乌兰布和沙漠东北部不同耕作年限农田土壤有机碳密度及其影响因素

doi:10.13287/j.1001-9332.202210.017

应用生态学报 ›› 2022, Vol. 33 ›› Issue (10): 2628-2634.doi: 10.13287/j.1001-9332.202210.017

• 陆地生态系统固碳与增汇专栏 • 上一篇下一篇

乌兰布和沙漠东北部不同耕作年限农田土壤有机碳密度及其影响因素

曹琪琪¹, 肖辉杰^2*, 刘涛³, 孙景宽¹, 夏江宝¹, 王栋⁴, 辛智鸣⁵, 贺文君¹, 赵丹丹¹, 黄文文⁶

¹滨州学院山东省黄河三角洲生态环境重点实验室, 山东滨州 256603;
²北京林业大学水土保持学院, 北京 100083;
³中国科学院地理科学与资源研究所, 北京 100101;
⁴深圳市水务规划设计院股份有限公司, 广东深圳 518022;
⁵中国林业科学研究院沙漠林业实验中心/内蒙古磴口荒漠生态系统国家定位观测研究站, 内蒙古磴口 015200;
⁶滨州学院生物与环境工程学院, 山东滨州 256603

收稿日期:2022-06-15 修回日期:2022-08-10 出版日期:2022-10-15 发布日期:2023-04-15
通讯作者: * E-mail: soilandwater2006@hotmail.com
作者简介:曹琪琪, 女, 1992年生, 博士, 讲师。主要从事土壤生态学和植物生态学研究。E-mail: qiqicao163@163.com
基金资助:
中美政府间国际科技创新合作项目(2019YFE0116500)和滨州学院博士科研启动经费(2021Y27)

Soil organic carbon density and its influencing factors in croplands with different cultivation years in the Northeastern Ulan Buh Desert, China

CAO Qi-qi¹, XIAO Hui-jie^2*, LIU Tao³, SUN Jing-kuan¹, XIA Jiang-bao¹, WANG Dong⁴, XIN Zhi-ming⁵, HE Wen-jun¹, ZHAO Dan-dan¹, HUANG Wen-wen⁶

¹Shandong Key Laboratory of Eco-Environmental Science for the Yellow River Delta, Binzhou University, Binzhou 256603, Shandong, China;
²College of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China;
³Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;
⁴Shen-zhen Water Planning and Design Institute Co., Ltd., Shenzhen 518022, Guangdong, China;
⁵Inner Mongolia Dengkou Desert Ecosystem National Observation Research Station/Experimental Center of Desert Forestry, Chinese Academy of Forestry, Dengkou 015200, Inner Mongolia, China;
⁶College of Biological and Environmental Engineering, Binzhou University, Binzhou 256603, Shandong, China

Received:2022-06-15 Revised:2022-08-10 Online:2022-10-15 Published:2023-04-15

摘要/Abstract

摘要： 明确干旱区农田开垦过程中土壤有机碳变化及其影响因素对评估其固存特征具有重要意义。本研究以乌兰布和沙漠东北部不同开垦年限(2～5、12～15、25～30、40～50年)农田为对象,以未开垦的自然土壤为对照,采用空间代替时间的研究方法,探究农田开垦过程中0～2 m土层内土壤有机碳密度变化特征及其影响因素。结果表明: 随开垦年限的增加,浅层(0～0.4 m)土壤有机碳密度呈持续增加趋势,但农田土壤有机碳密度均处于较低水平(0.990～1.983 kg·m^-2)。深层(1.2～2 m)土壤有机碳密度在开垦年限较长(25～30和40～50年)的农田中有所增加,而在开垦年限较短(2～5和12～15年)的农田中无增加趋势。未开垦土壤和各耕作年限农田深层土壤有机碳密度在0～2 m土层中占比较大(28.9%～38.6%)。不同耕作年限农田中土壤有机碳密度随土层深度的增加均呈先减小后增大的二次函数关系,且拟合度较高(R²为0.757～0.972)。土壤黏粒和粉粒含量是影响0～2 m土层有机碳密度的关键因素,且耕作年限对浅层(0～0.4 m)土壤有机碳的积累具有重要促进作用。

关键词: 乌兰布和沙漠, 农田, 开垦年限, 影响因素

Abstract: Understanding the changes and influencing factors of soil organic carbon density (SOCD) during the conversion of uncultivated natural soil to croplands is of great significance for the assessment of carbon sequestration in arid areas. In this study, we compared SOCD in the uncultivated soil and that in croplands with different cultivation years (2-5, 12-15, 25-30, 40-50 years) in the Northeastern Ulan Buh Desert. The change of SOCD and its influencing factors at 0-2 m soil depth during the conversion of uncultivated natural soil to croplands were explored by the method of replacing time with space. The results showed that SOCD at the shallow soil depth (0-0.4 m) in croplands increased continuously with cultivation years, but basically at low levels (0.990-1.983 kg·m^-2). The SOCD at deep soil (1.2-2 m) increased in the croplands with longer cultivation years (25-30 and 40-50 years), whereas no obvious change trends in both the croplands with shorter cultivation years (2-5 and 12-15 years) and the uncultivated natural soil. The SOCD at deep soil (1.2-2 m) were relatively large (28.9%-38.6%) of the 0-2 m soil depth of uncultivated natural soil and croplands with different cultivation years. The vertical distribution of SOCD in croplands with different cultivation years were well fitted by quadratic functions (with R² ranging from 0.757 to 0.972). It was noteworthy that soil clay and silt contents had dominant influences on SOCD at all the soil profile (0-2 m), and that cultivation years mainly contributed to the accumulation of SOC at the shallow soil (0-0.4 m).

Key words: Ulan Buh Desert, cropland, cultivation year, influencing factor

曹琪琪, 肖辉杰, 刘涛, 孙景宽, 夏江宝, 王栋, 辛智鸣, 贺文君, 赵丹丹, 黄文文. 乌兰布和沙漠东北部不同耕作年限农田土壤有机碳密度及其影响因素[J]. 应用生态学报, 2022, 33(10): 2628-2634.

CAO Qi-qi, XIAO Hui-jie, LIU Tao, SUN Jing-kuan, XIA Jiang-bao, WANG Dong, XIN Zhi-ming, HE Wen-jun, ZHAO Dan-dan, HUANG Wen-wen. Soil organic carbon density and its influencing factors in croplands with different cultivation years in the Northeastern Ulan Buh Desert, China[J]. Chinese Journal of Applied Ecology, 2022, 33(10): 2628-2634.

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乌兰布和沙漠东北部不同耕作年限农田土壤有机碳密度及其影响因素

Soil organic carbon density and its influencing factors in croplands with different cultivation years in the Northeastern Ulan Buh Desert, China

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