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缙云山5种植被下土壤活性有机碳及碳库变化特征
朱浩宇, 王子芳, 陆畅, 陈仕奇, 王富华, 吕盛, 高明
西南大学资源环境学院, 重庆 400715
摘要:
为揭示重庆市缙云山不同植被下土壤活性有机碳及碳库分配特征,以该地区5种植被类型:阔叶林、针叶林、混交林、竹林和荒草地为研究对象,分析不同植被类型下各土层土壤有机碳(SOC)、微生物生物量碳(MBC)、可溶性有机碳(DOC)、易氧化有机碳(ROC)含量及其土壤碳库的变化特征。结果表明:SOC和各活性有机碳组分含量及分配比例受植被类型和土层深度的明显影响。SOC的平均含量在0~100 cm土层表现为竹林(16.74 g/kg) > 阔叶林(12.62 g/kg) > 草地(11.14 g/kg) > 混交林(8.16 g/kg) > 针叶林(5.98 g/kg),并随土层深度的增加而减小。竹林和阔叶林的土壤MBC和ROC含量均明显高于混交林和针叶林,且在各植被剖面上均表现出垂直递减的规律,表聚效应明显。除草地外,4种植被的土壤碳库管理指数随土层深度的增加而减小,均表现为表层(0~20 cm)最高。不同植被类型间,竹林的DOC分配比例在各土壤层次均最小,整个土壤剖面均值仅为0.1%。由相关性分析可知,MBC、ROC、SOC含量和土壤SOC储量有着极其显著的相关性。因此,土壤MBC和ROC可以作为衡量缙云山森林不同植被类型下土壤有机碳库变化的敏感性指标。
关键词:  缙云山  植被类型  活性有机碳  土壤碳库
DOI:10.13758/j.cnki.tr.2021.02.019
分类号:S151.9
基金项目:国家重点研发计划项目(2017YFD0800101)资助。
Variation Characteristics of Soil Active Organic Carbon and Carbon Pools Under Five Vegetation Types in Jinyun Mountain
ZHU Haoyu, WANG Zifang, LU Chang, CHEN Shiqi, WANG Fuhua, Lü Sheng, GAO Ming
College of Resource and Environment, Southwest University, Chongqing 400715, China
Abstract:
In order to reveal the characteristics of soil active organic carbon and carbon pool allocation under different vegetations in Jinyun Mountain in Chongqing, broad-leaved forest, coniferous forest, mixed forest, bamboo forest and wild grassland were taken as research objects. The contents of soil organic carbon (SOC), microbial biomass carbon (MBC), dissolved organic carbon (DOC) and easily oxidized organic carbon (ROC) in each soil layer within 0-100 cm were measured, and the changing characteristics of soil organic carbon storages (SOCS) were also studied and compared. The results showed that the content and distribution ratio of SOC and active organic carbon components were significantly affected by vegetation type and soil depth. The average content of SOC in 0-100 cm soil layer was in order of bamboo forest (16.74 g/kg) > broad leaved forest (12.62 g/kg) > grassland (11.14 g/kg) > mixed forest (8.16 g/kg) > coniferous forest (5.98 g/kg), and decreased with increasing soil depth under all vegetation types. The contents of MBC and ROC in bamboo and broad-leaved forests were significantly higher than those in mixed and coniferous forests, and both declined with the increasing soil depth under all vegetation types, showing the significant surface aggregation effect. Except for grassland, soil carbon pool management indexes under other 4 vegetation types decreased with increasing soil depth, and were the highest in the surface layers (0-20 cm soil layer). Among different vegetation types, the proportion of DOC in bamboo forest was the smallest in each soil layer, with an average value of 0.1% for the whole soil profile. The correlation analysis showed there were extremely significant correlation between MBC, ROC, SOC and SOCS. Therefore, MBC and ROC can be used as an important indicator to evaluate the dynamic changes of soil carbon pool in the study area.
Key words:  Jinyun Mountain  Vegetation types  Active organic carbon  Soil carbon pool

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