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桂林会仙喀斯特湿地水位梯度下不同植物群落土壤有机碳及其组分特征
引用本文:徐广平,李艳琼,沈育伊,张德楠,孙英杰,张中峰,周龙武,段春燕.桂林会仙喀斯特湿地水位梯度下不同植物群落土壤有机碳及其组分特征[J].环境科学,2019,40(3):1491-1503.
作者姓名:徐广平  李艳琼  沈育伊  张德楠  孙英杰  张中峰  周龙武  段春燕
作者单位:广西壮族自治区中国科学院广西植物研究所,广西喀斯特植物保育与恢复生态学重点实验室,桂林541006;广西壮族自治区中国科学院广西植物研究所,广西植物功能物质研究与利用重点实验室,桂林541006;广西师范大学生命科学学院,桂林,541004
基金项目:国家自然科学基金项目(31760162,41361057,41603079);广西喀斯特植物保育与恢复生态学重点实验室基金项目(17-259-23);广西科技攻关计划项目(桂科攻14124004-3-5);国家科技支撑计划项目(2012BAC16B01);广西自然科学基金项目(2018GXNSFJA130264,2017GXNSFBA198037);广西植物研究所基本业务费项目(桂植业17012)
摘    要:选择桂林会仙喀斯特湿地不同水位梯度下9种植物群落的土壤为研究对象,通过研究0~30 cm不同深度的土壤理化性质、土壤有机碳(SOC)、轻组有机碳(LFOC)、重组有机碳(HFOC)、易氧化有机碳(EOC)、可溶性有机碳(DOC)、颗粒有机碳(POC)、微生物生物量碳(MBC)含量等变化趋势,以揭示水位梯度下不同植物群落土壤有机碳组分的分布特征及其影响因子.结果表明:①会仙湿地土壤0~30cm LFOC、HFOC占SOC的质量分数分别为11. 10%,88. 90%,土壤轻组分分配比相对较低,重组分分配比较高;②各群落土壤DOC,EOC; POC和MBC(除铺地黍群落外)含量均随土层深度的增加而减少;与SOC含量变化趋势基本一致,各群落DOC、EOC、POC占SOC的比例随土层变化均呈减小趋势;③华克拉莎群落的SOC、LFOC、HFOC、MBC、DOC、EOC、POC含量在各土层中均为最高,且显著高于其它植物群落;④SOC、全氮(TN)与土壤有机碳各组分含量显著正相关(P 0. 01),土壤pH与LFOC、HFOC、DOC和POC显著正相关,土壤容重与LFOC、HFOC、DOC、EOC和POC显著负相关(P 0. 01),黏粒含量与LFOC、HFOC、DOC、POC和MBC显著负相关;⑤土壤全氮、砂粒含量、pH和土壤含水量对HFOC含量的主要贡献均表现为通过影响其它因子而产生的间接作用效应;土壤TN对EOC、DOC和POC含量具有较强的直接正作用效应;土壤含水量对MBC含量的直接负作用最大.土壤理化特征因子之间的相互作用共同影响着LFOC、HFOC及有机碳各组分含量的变化.

关 键 词:喀斯特湿地  植物群落类型  土壤有机碳  活性有机碳  水位梯度
收稿时间:2018/6/25 0:00:00
修稿时间:2018/9/2 0:00:00

Soil Organic Carbon Distribution and Components in Different Plant Communities Along a Water Table Gradient in the Huixian Karst Wetland in Guilin
XU Guang-ping,LI Yan-qiong,SHEN Yu-yi,ZHANG De-nan,SUN Ying-jie,ZHANG Zhong-feng,ZHOU Long-wu and DUAN Chun-yan.Soil Organic Carbon Distribution and Components in Different Plant Communities Along a Water Table Gradient in the Huixian Karst Wetland in Guilin[J].Chinese Journal of Environmental Science,2019,40(3):1491-1503.
Authors:XU Guang-ping  LI Yan-qiong  SHEN Yu-yi  ZHANG De-nan  SUN Ying-jie  ZHANG Zhong-feng  ZHOU Long-wu and DUAN Chun-yan
Institution:Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China,Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China,Guangxi Key Laboratory of Functional Phytochemicals Research and Utilization, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China,Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China,Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China,Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China,Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, China and College of Life Sciences, Guangxi Normal University, Guilin 541004, China
Abstract:
Keywords:Karst wetland  vegetation community types  soil organic carbon  labile organic carbon  water table gradient
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