土壤退化的总有机碳含量预警  

Total organic carbon content as an early warning indicator of soil degradation

作　　者：郭利成 熊尚发 陈雨露 崔静怡 杨石岭 王恒 王永达 丁仲礼 Licheng Guo;Shangfa Xiong;Yulu Chen;Jingyi Cui;Shiling Yang;Heng Wang;Yongda Wang;Zhongli Ding(Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China [2]College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Science Bulletin》2023年第2期150-153,M0003,共5页科学通报（英文版）

基　　金：supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDA19050104 and XDB26020401);the National Key Research and Development Program of China(2017YFA0603404);the National Natural Science Foundation of China(42007282 and 42077409);the Key Research Program of the Institute of Geology&Geophysics,Chinese Academy of Sciences(IGGCAS-201905)。

摘　　要：土壤退化是威胁全球粮食安全、影响土地生态服务功能的一个关键因素.如何在区域空间尺度对土壤退化状况进行预警,是保障国家粮食安全和有效维护土壤安全的重要前提.本研究以我国重要粮食主产区东北黑土区为研究对象,选取全新世(~11,700年以来)肥沃土壤(黑土、黑色砂质土壤)与贫瘠土壤(风成砂、灰黑色砂质土壤)作为材料,通过分析528个样品的总有机碳(TOC)含量和相关地球物理、地球化学和同位素指标,在研究区集成了一批与土壤性质有关的指标数据,同时在全国范围集成了一套与土壤肥力有关的谷物产量数据集,得到土壤TOC指示土壤退化进程的重要发现,即:土壤TOC含量大于0.5%时,土壤肥沃、健康,可以持续支撑粮食生产,土壤TOC含量小于0.5%时,土壤则已退化至贫瘠状态.由此我们认为,土壤TOC含量可作为预警指标有效示警土壤退化,土壤TOC含量0.5%是土壤退化的一个关键阈值,在全球范围内保持TOC含量高于0.5%对于维持农业生产、保障粮食安全具有重大战略意义.Soil degradation(e.g.,caused by soil erosion in this study)is defined by the shift from a stable soil ecosystem,in which arable soils remain in good condition and maintain a stable level of sustainable food production,to a relatively fragile and infertile state[1].Soil degradation poses major threats to the provision of edaphic ecosystem services,especially food production.

关 键 词：砂质土壤 土壤退化 贫瘠土壤 东北黑土区 全球粮食安全 谷物产量 总有机碳含量 预警指标 

分 类 号：S153.6[农业科学—土壤学]