黑龙江农业科学Issue(5)：50-58,66,10.DOI:10.11942/j.issn1002-2767.2025.05.0050
施肥方式对陇东黄土丘陵沟壑区玉米田土壤团聚体分布及有机碳的影响
Effects of Fertilization Methods on Soil Aggregate Distribution and Organic Carbon in Maize Fields in Loess Hilly-Gully Region of Eastern Gansu Province
摘要
Abstract
In order to enhance soil fertility in the Loess Plateau and Loess Gully Region of Longdong and promote the green and low-carbon development of agriculture.In this study,four nitrogen levels(N0,N1,N2,N3)were set and nitrogen application rates were 0,100,200,300 kg·ha-1,respectively,based on the maize breeding base of Yaodian Town in Pingliang,Gansu Province.Organic fertilizer was treated in two levels(N0+M,N1+M,N2+M,N3+M)and untreated(N0,N1,N2,N3),to explore the effects of different fertilization methods on the stability of soil aggregates and the carbon sink capacity of the soil in this area.The results showed as follows:(1)Under each fertilization treatment in 0-60 cm soil layer,the soil aggregate content was the highest in 2-5 mm grain grade,and the content in 60-80 cm soil layer was the highest in＜0.25 mm grain grade.(2)Combined application of organic fertilizer significantly increased the soil mean mass diameter(MWD),geometric mean diameter(GMD)and large aggregate content(Rm0.25)in 0-40 cm soil layer,and decreased the fractal cone number D and erodible factor K.Combined application of fertilizer at 200 kg·ha-1 had the largest effect on soil MWD,GMD and Rm0.25.The number of fractal cones D and erodibility factor K were the lowest.(3)In the 0-60 cm soil layer,the organic carbon content reached the maximum when the grain level was＜0.25 mm,and the soil organic carbon of each grain level gradually decreased with the increase of soil depth.In the 0-40 cm soil layer,the contribution rate of organic carbon was the highest in 2.00-5.00 mm granular aggregates,and the combined application of chemical fertilizer significantly increased the organic carbon content of each grain and the contribution rate of large aggregates to organic carbon.(4)There was no significant effect on GMD,MWD,soil erodibility factor K,and soil organic carbon content of each particle size in different soil layers.In conclusion,in the Loess Hilly and Gully Region of Eastern Gansu Province,the combined application of organic fertilizer can significantly improve the soil structure of 0-40 cm soil layer,improve soil stability and enhance soil carbon sink capacity,and the best effect is achieved when the nitrogen application rate is 200 kg·ha-1.关键词
施肥/陇东黄土丘陵沟壑区/土壤团聚体/稳定性/有机碳Key words
fertilize/Longdong Loess Hilly and Gully Region/soil aggregate/stability/organic carbon引用本文复制引用
李文文,王工作,韩芬,何倩,段义字,刘家溪..施肥方式对陇东黄土丘陵沟壑区玉米田土壤团聚体分布及有机碳的影响[J].黑龙江农业科学,2025,(5):50-58,66,10.基金项目
平凉市科技人才专项计划项目(PL-STK-2023A-029). （PL-STK-2023A-029）
