Bai Yi-Xin, Sheng Mao-Yin, Hu Qi-Juan, Zhao Chu, Wu Jing, Zhang Mao-Sha
Institute of Karst Research, Guizhou Normal University, Guiyang 550001, China.
National Engineering Research Center for Karst Rocky Desertification Control, Guiyang 550001, China.
Ying Yong Sheng Tai Xue Bao. 2020 May;31(5):1607-1616. doi: 10.13287/j.1001-9332.202005.016.
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.
土壤有机碳（SOC）是岩溶生态系统中碳转移的动态介质和主要途径。SOC及其组分是岩溶生态系统土壤碳循环的重要组成部分。然而，针对岩溶生态系统中SOC及其组分的研究较少。我们分析了六种不同土地利用模式[花椒林（HJ）、火龙果林（HL）、花椒与火龙果混交林（HHL）、圆柏林（YB）、圆柏与女贞混交林（YBN）、坡耕地（PD）]对贵州省关岭县花江峡谷土壤有机碳含量、土壤有机碳储量（SOCS）、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）、重组有机碳（HFOC）及其分配比例的影响。结果表明，YB、YBN和HJ的SOC和SOCS显著高于HL、HHL和PD。在0-20cm土层中，SOCS浓度顺序为HJ＞YB＞YBN＞PD＞HHL＞HL。YB、YBN和HJ中WSOC、EOC、POC、LFOC和HFOC的含量均高于其他三种模式。SOC与其各组分（WSOC、EOC、POC、LFOC和HFOC）之间以及这些组分中的任意两者之间均存在显著正相关。花椒可作为中国西南岩溶石漠化生态修复和山地农业发展的优先经济物种。WSOC、EOC、POC、LFOC和HFOC可作为土壤有机碳库的指标。
