植物营养与肥料学报2010,16(6)：1418-1425 Plant Nutrition and Fertilizer Science
黄土台塬不同土地利用方式下土壤碳组分的差异
刘梦云，常庆瑞*，杨香云
（西北农林科技大学资源环境学院，农业部黄土高原农业资源与环境修复重点开放实验室，陕西杨凌712100）摘要：为探讨土地利用方式对土壤碳固定的影响，以乔木、激木、草和农田等不同植被类型，纯林和混交两种裁培模式的黄土台源为对象，进行了土填碳组分研究。结果表明，不同利用方式下林地和大然草地在0一100cm土层总碳，轻组、重组、可溶性有机碳以及轻组有机碳分配比例（LFOC/SOC)均不同程度高于耕地，而其有机无机复合度（HFOC/ SOC)则低于耕地，灌木林地和天然草地这种趋势尤为突出；各种土地利用方式间，土堆总碳和HFOC/SOC在0—20 cm差异显著，总碳在60—100cm也差异明显，轻组、重组及可溶性有机碳在0—40cm，耐无机碳则在40—100cm差
关，而无机碳则与其呈负相关。轻组和可游性有机碳均与粗颗粒、易氧化有机碳以及2一0.25mm团聚体有机碳的相关性高于与细颗粒、稳态有机碳和>2mm团聚体有机碳；面重组有机碳则与之相反。轻组有机碳较有机碳、总碳、重
组以及可溶性有机碳能更敏感地反映利用方式之间的差异，可作为土壤质量变化的评价指标。关键调：黄土台娠；土地利用方式；总碳；无机碳；有机碳组分
中图分类号：S152.4
文献标识码：A
文章编号：1008-505X(2010)06141808
Soil carbon fractions under different land use types in the tablelands
oftheLoessPlateau
LIUMeng-yun，CHANG Qing-rui',YANG Xiang-yun
(Key Opening Laboratory of Agriculture Resource and Environment Renotation in the Loess Plateau, Ministry of Agriculture/ College of Resowrces and Ensironment, Northwest Agriculture and Forestry Unitersity, Yangling, Shaanxi 712100, China)
Abstract: Effects of land use types on soil organic carbon(SOC) sequestration in the tablelands of the Loess Plateau were studied in this paper. There were four vegetation types cultivated in pure and mixed planting models, namely ar-bor, shrub, grass and farmland. Soil total carbon(STC), soil inorganic carbon(SIC), density of organic carbon and dissolved organic carbon were analyzed. The results showed that concentrations of soil total carbon in O 20cm and 60 100cm were significantly different, and the light fraction( LFC) , heavy fraction( HFOC) and dissolved organic car-bon(DOC) were in O -40cm, while the soil inorganie carbon was in 40 100cm, LFOC/SOC and DOC/SOC were dif ferent in each layer, and HFOC/SOC was significantly different in O20 cm. Soil total carbon, light fraction, heavy fraction, dissolved organic carbon and LFOC/SOC of forest land and natural grass land were higher than those of farmland, while their HFOC/SOC were lower than those of farmland, and that of shrub forestland and natural grass land showed this tendency much more, Under different land uses there were significant positive correlations between soil total carbon, organic carbon, light fraction, heavy fraction, dissolved organic carbon and coarse particulate, fine particulate, easily oxidizable organic carbon, stable organic carbon and aggregate organic carbon, while there were negative correlations between inorganic carbon and organic carbon fractions. The correlation coefficients between light fraction organic carbon, diolved organic carbon and coarse particulate organic carbon,easily oxidizable organic car bon, organic carbon in aggregates with the sizes of 2-0.25 mm were bigger than those of between fine particulate or-ganic carbon, stable organic carbon and organic carbon in aggregates with the sizes of >2mm, while heavy fraction
收稿日期：2009-12-30
接受日期：2010-04-26
基金项目：国家自热科学基金项日(30872073）；陕西省白然科学基金项目（SJ08D08）资助。
作者简介：刘梦云(1973-—），女，陕西蒲城人，测教授，博土研究生，主要从事土地资源利用及地理信息系统方面的研究。
E-mail:; Imy471993@ 163. com。万方数据
→通讯作者E-mail;Changqr@nwsuaf.edu.cn