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《黄土丘陵区几种退耕还林地土壤固存碳氮效应.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、农业环境科学学报2012,3l(6):l172—1179JournalofAgro—EnvironmentScience黄土丘陵区几种退耕还林地土壤固存碳氮效应韩新辉1,一,杨改河1,一,佟小刚3,冯永忠1,一,任广鑫l’2,赵发珠z.,,杜约翰l’2(1.西北农林科技大学农学院,陕西杨凌712100;2.陕西省循环农业.1:程技术研究中心,陕西杨凌712100;3.西北农林科技大学资环学院,陕西杨凌712100;4.西北农林科技大学林学院,陕西杨凌712100)摘要:探讨了黄土丘陵区退耕10a和30a的柠条、刺槐、油松及侧柏林地o~60cm不同土层有机碳.氮数量和分布的
2、变化特征。结果表明:相比坡耕地,退耕还林10a后,仅侧柏与油松林地各土层有机碳、氮含量和密度显著提升。退耕还林30a与10a相比,各土层有机碳含虽增幅表现为侧柏>油松>刺槐>柠条,总体0-60cm土层碳同存速率分别达到1.06、0.71、0.43、0.36mgc·hm-2·a‘1;氮固存速率以刺槐最高,达到0.051m刚·hm七a一,其他还林地同存氮速率接近,为0.014—0.026mgN·hmq·a-1。30a还林有机碳的增加主要米自O~20cm土层,平均贡献达51.9%,而会氮增加除刺槐林地外,主要来自40—60cm土层,平均贡献达42.5%。各还林地C/N仅在0—2
3、0ca表层均有显著提高,但有机碳与氮均表现出显著的回归相关性。综上,长期退耕还林地能够固存碳氮.且以侧柏林地提升有机碳库较佳,而刺槐林地提升氮库较好。关键词:退耕还林;土壤有机碳;土壤全氨;黄土丘陵区中图分类号:S18I文献标志码:A文章编号:1672—2043(2012)06—1172-08SoilCarbonandNitrogenSequestrationUnderSeveralDifferentForestLandsConvertedbyFarmlandinLoessHillyAreaHANXin-hui。‘YANGGai-he‘一,TONGXiao-gan93,F
4、ENGYong-zhon91tRENGuang-xin”,ZHAOFa-zhu2+4,DUYue—hunl。(1.CollegeofAgriculturalSciences,NorthwestAgricultural&ForestryUniversity,Yangling712100,China;2.ResearchCenterofRecycleAgriculturalEngineeringandTechnologyofShannxiProvince,Yanglin9712100,China;3.CollegeofSourceandEnvironment,Northwes
5、tA-gricuhural&ForestryUniversity,Yangling712100,China:4.CollegeofForestry,NorthwestAgricultural&ForestryUniversity,Yangling712100,China)Abstract:Thisuesearchwasconductedtodeterminethechangeofsoilorganiccarbonandnitrogenin0-60cmsoillayersunderfourtypesforestedlands:Caragana,rohinia,Chinese
6、pineandorientalis,whichhasbeenconvertedbyfarmlandforloyearsand30yearsinloesshiUyarea.Theresultsshowedthat,comparedwithslopedfarmland,eithercontentordensityofsoilorganiccarbonandnitrogenindifferentsoillayersweresignificandyincreasedinChinesepineandorientalisforestland'after10yearsforestati
7、on.Comparedwith10yearsforestation,thesoilorganiccarbonandnitrogenwasfurtherincreasedafter30yearsforestation,wiflltheorderoforgatficcarbon:orientalis>Chinesepine>robinia>caragana,andthatorganiccarbonsequestrationrate(0-60Cmsoillayers)reachedl.06,O.71,0.43,O.36mg【=·hm
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