LI Qichao;CAI Deshui;LI Xinju;MIN Xiangyu;XIAO Yang(National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Tai’an 271018,China;College of Resources and Environment,Shandong Agricultural University,Tai’an 271018,China;The Bureau of Land and Resource Jining City,Jining 272017,China)

机构地区：[1]土肥资源高效利用国家工程实验室,山东泰安271018 [2]山东农业大学资源与环境学院,山东泰安271018 [3]济宁市国土资源局,山东济宁272017

出　　处：《河南农业大学学报》2018年第4期625-631,共7页Journal of Henan Agricultural University

基　　金：国家自然科学基金项目(41771324);山东省重点研发计划(重大关键技术)(2016ZDJS11A02)

摘　　要：以济宁采煤矿区中充填复垦区、挖深垫浅区和区域调平区的土壤为研究对象,研究不同复垦方式下土壤有机碳(SOC)的恢复速率。运用元素分析仪和同位素质谱仪测定土样SOC含量、常量元素(全碳(TC)、全氮(TN)、全氢(TH)、全硫(TS))和稳定性碳同位素(δ13C)。结果表明,(1)在0~60 cm土层间,3种复垦土壤的SOC均值均小于各自对照耕地,在不同土层深度(0~20、20~40、40~60 cm)间,复垦土壤的SOC含量均显著(P<0.05)小于相应对照(挖深垫浅区在40~60 cm和区域调平区在0~20 cm除外)。(2)充填复垦区的SOC、TC和TN含量与对照相比均偏低,TS含量和C/N比显著偏高,挖深垫浅区和区域调平区的TC、TN、TH、TS含量和C/N比与对照基本保持一致。(3)通过lg SOC与δ13C的周转模型得出3种复垦土地的SOC恢复速率差异明显(P<0.05),不同复垦方式会对不同深度土层间的δ13C造成不同程度的扰动,对覆土层土壤层次的扰动程度越小,有机碳的恢复速率就越快。因此,相对于充填复垦方式,非充填复垦方式对土壤的扰动更小,SOC的含量更高,恢复速率更快。The recovery rate of soil organic carbon(SOC)under different reclamation modes was studied by taking the soils in the mining areas of Jining as the research object,including the filling reclamation area,the deeping-digging and shallow-filling area,and the land leveling area.The content of SOC,major elements like total carbon(TC),total nitrogen(TN),total hydrogenTH,total sulfur(TS)and stable carbon isotopes in the soil samples were determinedby the element analyzer and the isotope mass spectrometer.The results showed that(1)in the 0~60 cm soil layer,the average SOC content in the three types of reclaimed soils was lower than that in their respective control cultivated land.In different soil depths(0~20,20~40,40~60 cm),the SOC content in the reclaimed soil was significantly(P<0.05)lower than that in the control soil(except for the soil depths of 40~60 cm in the deeping-digging and shallow-filling areas and depths of 0~20cm in the land leveling areas);(2)The contents of SOC,TC and TN in the filling reclamation area were lower than those in the control area,while the contents of TS and C/N were significantly higher than those in the control areaThe contents of TC,TN,TH,TS and C/N ratio in the shallow zone and the levelling zone were basically consistent with those in the control group(3)It can be concluded that the SOC recovery rates of the three reclaimed lands were significantly different(P<0.05)according to the lgSOC andδ13 C turnover model.Different reclamation modes would cause different degrees of disturbance toδ13 C between different depths of soil layers.The smaller the disturbance degree of the soil layer was,the faster the recovery rate of SOC was.Therefore,compared with the filling reclamation modes,the non-filling reclamation modes had less disturbance to the soil,higher SOC content and faster recovery rate.

关 键 词：复垦方式 有机碳 常量元素 稳定碳同位素 恢复速率 

分 类 号：TD88[矿业工程—矿山开采] S151.9[农业科学—土壤学]