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保护性耕作下土壤团聚体组成及其有机碳分布特征
引用本文:黄丹丹,刘淑霞,张晓平,许继平,吴立君,娄玉杰.保护性耕作下土壤团聚体组成及其有机碳分布特征[J].农业环境保护,2012(8):1560-1565.
作者姓名:黄丹丹  刘淑霞  张晓平  许继平  吴立君  娄玉杰
作者单位:[1]吉林农业大学资源与环境学院,长春130118 [2]中国科学院东北地理与农业生态研究所,长春130012 [3]东辽县安石镇农业站,吉林东辽136616 [4]东辽县金洲乡农业站,吉林东辽136613: [5]吉林农业大学动物科技学院,长春130118
基金项目:吉林省教育厅“十二五”科学技术研究项目(216-172);吉林省科技发展计划项目(20110202);吉林省科技引导计划项目(201205057);现代农业产业技术体系建设专项资金资助(nyeytx一38)
摘    要:依据吉林省德惠市田间定位试验(始于2001年),对玉米-大豆轮作和玉米连作模式下秋翻(MP)、垄作(RT)和免耕(NT)3种耕作方式的机械稳定性团聚体和水稳性团聚体粒级分布、水稳性团聚体有机碳含量及团聚体稳定性进行了研究。结果表明,3种耕作方式下,〉0.25 mm机械稳定性团聚体含量均在70%以上,最高可达93.29%,各粒级含量在两个土层中表现规律性不强。水稳性团聚体含量均在20%以上,最高可达35.5%,且表层高于底层。与干筛法测定的团聚体相比,〉0.25 mm团聚体含量明显减少,最大减少幅度为58.76%。两个土层中玉米-大豆轮作和玉米连作下的机械稳定性团聚体与水稳性团聚体对耕作处理的响应表现出一定的相似性,即RT〉NT〉MP。水稳性团聚体有机碳含量随粒径的减小而增大,3种耕作方式下有机碳含量表现为NT〉RT〉MP,表层高于底层,且玉米-大豆轮作高于玉米连作。比较3种耕作方式,垄作更有利于团聚体的形成和稳定,且玉米-大豆轮作好于玉米连作。

关 键 词:保护性耕作  团聚体  有机碳

Constitute and Organic Carbon Distribution of Soil Aggregates Under Conservation Tillage
HUANG Dan-dan,LIU Shu-xia,ZHANG Xiao-ping,XU Ji-ping,WU Li-jun,LOU Yu-Jie.Constitute and Organic Carbon Distribution of Soil Aggregates Under Conservation Tillage[J].Agro-Environmental Protection,2012(8):1560-1565.
Authors:HUANG Dan-dan  LIU Shu-xia  ZHANG Xiao-ping  XU Ji-ping  WU Li-jun  LOU Yu-Jie
Institution:1.College of Resources and Environmental Science, Jilin Agricultural University, Changchun 130118, China; 2.Northeast Institute of Geog- raphy and Agroecology, Chinese Academy of Sciences, Changchun 130012, China; 3.Agricuhural Station of Anshi Township in Dongliao, Dongliao 136616, China; 4.Agricuhural Station of Jinzhou Township in Dongliao, Dongliao 136613, China; 5.College of Animal Science and Technology, Jilin Agricultural University, Changchun 130118, China)
Abstract:Basing on a 9 years(2001-2010) stationary field experiment conducted in black soil of Dehui City, Jilin Province, the effects of three tillage treatments (no-tillage, ridge tillage, moldboard plow) and two cropping treatments (corn-soybean rotation, continuous corn ) on the mechanical stable aggregates, the water stable aggregates size distribution, the content of organic carbon in water stable aggregates, and the aggregate stability were evaluated. The results showed that the average content of mechanical stable aggregates was between 70% and 93.3% under the three tillage treatments. There was no obvious regularity for the content of each aggregate size fraction between the surface (0-20 cm ) and bottom( 20-40 em ) layer of soil. The content of water stable aggregates was between 20% and 35.5%, which was higher in the 0-20 cm than in the 20-40 cm layer of soil. Compared with the aggregate from the dry sieving method, the content of 〉0.25 mm aggregate significantly decreased( up to 58.76% ). Mechanical stable aggregates and water stable aggregates showed similarly response to the tillage treatments, i.e. ridge-tillage (RT) 〉no tillage (NT) 〉moldboard plow ( MP ). With the decrease of particle size, the content of organic carbon in the water stable aggregates increased in the order NT〉RT〉MP, surface layer〉bottom layer, and corn-soybean rotation〉continuous com. RT followin corn-soybean rotation is more benefit for the formation and stabilization of soil aggregates.
Keywords:conservation tillage  aggregate  organic carbon
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