盐渍化弃耕地不同恢复年限土壤有机碳及其碳库管理指数变化  

Changes of soil organic carbon and its carbon-pool management index in deserted salinized fields with various reclamation histories

作　　者：闫靖华[1,2] 张凤华[1] 

机构地区：[1]石河子大学/新疆兵团绿洲生态农业重点实验室,新疆石河子832003 [2]新疆博州农业技术推广中心,新疆博州833400

出　　处：《干旱地区农业研究》2015年第2期203-207,213,共6页Agricultural Research in the Arid Areas

基　　金：教育部科学技术研究项目(213039A);国家自然科学基金(31360320);兵团科技计划专项(CX8927)

摘　　要：对干旱区盐渍化弃耕地不同恢复年限土壤有机碳及其碳库管理指数的变化进行分析,结果表明,弃耕地恢复初期土壤有机碳及活性有机碳(LOC)含量均低于弃耕地(CK),恢复3年(R3)、恢复5(R5)年和恢复10(R10)年的LOC都显著高于弃耕地,分别高出20.28%、16.00%和16.45%,土壤有机碳及活性有机碳含量均随着土层加深而降低,土壤碳库管理指数CMI在恢复初期低于CK,随着恢复年限的增加,R3,R5,R10土壤CMI显著高于CK 54.72%、19.79%和17.73%,R3、R5和R10分别是R1的3.20、2.48和2.43倍,表明干旱区盐渍化弃耕地经垦殖恢复后显著改善了土壤碳库质量,增加了土壤碳汇功能。相关分析表明,土壤LOC和CMI与土壤Olsen-P呈显著正相关关系,与TOC相比更能反映不同恢复年限土壤碳库的变化。Soil organic carbon plays an important role in the soil ecosystems .This paper studied changes of soil or-ganic carbon and carbon-pool management index （CMI） deserted salinized fields with different reclamation history .Re-sults showed that soil organic carbon and active organic carbon were decreased with depth of soil layer .Soil organic car-bon was decreased in the first year after the reclamation ,the soil labile organic carbon （LOC） of R3 ,R5 and R10 was 20 .28% ,16 .00% and 16 .45% respectively higher than that in the control ,reaching significant levels .Soil carbon-pool management index （CMI） was lower than CK during early reclamation stage .With reclamation forwarding ,CMIs of R3 ,R5 and R10 were 54 .72% ,19 .79% and 17 .73% higher than CK ,respectively .R3 ,R5 ,and R10 were 3 .20 , 2 .48 ,and 2 .43 times as much as R1 .All above indicated that soil quality was improved to a certain degree after a long-term restoration of the salinized field ,and soil carbon sink was also enhanced .Correlation analysis showed that LOC and CMI were significant positive correlated to soil Olsen-P .LOC and CMI could reflect the changes of soil carbon pool in different years of reclamation ,better than TOC .

关 键 词：活性有机碳 土壤碳库 复垦年限 弃耕地 

分 类 号：S153.6[农业科学—土壤学]