三江平原不同土地利用方式下土壤可溶性有机碳的分布特征  

Soil Dissolved Organic Carbon Contents and Distribution in Sanjiang Plain under Different Land Use Conditions

作　　者：郭岳 张仲胜[2] 宋晓林[2] 

机构地区：[1]吉林省湿地保护管理办公室,吉林长春130022 [2]中国科学院湿地生态与环境重点实验室,东北地理与农业生态研究所,吉林长春130012

出　　处：《湿地科学与管理》2017年第4期43-47,共5页Wetland Science & Management

基　　金：国家自然科学基金项目“东北沼泽湿地土壤碳库分子结构特征及其稳定性对气候变化响应机制”资助

摘　　要：通过测定三江平原不同土地利用方式下典型样带土壤可溶性有机碳(DOC)含量,研究了土壤DOC分布特征及影响因素,以揭示垦殖过程对土壤DOC的影响。结果表明:在不同的土地利用方式下,小叶章湿地土壤中DOC含量最高(768.54 mg/kg),林地次之(岛状林为676.65 mg/kg;人工杨树林为575.91 mg/kg),农田土壤最低(玉米地为318.7 mg/kg;水稻田为523.94 mg/kg)。除水稻田外,其余4种土地利用方式下土壤DOC由表层至底层均呈现出先增加而后急剧减少的趋势,在水稻田中,DOC含量随着剖面深度增加而明显升高;土壤DOC含量与土壤有机质(SOM)含量呈极显著正相关(r=0.588,p<0.001),与p H值呈显著负相关(r=-0.228,p=0.038)。湿地垦殖后,土壤中DOC占SOM的比例下降,表明湿地垦殖减缓了土壤碳周转速率。Soil dissolved organic carbon（DOC） contents in Sanjiang Plain under different land use were investigated to study its distribution characteristics and the potential affecting factors.Results indicated that the highest DOC contents were found in Deyeuxia angustifolia marsh（768.54 mg/kg）,and followed by the Island forest（676.65 mg/kg）,the poplar forest（575.91 mg/kg）,the paddy field（523.94 mg/kg）,and the corn field（318.7 mg/kg）.DOC contents were initially increasing and then rapidly decreasing with depths in all but sites the paddy field,where the DOC was continuously increasing.Correlation analysis showed that DOC contents were significantly positive related to soil organic matter contents（SOM）（r=0.588,p0.001）,and negatively related to p H（r=-0.228,p=0.038）.After reclamation,ratios of DOC to SOM in the paddy or corn filed were much lower than that in the Deyeuxia angustifolia marsh,and it meant that wetland reclamation slow down the carbon cycle rate in soils.

关 键 词：三江平原 土地利用方式 DOC 小叶章湿地 分布特征 

分 类 号：S153.6[农业科学—土壤学]