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不同植被恢复模式对土壤有机碳分子结构及其稳定性的影响
引用本文:张勇,胡海波,黄玉洁,李土生,周子贵,郭晓平,高海力.不同植被恢复模式对土壤有机碳分子结构及其稳定性的影响[J].环境科学研究,2015,28(12):1870-1878.
作者姓名:张勇  胡海波  黄玉洁  李土生  周子贵  郭晓平  高海力
作者单位:南京林业大学南方现代林业协同创新中心, 江苏 南京 210037 ;浙江省林业生态工程管理中心, 浙江 杭州 310020,南京林业大学南方现代林业协同创新中心, 江苏 南京 210037,浙江省林业科学研究院, 浙江 杭州 310023,浙江省林业生态工程管理中心, 浙江 杭州 310020,浙江省林业生态工程管理中心, 浙江 杭州 310020,南京林业大学南方现代林业协同创新中心, 江苏 南京 210037,浙江省林业生态工程管理中心, 浙江 杭州 310020
基金项目:浙江省森林生态效益补偿基金公共管护支出项目;江苏省水土保持与生态修复重点实验室与南京林业大学林学优势学科项目;浙江省林业科技项目(2012B17)
摘    要:为揭示不同植被恢复模式对土壤有机碳分子结构及其稳定性的影响机理,分别在浙江凤阳山国家级自然保护区的石梁岙和凤阳湖设置样地,采用13C核磁共振技术分析常绿阔叶林与杉木林、柳杉林与针阔混交林全土和不同粒级(0~0.5、0.5~2.0、2.0~5.0、5.0 mm)土壤团聚体中有机碳的质量分数及其分子结构特征.结果表明:1常绿阔叶林0~20 cm层全土w(有机碳)(12.84 g/kg)显著高于杉木林(9.98 g/kg),柳杉林(13.93 g/kg)显著高于针阔混交林(11.54 g/kg)(P0.05).不同植被恢复模式下,土壤团聚体w(有机碳)总体上均随着粒径的增大呈降低趋势.2与杉木林相比,常绿阔叶林全土有机碳中w(烷氧碳)较高,w(烷基碳)、w(芳香碳)、w(烷基碳)/w(烷氧碳)、w(疏水碳)/w(亲水碳)则较低,显示常绿阔叶林全土有机碳稳定性较差;与针阔混交林相比,柳杉林全土有机碳中w(烷基碳)、w(烷基碳)/w(烷氧碳)、w(疏水碳)/w(亲水碳)较高,w(烷氧碳)则较低,显示柳杉林全土有机碳稳定性较好.与0~20 cm层相比,不同植被恢复模式下20~40 cm层全土w(烷氧碳)均明显降低,w(烷基碳)、w(烷基碳)/w(烷氧碳)、w(疏水碳)/w(亲水碳)均明显升高,有机碳稳定性变好.3随着粒径的增大,不同植被恢复模式下土壤团聚体的w(烷基碳)、w(烷基碳)/w(烷氧碳)、w(疏水碳)/w(亲水碳)均呈降低趋势,w(烷氧碳)均呈升高趋势,说明团聚体结合的有机碳稳定性逐渐变差.研究显示,不同植被恢复模式下的不同树种组成是影响土壤有机碳质量分数及其分子结构、稳定性差异的主要因素.

关 键 词:土壤有机碳    团聚体    核磁共振    植被恢复模式    分子结构    稳定性
收稿时间:2015/6/4 0:00:00
修稿时间:2015/8/30 0:00:00

Effects of Different Vegetation Restoration Models on Molecular Structure and Stability of Soil Organic Carbon
ZHANG Yong,HU Haibo,HUANG Yujie,LI Tusheng,ZHOU Zigui,GUO Xiaoping and GAO Haili.Effects of Different Vegetation Restoration Models on Molecular Structure and Stability of Soil Organic Carbon[J].Research of Environmental Sciences,2015,28(12):1870-1878.
