LI Wenwen,WANG Gongzuo,HAN Fen,et al.Effects of Fertilization Methods on Soil Aggregate Distribution and Organic Carbon in Maize Fields in Loess Hilly-Gully Region of Eastern Gansu Province[J].HEILONGJIANG AGRICULTURAL SCIENCES,2025,(05):50-58,66.[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
- Title:
- Effects of Fertilization Methods on Soil Aggregate Distribution and Organic Carbon in Maize Fields in Loess Hilly-Gully Region of Eastern Gansu Province
- 文章编号:
- 8
- Keywords:
- fertilize; Longdong Loess Hilly and Gully Region; soil aggregate; stability; organic carbon
- 文献标志码:
- A
- 摘要:
- 为提高陇东黄土丘陵沟壑区土壤肥力，促进农业绿色低碳发展，基于甘肃平凉窑店镇玉米种养基地，设4个氮水平（N0、N1、N2、N3），施氮量分别为0，100，200，300 kg·hm-2；有机肥为副处理，设配施（N0+M、N1+M、N2+M、N3+M）和不配施2个水平（N0、N1、N2、N3），探究不同施肥方式对该地区土壤团聚体稳定性及土壤碳汇能力的影响。结果表明，（1）0~60 cm土层各施肥处理下土壤团聚体均以2~5 mm粒级含量最高，60~80 cm土层以<0.25 mm粒级含量占比最高。（2）化肥有机肥配施能够显著增加0~40 cm土层土壤平均质量直径（MWD）、几何平均直径（GMD）和大团聚体含量（Rm0.25），降低分形锥数D和可侵蚀因子K，在施氮量200 kg·hm-2配施化肥时土壤MWD、GMD、Rm0.25均达到最大，分形锥数D和可侵蚀因子K达到最低。（3）在0~60 cm土层有机碳含量均在粒级<0.25 mm达到最大，土壤各粒级土壤有机碳随着土层深度增加而逐渐减少。在0~40 cm土层各处理均以2.00~5.00 mm粒级团聚体对有机碳贡献率最大，化肥有机肥配施显著增加了土壤各粒级有机碳含量及大团聚体对有机碳贡献率。（4）在不同土层单施化肥施氮量对GMD、MWD、土壤可侵蚀因子K、土壤各粒径有机碳含量无显著影响。综上，在陇东黄土丘陵沟壑区，化肥有机肥配施可显著改善0~40 cm土层土壤结构，提高土壤稳定性、提升土壤肥力，增强土壤碳汇能力，且施氮量在200 kg·hm-2时配施化肥提升效果最好。
- 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.
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备注/Memo
收稿日期：2024-01-20 基金项目：平凉市科技人才专项计划项目（PL-STK-2023A-029）。 第一作者：李文文（1997-），女，硕士，助理工程师,从事水土保持以及相关科学研究。E-mail：3190465091@qq.com。 通信作者：王工作（1988-），男，学士，高级工程师，从事水土保持以及相关科学研究。E-mail：1322942522@qq.com。