近30年黔西喀斯特区典型县域农田土壤有机碳动态研究——以贵州普定县为例

丁长欢; 慈恩; 邵景安; 高岩红; 王莲阁; 谢德体

doi:10.11932/karst201504Y01

近30年黔西喀斯特区典型县域农田土壤有机碳动态研究——以贵州普定县为例

doi: 10.11932/karst201504Y01

1.
西南大学资源环境学院
2.
重庆师范大学地理与旅游学院

基金项目: 中国科学院战略性先导科技专项（XDA05050506）；国家水体污染控制与治理科技重大专项(2012ZX07104-003)；中央高校基本科研业务费专项（XDJK2013B043）；重庆市环境保护局环保科技项目（环科字2010第26号）

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出版历程
- 发布日期: 2015-06-25

Dynamics of soil organic carbon in cropland of karst regions in western Guizhou Province during last 30 years: A case study of Puding county, Guizhou Province

1.
College of Resources and Environment, Southwest University
2.
College of Geography and Tourism, Chongqing Normal University

摘要

摘要: 文章选取贵州省普定县作为黔西喀斯特区的典型县域，依据1980年第二次土壤普查数据和2011年实测土壤数据，运用土壤类型法，计算该县域近30年（1980-2011年）农田表层（0～20 cm）土壤有机碳（SOC）储量和密度的变化，并借助逐步回归分析，对该县域近30年农田表层SOC动因进行分析，结果表明：（1）普定县近30年来农田0～20 cm表土有机碳库总体表现为基本持平且略有上升的趋势，增幅为0.95%，年均变化量15.31 kg C·hm-2·a-1；（2）不同类型农田土壤的表层有机碳储量和密度变化较大，其中水稻土固碳幅度最大，为28.95%，而山地灌丛草甸土的丢碳最为严重，降幅达70.22%；（3）农田表层SOC密度年均变化量在空间分布上总体表现为县城中部、南部和三岔河及夜郎湖地区呈增加趋势，而在县城以西、以东及斗篷山大部分区域则为下降态势，这主要受土壤类型空间分布差异所致；（4）影响普定县农田表层SOC变化的主要因素有SOC密度初始值（1980年）、C/N、砾石体积比和速效K密度等，其中SOC密度年均变化量与SOC密度初始值和砾石体积比呈负相关，与C/N和速效K密度呈正相关。总的来看，近30年的人为活动对普定县农田表土有机碳总库存未产生负面影响。
- 农田 /
- 土壤有机碳 /
- 普定 /
- 喀斯特 /
- 储量
Abstract: Puding, a typical county in the karst region of western Guizhou Province, was selected as the study area. According to the data collected from the second soil survey of Puding county in 1980 and the cropland soil survey of Puding county in 2011, this work calculated the variation in soil organic carbon (SOC) storage and density of cropland topsoil (0 to 20 cm) in Puding county in the past 30 years (from 1980 to 2011). The soil-type classification method and the stepwise regression analysis method were used to analyze the factors affecting the SOC stock change in cropland topsoil of Puding county. The results show that，(1)The SOC stock of cropland topsoil in Puding county increased slightly from 1980 to 2011. Average SOC density for all the cropland topsoil in this area increased by 0.95%, and its average annual variation was 15.31 kg C·hm-2·a-1 from 1981 to 2011. (2)The changes of SOC density and storage in cropland topsoil were larger in soil of different types, where the biggest carbon sequestration was paddy soil, accounting for 28.95%, while the carbon lost was mostly mountain shrub meadow soil, accounting for 70.22%.(3)In general, the spatial distribution of SOC density average annual variation shows an increasing trend in central and southern Puding county and the Sancha river and Yelang lake area, while a decreasing trend in the east and west of the county and most regions of Cape mountain, which was mainly affected by the differences of soil types. (4)The major factors affecting the SOC change in cropland topsoil of Puding county include the initial value of SOC density (1980a), C/N, gravel volume ratio, and available K density. Moreover, C/N and available K density have a positive effect, while the effects of the initial value of SOC density and gravel volume ratio are negative function. In conclusion, the effect of human activities on the SOC stock in cropland topsoil of Puding county is positive in the recent 30 years. Results of this paper identify the dynamic changes and impact factors of cropland topsoil organic carbon pool in Puding county, and the available data would provide a basis for the effective management of cropland topsoil SOC carbon pool in the karst regions of western Guizhou Province.
- cropland /
- soil organic carbon /
- Puding /
- karst /
- storage

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