Authors:ZHANG Yong  HU Haibo  HUANG Yujie  LI Tusheng  ZHOU Zigui  GUO Xiaoping and GAO Haili
Institution:Collaborative Innovation Center of Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China ;Zhejiang Forestry Ecological Engineering Management Center, Hangzhou 310020, China,Collaborative Innovation Center of Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China,Zhejiang Forestry Academy, Hangzhou 310023, China,Zhejiang Forestry Ecological Engineering Management Center, Hangzhou 310020, China,Zhejiang Forestry Ecological Engineering Management Center, Hangzhou 310020, China,Collaborative Innovation Center of Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China and Zhejiang Forestry Ecological Engineering Management Center, Hangzhou 310020, China
Abstract:Abstract: The organic carbon contents and molecular structures of the total soil profiles and soil aggregates with different diameters (e.g., 0-0.5, >0.5-2.0, >2.0-5.0 and >5.0 mm) were compared between different forests in the national nature reservation of Fengyang Mountain, Zhejiang province, China. The forests compared were the evergreen broad-leaved forest and Cunninghamia lanceolata forest at Shiliangao, and the Cryptomeria fortunei forest and coniferous and broad-leaved mixed forest at Fengyanghu Lake. The technique used was the 13C nuclear magnetic resonance technique. This goal of the study was to assess the impact mechanisms of different vegetation restoration models on the molecular structure and stability of soil organic carbon. The results showed:1) w(organic carbon) (12.84 g/kg) of the total soil profile in the 0-20 cm soil layer under the evergreen broad-leaved forest was significantly higher than that of the Cunninghamia lanceolata forest (9.98 g/kg). That of the Cryptomeria fortunei forest (13.93 g/kg) was significantly higher than that of the coniferous and broad-leaved mixed forest (11.54 g/kg) (P<0.05). w(organic carbon) of soil aggregates under different vegetation restoration models showed decreasing trends along with increased aggregate size. 2) Compared with the Cunninghamia lanceolata forest, w(alcoxyl carbon) in the total soil organic carbon under the evergreen broad-leaved forest was higher, while w(alkyl carbon), w(aromatic carbon), w(alkyl carbon)/w(alcoxyl carbon) and w(hydrophobic carbon)/w(hydrophilic carbon) were lower, implying that the stability of the total soil organic carbon under the evergreen broad-leaved forest was poorer. Compared with the coniferous and broad-leaved mixed forest, the w(alkyl carbon), w(alkyl carbon)/w(alcoxyl carbon) and w(hydrophobic carbon)/w(hydrophilic carbon) in the total soil organic carbon under the Cryptomeria fortunei forest were higher, while w(alcoxyl carbon) was lower, implying that the stability of the total soil organic carbon under the Cryptomeria fortunei forest was better. Compared with the 0-20 cm soil layers, the w(alcoxyl carbon) in the total soil organic carbon of >20-40 cm soil layers under different vegetation restoration models decreased significantly, while the w(alkyl carbon), w(alkyl carbon)/w(alcoxyl carbon) and w(hydrophobic carbon)/w(hydrophilic carbon) increased significantly, implying that the stability of organic carbon in >20-40 cm soil layers was better. 3) With the increase of aggregate size, the w(alkyl carbon), w(alkyl carbon)/w(alcoxyl carbon) and w(hydrophobic carbon)/w(hydrophilic carbon) in organic carbon of soil aggregates under different vegetation restoration models showed decreasing trends, while the w(alcoxyl carbon) showed increasing trends, implying that the stability of organic carbon combined in aggregates gradually turned to be poor. The comprehensive result indicated that the contents, molecular structures and stability of soil organic carbon in the study area were decided mainly by tree species under the different vegetation restoration models.
Keywords:soil organic carbon  aggregate  nuclear magnetic resonance  vegetation restoration model  molecular structure  stability
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