西南喀斯特石漠化环境下土地利用变化对土壤有机碳及其组分的影响

doi:10.13287/j.1001-9332.202005.016

应用生态学报 ›› 2020, Vol. 31 ›› Issue (5): 1607-1616.doi: 10.13287/j.1001-9332.202005.016

西南喀斯特石漠化环境下土地利用变化对土壤有机碳及其组分的影响

白义鑫^1,2, 盛茂银^1,2*, 胡琪娟^1,3, 赵楚^1,3, 吴静^1,3, 张茂莎^1,3

¹贵州师范大学喀斯特研究院, 贵阳 550001;
²国家喀斯特石漠化治理工程技术研究中心, 贵阳 550001;
³贵州省喀斯特石漠化防治与衍生产业工程实验室, 贵阳 550001

收稿日期:2019-12-26 出版日期:2020-05-15 发布日期:2020-05-15
通讯作者: * E-mail: shmoy@163.com
作者简介:白义鑫, 男, 1993年生, 硕士研究生。主要从事喀斯特生态建设与区域经济研究。E-mail: baiyx1025@163.com
基金资助:
贵州省科学技术基金项目([2019]1224)、贵州省优秀青年科技人才支持计划项目([2017]5638)和贵州省科技计划项目([2017]5726)资助

Effects of land use change on soil organic carbon and its components in karst rocky desertification of southwest China

BAI Yi-xin^1,2, SHENG Mao-yin^1,2*, HU Qi-juan^1,3, ZHAO Chu^1,3, WU Jing^1,3, ZHANG Mao-sha^1,3

¹Institute of Karst Research, Guizhou Normal University, Guiyang 550001, China;
²National Engineering Research Center for Karst Rocky Desertification Control, Guiyang 550001, China;
³Guizhou Engineering Laboratory for Karst Rocky Desertification Control and Derivative Industry, Guiyang 550001, China

Received:2019-12-26 Online:2020-05-15 Published:2020-05-15
Contact: * E-mail: shmoy@163.com
Supported by:
This work was supported by the Science and Technology Foundation of Guizhou Province ([2019]1224), the Excellent Young Science and Technology Talents of Guizhou Province ([2017]5638), and the Science and Technology Foundation of Guizhou Province ([2017]5726).

摘要/Abstract

摘要： 土壤有机碳是喀斯特生态系统中碳转移的动力学媒介和碳流通的主要途径,土壤有机碳及其组分是土壤碳循环的重要组成部分,然而目前缺乏关于喀斯特地区土壤有机碳及其组分的研究。本研究以西南典型喀斯特石漠化区——贵州关岭花江6种典型土地利用方式下(花椒林、火龙果林、花椒火龙果混交林、圆柏林、圆柏女贞混交林和坡耕地)的土壤为研究对象,分析土地利用方式变化对土壤有机碳含量(SOC)和储量(SOCS)、土壤水溶性有机碳(WSOC)、易氧化有机碳(EOC)、颗粒有机碳(POC)、轻组有机碳(LFOC)及重组有机碳(HFOC)含量及其分配比例的影响。结果表明: 6种土地利用方式下SOC和SOCS均表现为圆柏林、圆柏女贞混交林和花椒林显著大于火龙果林、花椒火龙果混交林和坡耕地;在0～20 cm土层,土壤SOCS平均值为花椒林＞圆柏林＞圆柏女贞混交林＞坡耕地＞花椒火龙果混交林＞火龙果林。土壤WSOC、EOC、POC、LFOC和HFOC含量均表现为圆柏林、圆柏女贞混交林和花椒林大于其他3种土地类型。土壤SOC与其各组分(WSOC、EOC、POC、LFOC和HFOC)均呈显著正相关,且各组分两两之间也呈显著正相关。花椒林可作为中国西南喀斯特石漠化生态恢复和山地农业发展优先考虑的经济物种。土壤WSOC、EOC、POC、LFOC和HFOC可作为反映土壤有机碳库的有效指标。

关键词: 喀斯特, 石漠化治理, 土地利用方式, 土壤有机碳, 有机碳组分

Abstract: Soil organic carbon (SOC) is the dynamic medium of carbon transfer and the main pathway of carbon transfer in the karst ecosystem. SOC and its components are the important parts in soil carbon cycling of karst ecosystem. However, few studies have focused on SOC and its components in the karst ecosystem. We analyzed the effects of land use change on the SOC content, SOC reserve (SOCS), water-soluble organic carbon (WSOC), easily oxidizable organic carbon (EOC), particu-late organic carbon (POC), and light fraction organic carbon (LFOC), and heavy fraction organic carbon (HFOC) and their distribution ratio, with six different land-use patterns [Zanthoxylum bungeanum forest (HJ), Hylocereus undulates forest (HL), mixed forest of Z. bungeanum and H. undulates (HHL), Sabina chinensis forest (YB), mixed forest of S. chinensis and Ligustrum luci-dum (YBN), and slope cropland (PD)] in Huajiang Canyon of Guanling County, Guizhou Pro-vince. Results showed that SOC and SOCS in YB, YBN and HJ were significantly higher than those in HL, HHL and PD. In the 0-20 cm soil layer, the concentrations of SOCS followed the order of HJ＞YB＞YBN＞PD＞HHL＞HL. Contents of WSOC, EOC, POC, LFOC and HFOC in YB, YBN, and HJ were all higher than those in the other three patterns. Significant positive correlations existed between SOC and each of its components (WSOC, EOC, POC, LFOC and HFOC), also between any two of those components. Z. bungeanum could be used as a priority economic species for the ecological rehabilitation of karst rocky desertification and mountain agriculture development in Southwest China. WSOC, EOC, POC, LFOC and HFOC could be used as indicators of soil organic carbon pool.

Key words: karst, rocky desertification control, land use type, soil organic carbon, soil organic carbon component

白义鑫, 盛茂银, 胡琪娟, 赵楚, 吴静, 张茂莎. 西南喀斯特石漠化环境下土地利用变化对土壤有机碳及其组分的影响[J]. 应用生态学报, 2020, 31(5): 1607-1616.

BAI Yi-xin, SHENG Mao-yin, HU Qi-juan, ZHAO Chu, WU Jing, ZHANG Mao-sha. Effects of land use change on soil organic carbon and its components in karst rocky desertification of southwest China[J]. Chinese Journal of Applied Ecology, 2020, 31(5): 1607-1616.

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西南喀斯特石漠化环境下土地利用变化对土壤有机碳及其组分的影响

Effects of land use change on soil organic carbon and its components in karst rocky desertification of southwest China

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