摘要
为揭示不同轮作模式下潮土土壤团聚体及其有机碳含量变化规律,于2018-2019年在山西大同进行了田间试验.设置处理为油菜—荞麦(RB)、玉米—荞麦(CB)、马铃薯—荞麦(PB)和燕麦—荞麦(OB)4种轮作模式,荞麦—荞麦(BB)连作和休闲—休闲(FF)为对照,测量指标为土壤团聚体组成、稳定性和团聚体内有机碳分布.结果显示:与连作模式(荞麦—荞麦)相比,各轮作模式均提高了土壤大团聚体数量和稳定性;油菜—荞麦(RB)轮作模式0-60 cm土层的大团聚体含量均增加,其0-20 cm土层的平均重量直径(MWD)、几何平均直径(GMD)增幅为5%和7%,20-40 cm土层的团聚体R0.25、MWD、GMD值增幅为8%、26%和37%.各轮作模式土壤有机碳主要富集在土壤表层,且>3 mm粒级土壤团聚体中有机碳含量对整个土壤有机碳含量和土壤有机碳库的贡献率最高.同时,各轮作模式0-20 cm土层各个粒级团聚体的有机碳含量均显著增加,油菜—荞麦(RB)轮作模式20-40 cm土层各个粒级团聚体的有机碳含量显著增加,随粒径级数递减其增幅分别为41%、49%、72%和39%,其>3 mm粒级团聚体的有机碳储量及贡献率也最高.总之,轮作有利于增加土壤团聚体的有机碳含量,可改善土壤团聚体组成及稳定性,增加土壤的固碳能力,但不同轮作模式间有差异.本研究表明油菜—荞麦轮作更有利于土壤固碳,可以在研究区域作为重要轮作模式进行推广和应用.(图2表5参41)
In order to reveal the change rule of soil aggregates and organic carbon content in fluvo-aquic soil under different crop rotation patterns, a field trial was conducted in Datong, Shanxi Province, China, between 2018 and 2019. In the experiment, four treatments were implemented: rape-buckwheat(RB), corn-buckwheat(CB), potato-buckwheat(PB), and oat-buckwheat(OB). Buckwheat buckwheat(BB) and fallow-fallow(FF) were used as controls. The soil aggregate composition, stability, and organic carbon distribution were studied. The results showed that crop rotation increased the number and stability of soil macro-aggregates compared to continuous cropping. Under the RB treatment, the macro aggregates contents increased within the 0-60 cm soil depth, and the average weight diameter(MWD) and geometric average diameter(GMD) of 0-20 cm soil depth were significantly increased by 5% and 7%, while the soil aggregates R0.25, MWD, and GMD of the 20-40 cm soil depth were significant increased by 8%, 26%, and 37%, respectively. Soil organic carbon was enriched in the soil surface under different crop rotations, and highly contributed to the total soil organic matter and pools in the > 3 mm aggregates of soil. Meanwhile, the organic carbon of each level of soil aggregates of 0-20 cm soil depth under different crop rotations, and that of 20-40 cm soil depth under the RB treatment were significantly increased. With the decrease in particle sizes of soil aggregates under the RB treatment, the soil organic carbon increased by 41%, 49%, 72%, and 39%, respectively, and the > 3 mm aggregates of soil contributed to the total organic carbon content and pools. In general, crop rotation can increase the organic carbon content of soil aggregates, improve the composition and stability of soil aggregates, and increase the carbon fixation capacity of soil. However, differences exist under different rotation patterns. Therefore, we concluded that RB rotation is more conducive to soil carbon sequestration and can be used as an ideal rotation model in t
作者
范倩玉
刘振华
李晋
班旦赤列
杨珍平
薛建福
黄春国
高志强
FAN Qianyu;LIU Zhenhua;LI Jin;Bandanchilie;YANG Zhenping;XUE Jianfu;HUANG Chunguo;GAO Zhiqiang(College of Resources and Environment,Shanxi Agricultural University,Taigu 030801,China;College of Agriculture,Shanxi Agricultural University,Taigu 030801,China)
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2021年第1期81-88,共8页
Chinese Journal of Applied and Environmental Biology
基金
国家公益性行业农业科研专项(201503120)
山西农谷建设科研专项(SXNGJSKYZX201701)
山西省“1331工程”作物生态与旱作栽培生理重点实验室建设计划(201705D111007,[2017]14)
山西省“1331工程”有机旱作与栽培生理创新团队建设计划(晋教科[2018]4)
山西省教育厅“黄土高原特色作物优质高效生产协同创新中心”建设计划(晋教科[2016]5)
山西省研究生教育创新项目(2020SY190)资助。
关键词
轮作模式
土壤团聚体
有机碳
有机碳储量
有机碳贡献率
rotation mode
soil aggregate
organic carbon
organic carbon storage
contribution rate of organic carbon
