Effects of legume\|wheat multi\|cropping system on the soil aggregates and carbon and nitrogen contents in the hilly area of Western Henan Province |
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DOI:10.7606/j.issn.1000-7601.2021.03.18 |
Key Words: soybean\|wheat multiple cropping system peanut\|wheat multiple cropping system soil aggregates organic carbon total nitrogen Western Henan hilly region |
Author Name | Affiliation | QIAO Xinxin | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | LI Qianyun | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | WANG Yanfang | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | YIN Fei | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | JIAO Nianyuan | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | FU Guozhan | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | LIU Ling | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China |
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Abstract: |
为了探究豆-麦复种模式对豫西旱作农田土壤团聚体稳定性及C、N含量的影响,在2014—2019年采用田间定位试验,设置玉米-小麦复种模式(CK)、花生-小麦复种模式(PW)和大豆-小麦复种模式(SW)3个处理。于2019年10月采集0~20 cm和20~40 cm土层土壤样品,利用湿筛法分析了土壤水稳性团聚体组成、稳定性以及团聚体各粒级有机碳和全氮含量。结果表明:土壤水稳性团聚体主要分布在0.25~2 mm粒级(占40.6%~64.9%),与CK相比,PW和SW处理可显著增加0~20 cm和20~40 cm土层>2 mm、0.25~2 mm粒级水稳性团聚体比重。在0~20 cm土层,PW和SW处理下>0.25 mm水稳性团聚体(WR0.25),与CK相比分别显著增加11.0%、15.3%,土壤不稳定团粒指数(ELT)分别显著降低20.7%、34.2%,土壤团聚体平均质量直径(MWD)分别显著增加7.7%、20.4%,几何平均直径(GMD)分别显著增加25.5%和42.4%,分形维数(D)分别显著降低10.2%、14.5%。PW和SW处理使0~20 cm土层>2 mm粒级团聚体有机碳、全氮含量分别较CK增加18.1%、51.2%和24.5%、81.6%,0.25~2 mm粒级团聚体有机碳、全氮含量分别较CK增加20.1%、29.9%和21.2%、24.6%,3 种复种模式下0~20 cm土层的有机碳、全氮含量高于20~40 cm土层。SW处理在0~20 cm土层的>2 mm、0.25~2 mm、<0.053 mm粒级团聚体对土壤C和N的贡献率显著高于CK处理,分别高出143.1%、14.6%、39.2%和105.6%、13.9%、53.2%。综上所述,大豆-小麦复种模式长期种植能显著提升土壤C、N含量,促进土壤大团聚体的形成和稳定,对改善农田0~20 cm耕层土壤团聚体稳定性具有显著的效果。 |
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