中亚热带土地利用方式对土壤易氧化有机碳及碳库管理指数的影响  

Effects of Land Use on Soil Readily Oxidized Carbon and Carbon Management Index in Hilly Region of Central Hunan Province

作　　者：张仕吉[1] 项文化[2,3] 孙伟军[2] 方晰[2,3] 

机构地区：[1]中南林业科技大学材料科学与工程学院,湖南长沙410004 [2]中南林业科技大学生命科学与技术学院,湖南长沙410004 [3]南方林业生态应用技术国家工程实验室,湖南长沙410004

出　　处：《生态环境学报》2016年第6期911-919,共9页Ecology and Environmental Sciences

基　　金：国家林业公益性行业科研专项(201504411);中南林业科技大学引进高层次人才科研启动基金项目(2014YJ019)

摘　　要：为了解土地利用方式对中亚热带土壤易氧化有机碳（ROC）及碳库管理指数（CMI）的影响,采用KMn O4氧化法,对湘中丘陵区6种土地利用类型：石栎（Lithocarpus glaber）-青冈（Cyclobalanopsis glauca）次生林、杉木（Cunninghamia lanceolata）人工林、毛竹（Phyllostachys edulis）林、苗圃、农用旱地、水田土壤ROC含量及其季节动态变化进行测定,以石栎-青冈次生林土壤为参照,计算土壤CMI,分析土壤ROC含量、CMI与土壤理化性状的关系。结果表明,同一土层ROC含量、ROC分配比例在不同土地利用类型之间差异显著,ROC含量表现为石栎-青冈次生林〉毛竹林〉水田〉杉木人工林〉农用旱地〉苗圃,ROC分配比例为水田〉石栎-青冈次生林〉毛竹林〉农用旱地〉苗圃〉杉木人工林;与石栎-青冈次生林相比,毛竹林、水田、杉木人工林、农用旱地、苗圃土壤ROC含量依次下降了9.8%-15.6%、22.0%-36.3%、27.6%-40.1%、47.4%-51.2%、58.0%-65.5%,水田、毛竹林、杉木人工林、农用旱地、苗圃土壤CMI依次下降了11.6%-18.4%、9.1%-20.9%、40.0%-44.1%、48.6%-51.5%和59.3%-66.6%;6种土地利用类型土壤ROC含量的季节变化节律基本一致,表现为春夏季较秋冬季高,夏季最高,冬季或秋季最低;土壤ROC含量、CMI与土壤SOC、全N、全P、水解N、有效P含量之间呈显著或极显著正相关,与土壤p H呈极显著负相关,与土壤含水率、全K、速效K不相关。土地利用方式对土壤ROC含量、CMI影响显著,次生林转变为人工林或农用地后,土壤碳库稳定性和生物可利用性下降。In order to understand the effects of land use types on soil readily oxidized carbon （ROC） and carbon management index （CMI） in the mid-subtropical zone, KMnO4 chemical oxidation method was used to study the seasonal variations of soil ROC concentration, calculate soil CMI by using Lithocarpus glaber-Cyclobalanopsis glauca secondary forest as contrast, and investigate correlation of soil ROC concentration and soil CMI with soil physicochemical properties in six adjacent land use types： （1） L. glaber-C. glauca secondary forest. （2） Cunninghamia lanceolata plantation. （3） Phyllostachys edulis stands. （4） Seedling nursery lands. （5） Slope farmland. And （6） paddy field in hilly areas of central Hunan, China. The results showed that soil ROC concentrations and the proportion of ROC to total SOC in the 0-15, 15-30 cm soil depth were significantly different with the land use types, soil ROC concentration ranked in an order L. glaber-C. glauca secondary forest 〉 C. lanceolata plantation 〉P. edulis stands 〉 paddy field 〉 slope farmland 〉 seedling nursery lands, the proportions of ROC to total SOC were in the order as follow： paddy field 〉 L. glaber-C. glauca secondary forest 〉P. edulis stands 〉 slope farmland 〉 seedling nursery lands 〉 C. lanceolata plantation. Compared with L. glaber-C. glauca secondary forest, soil ROC concentrations decreased by 9.8%-15.6%, 22.0%-36.3%, 27.6%-40.1%, 47.4%-51.2%, 58.0%-65.5% in P. edulis stands, paddy field, C. lanceolata plantation, slope farmland and nursery, respectively, soil CMI decreased by 11.6%-18.4%, 9.1%-20.9%, 40.0%-44.1%, 48.6%-51.5% and 59.3%-66.6% in paddy field, P. edulis stands, C. lanceolata plantation, slope farmland and seedling nursery lands, respectively. Seasonal variations of ROC concentrations were considerable but a similar change patterns were found in different land use types. Soil ROC concentrations were significantly higher in spring, summer than in autumn and winter, the highest was in summer, t

关 键 词：湘中丘陵区 土地利用方式 易氧化有机碳 次生林 碳库管理指数 

分 类 号：S154.1[农业科学—土壤学] X144[农业科学—农业基础科学]