不同氮水平下秸秆和活性碳对土壤不同粒级碳的影响  

Effects of Straw and Active Carbon on Soil Carbon in Different Sized Particle under Different N Levels

作　　者：马红亮[1] 朱建国[2] 谢祖彬[2] 刘钢[2] 曾青[2] 

机构地区：[1]福建师范大学地理科学学院,福建省亚热带资源与环境重点实验室,福建福州350007 [2]中国科学院南京土壤研究所,土壤与农业可持续发展国家重点实验室,江苏南京210008

出　　处：《环境科学研究》2008年第1期107-112,共6页Research of Environmental Sciences

基　　金：中国科学院创新方向项目(KZCX3-SW-440,KZCX2-SW-133);国家自然科学基金重点项目(40231003,40110817);国家自然科学基金重大项目(NSFC-40571157);国家重点基础研究发展计划(973)项目(2002CB714003);福建省青年科技人才创新项目(2007F3020)

摘　　要：利用采集自FACE(Free Air Carbon Dioxide Enrichment)技术平台上田间培养的土壤样品,通过温室培养的方法,研究不同CO2浓度下导致作物生物量增加和更多碳输入对土壤含碳量的影响.结果表明,CO2浓度高(即通过秸秆还田和根系进入土壤的含碳量增加)时,其显著影响碳在不同粒级土壤中的转化,粒径>53μm土壤的含碳量增加,粒径<53μm土壤的含碳量降低;在没有秸秆加入的常规氮水平下与有秸秆加入的低氮水平下,含碳量变化幅度较大;单位土壤各粒级的含碳量均有增加,有秸秆加入,活性碳(葡萄糖)量越大,含碳量增加幅度越大;没有秸秆加入,活性碳量越大,总碳含量增加幅度越小.而不同氮水平下秸秆的分解代谢对土壤不同粒级碳的影响还不明确,有待继续研究.To study the change of soil carbon affected by increase of crops biomass and more carbon input in soil due to elevated CO2 concentration, a culture experiment on soil from field under Free Air Carbon Dioxide Enrichment （FACE） platform with two CO2 levels （Ambient CO2 and Elevated COs ） and two N levels （Normal N and Low N） was conducted in greenhouse at the same N treatments with field. Results indicated that compared to soil from ambient COs concentration, turnover of different soil particle in soil from Elevated CO2 concentration was increased significantly and resulted in an increase of soil carbon amount in 〉 53 μm and decrease in 〈 53μm. The change was larger at Normal N with no straw and at Low N with straw added. Carbon amount in bulk soil was increased and it increased more in treatment with increasing of active carbon into soil from root with straw ; it was reverse with no straw treatment. However, the effects of decomposition of straw on carbon in different particle-size were dependent on it at different N levels and this was known poor and need more work to carry out.

关 键 词：CO2浓度 活性碳 作物秸秆 土壤颗粒 土壤含碳量 

分 类 号：S152.4[农业科学—土壤学]