流动沙丘造林对土壤物理组分有机碳分配的影响
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《水土保持通报》编辑部;

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国家自然科学基金项目"沙漠化土地生态恢复的土壤碳截存潜力及其机理研究"(40901049);中国科学院西部之光西部博士项目(O828881001);国家重点基础研究发展计划项目(2009CB421303);兰州交通大学青蓝人才工程基金项目(QL-08-14A);内蒙古科技支撑项目(20071926)


Allocation of Soil Organic Carbon in Physical Fractions as Affected by Plantation in Mobile Sand Dune
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    摘要:

    以科尔沁沙地为研究区域,测定分析了流动沙丘栽植22a的樟子松林和24a的小叶锦鸡儿灌木林对土壤物理组分有机碳分配的影响.结果表明,(1)流动沙丘造林后土壤粗砂、极细砂和黏粉粒含量增加,细砂含量减少,土壤容重降低.(2)流动沙丘栽植樟子松和小叶锦鸡儿林后,全土有机碳储量分别增加357和514g/m2,增幅为729%和1050%.(3)流动沙丘、樟子松和小叶锦鸡儿林地土壤轻组质量分别为0.08%,1.24%和1.14%,轻组碳储量分别为9.7,182.5和185.9g/m2,占其全土碳储量的比例依次为20%,45%和33%.(4)土壤有机碳在不同粒级土壤中的分配状况为,流动沙丘:细砂>粗砂>极细砂>黏粉粒;樟子松林地:粗砂>细砂>极细砂>黏粉粒;小叶锦鸡儿林地:粗砂>极细砂>细砂>黏粉粒.(5)流动沙丘造林后,轻组有机碳储量的变化比总有机碳的变化更为明显,粗砂组分中非保护性有机质的增加是引起土壤总有机碳变化的主要原因.

    Abstract:

    Allocation of soil organic carbon in physical fractions was measured in mobile sand dune,and stabilized sand dune usingPinus sylvestris var.Mongolica(22year forest land)andCaragana microphylla(24year shrub land)in Horqin sandy land.Results show that(1)the contents of coarse sand,very fine sand andclay+silt,and electric conductivity increased while fine sand content and soil bulk density decre-ased in woodland, compared with mobile sand dune,(2)the whole SOC storage increased by 729% with an increment of 357g/m2 in forest land,and by 1050% with an increment 514g/m2 in shrub land,(3)dry organic mattersin light fractions account for 0.08%,1.24% and 1.14% of the total soil weights,while carbon storages inlight fractions are 9.7,182.5 and 185.9g/m2,accounting for 20%,45%and 33% of whole SOCs in themobile sand dune,forest land, and shrub land,respectively,(4)the allocations of SOC in particle-size fractions were in orders as fine sand>coarse sand>very fine sand>clay+ silt for the mobile sand dune,coarsesand>fine sand>very fine sand>clay+silt for the forest land,and coarse sand>very fine sand>fine sand> clay+silt for the shrub land,and(5)the variations of light fraction carbon were more sensitive than thewhole SOC after sand dune stabilization.Also,the increase of unprotected organic matter within coarse sandfraction played an important role in the change of whole SOC.

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陈银萍,李玉强,赵学勇,尚雯,罗永清,韩娟娟.流动沙丘造林对土壤物理组分有机碳分配的影响[J].水土保持通报,2011,(1):1-4

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  • 收稿日期:2010-05-06
  • 最后修改日期:2010-07-08
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  • 在线发布日期: 2012-10-25
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