时间序列下煤矸石充填复垦耕地和林地的土壤碳动态特征  

Soil carbon dynamic characteristics of coal gangue-filled reclaimed cropland and forest land under time series

作　　者：马腾辉 李蓉 王坤 渠俊峰[1,2,3,4] MA Tenghui;LI Rong;WANG Kun;QU Junfeng(Jiangsu Key Laboratory of Coal-Based Greenhouse Gas Control and Utilization,China University of Mining and Technology,Xuzhou 221008,China;School of Public Policy and Management,China University of Mining and Technology,Xuzhou 221116,China;Xuzhou Institute of Ecological Civilization Construction,Xuzhou 221008,China;Low Carbon Energy Institute,China University of Mining and Technology,Xuzhou 221008,China)

机构地区：[1]中国矿业大学,江苏省煤基温室气体减排与资源化利用重点实验室,江苏徐州221008 [2]中国矿业大学公共管理学院,江苏徐州221116 [3]徐州市生态文明建设研究研究,江苏徐州221116 [4]中国矿业大学低碳能源研究院,江苏徐州221008

出　　处：《煤炭科学技术》2023年第5期260-268,共9页Coal Science and Technology

基　　金：江苏省煤基温室气体减排与资源化利用重点实验室开放基金资助项目(2020KF01)。

摘　　要：为明确复垦后土壤质量与土壤碳循环之间的内在机理,揭示时间序列下复垦土壤的碳动态特征规律,研究选取了山东邹城东滩矿区复垦3、6、9、12 a的耕地土壤和复垦3、12 a的林地土壤为研究对象,并以矿区内部未受塌陷影响的正常耕地和林地作为对照。通过实地采样并检测土壤总碳(TC)、总氮(TN)、土壤有机碳(SOC)、土壤微生物量碳(MBC)以及土壤理化性质(pH、AN、AP),探究时间序列下复垦重构土壤在耕地和林地2种不同利用方式下的土壤碳动态特征,及其与土壤理化性质的相关性关系。研究结果表明:复垦后耕地和林地利用方式下土壤有机碳含量均随复垦时间的增加而逐渐增加,复垦3 a和12 a的耕地和林地相比,耕地各土层深度下土壤有机碳含量均高于相应深度林地土壤;复垦12 a的耕地土壤0~20 cm有机碳含量已与对照无显著差异,复垦12 a的林地土壤40~60 cm能达到对照水平。各复垦年限耕地和林地土壤中总碳含量均高于对照,这与复垦土壤中较高比例的土壤无机碳含量有关。复垦后土壤微生物量碳呈持续增长的趋势,相同复垦年限的耕地和林地土壤相比,耕地土壤微生物量碳含量均显著高于林地,且增速更快;复垦9 a的耕地土壤微生物量碳含量已与对照无显著差异,复垦12 a的耕地土壤微生物量碳含量达到362.59 mg/kg已显著高于对照,复垦12 a的林地土壤微生物量碳含量达到110.94 mg/kg仍显著低于对照。复垦后耕地土壤微生物熵与其土壤微生物量碳含量的变化趋势相似,均呈现逐渐增加的规律。复垦6、9和12 a的耕地土壤微生物熵均显著高于对照;复垦3 a和12 a的林地土壤微生物熵均显著低于对照。复垦土壤SOC与MBC、TN、AN呈极显著正相关(p<0.01),与微生物熵q(MBC)、AP呈显著正相关(p<0.05),与pH呈显著负相关(p<0.05);MBC与TN、AN呈极显著正相关(p<0.01),与q(MBC)、AP呈显著正相关(p<0.05),与TCIn order to clarify the intrinsic mechanism between soil quality and soil carbon cycling after reclamation and to reveal the characteristic patterns of carbon dynamics of reclaimed soils under time series,the cultivated soils of 3,6,9 and 12 a reclaimed Dongtan mine area in Zoucheng,Shandong Province and the forested soils of 3 a and 12 a reclaimed were selected for this study,and the normal cultivated and forested soils within the mine area that were not affected by the collapse were used as controls.Soil carbon dynamics characteristics of reclaimed reconstructed soils under two different utilization methods of cropland and forest land under time series and its correlation relationship with soil physicochemical properties were investigated by field sampling and testing soil total carbon(TC),total nitrogen(TN),soil organic carbon(SOC),soil microbial quantity carbon(MBC)and soil physicochemical properties(pH,AN,AP).The results of the study showed that the soil organic carbon content of both cultivated land and forest land after reclamation increased gradually with the increase of reclamation time,and compared with the cultivated land and forest land after reclamation for 3 a and 12 a,the soil organic carbon content of cultivated land at all soil depths was higher than that of forest land soil at the corresponding depths;the organic carbon content of cultivated land soil 0-20 cm after reclamation for 12 a was not significantly different from that of the control,and the forest land soil 40-60 cm after reclamation for 12 a could reach the control level.The organic carbon content of 40-60 cm of forest soils reclaimed for 12 a was not significantly different from that of the control.The total carbon content of both cropland and forest soils was higher than the control at all reclamation years,which was related to the higher proportion of soil inorganic carbon content in the reclaimed soils.The soil microbial carbon content of cultivated soils was significantly higher than that of forested soils in the same reclamation

关 键 词：时间序列 充填复垦 不同利用方式 土壤碳动态 

分 类 号：TD88[矿业工程—矿山开采] X171[环境科学与工程—环境科学]