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科尔沁沙地沙漠化过程中土壤碳氮特征分析
引用本文:李玉强,赵哈林,赵学勇,张铜会,移小勇,左小安.科尔沁沙地沙漠化过程中土壤碳氮特征分析[J].水土保持学报,2005,19(5):73-76,182.
作者姓名:李玉强  赵哈林  赵学勇  张铜会  移小勇  左小安
作者单位:中国科学院寒区旱区环境与工程研究所 甘肃兰州730000 (李玉强,赵哈林,赵学勇,张铜会,移小勇),中国科学院寒区旱区环境与工程研究所 甘肃兰州730000(左小安)
基金项目:国家自然科学基金(40471004)、中国科学院野外台站基金项目(1731690200015)资助
摘    要:对科尔沁沙地不同沙漠化阶段土壤有机碳、全氮含量、土壤质地以及碳氮密度进行了测定与分析。结果表明,沙漠化过程中不同阶段的特征体现在土壤碳、氮、颗粒组成的有规律变化,土壤碳、氮含量衰减,质地变粗;从潜在沙漠化阶段到严重沙漠化阶段,100 cm深土壤有机碳和全氮含量分别下降91.6%和85.8%,有机碳密度从4 877.9(C)g/m2下降到481.8(C)g/m2,全氮密度从518.0(N)g/m2下降到89.4(N)g/m2;土壤有机碳、全氮与土壤细颗粒组分(<0.1mm)含量之间表现为同增同减性;沙漠化初期有机碳、氮衰减速率要快于沙漠化后期;沙漠化过程中土壤C/N比呈递减趋势,土壤有机碳衰减速率要快于全氮。

关 键 词:沙漠化  土壤  碳氮特征  科尔沁沙地
文章编号:1009-2242(2005)05-0073-04
收稿时间:2005-04-04
修稿时间:2005-04-04

Characteristics of Soil Carbon and Nitrogen During Desertification Process in Horqin Sandy Land
LI Yu-qiang,ZHAO Ha-lin,ZHAO Xue-yong,ZHANG Tong-hui,YI Xiao-yong,ZUO Xiao-an.Characteristics of Soil Carbon and Nitrogen During Desertification Process in Horqin Sandy Land[J].Journal of Soil and Water Conservation,2005,19(5):73-76,182.
Authors:LI Yu-qiang  ZHAO Ha-lin  ZHAO Xue-yong  ZHANG Tong-hui  YI Xiao-yong  ZUO Xiao-an
Institution:Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000
Abstract:Soil organic carbon and total nitrogen concentrations,soil texture,and carbon and nitrogen densities in different stages of desertification process(Potential,Light,Medium,Severe,and Most severe desertification) in Horqin sandy land were studied.The results showed that along the spectrum from potential desertification to most severe desertification,soil organic carbon and nitrogen concentrations decreased by 91.6% and 85.8%,respectively,to a depth of 100 cm,versus decreases of 95.7% for the fine particle size fractions(<0.1 mm).Carbon density decreased from 4 877.9 to 481.8(C) g/m~2 during deserification process,whereas nitrogen density decreased from 518.0 to 89.4(N) g/m~2.Regression analysis revealed significant positive relationships amongthe soil carbon concentration,soil nitrogen concentration,and soil fine particle size fractions(<0.1 mm) content for all five stages.Soil carbon and nitrogen were lost more rapidly during the initial stages of desertification than the later stages.The soil C/N ratio decreased from 9.385 to 5.541 along the desertification developing.There was a greater proportional decline in soil carbon than in nitrogen.
Keywords:desertification  soil  characteristics of carbon and nitrogen  Horqin Sandy Land
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