Variations in soil aggregate distribution and associated organic carbon and nitrogen fractions in long-term continuous vegetable rotation soil by nitrogen fertilization and plastic film mulching

塑料薄膜 护根物 土壤碳 人类受精 氮气 农学 氮肥 骨料(复合) 环境科学 化学 土壤水分 土壤科学 材料科学 生物 图层(电子) 复合材料 有机化学
作者
Fangli Wang,Yu Liu,Bin Liang,Jun Liu,Haiying Zong,Xiaohong Guo,Xuexia Wang,Ningning Song
出处
期刊:Science of The Total Environment [Elsevier BV]
卷期号:835: 155420-155420 被引量:33
标识
DOI:10.1016/j.scitotenv.2022.155420
摘要

Small changes in soil aggregates-associated organic carbon (OC) can induce huge fluctuations in greenhouse gas emissions. However, there is a knowledge gap on the responses to nitrogen (N) fertilization under plastic film mulching, especially in long-term continuous rotation systems. This study assessed the impacts of plastic film mulching and N fertilization on the soil aggregate distribution and associated OC and N fractions in a 10-year continuous cucumber-cabbage rotation soil (0–40 cm). The impacts also were further quantified using the design of experiment (DOE) method. Plastic film mulching alleviated the impact of N fertilization on soil aggregate stability, which declined under higher N doses. Plastic film mulching coupled with N fertilization resulted in higher contents of soil OC and dissolved OC in macroaggregates but lower contents in silt+clay- aggregates. The total N and dissolved organic N (DON) contents in different aggregates varied significantly with N application doses, and the alternations were impacted by plastic film mulching, which improved the DON distribution in larger agglomerates, especially at medium and high N doses. Soil aggregate distribution and associated OC and N fractions did not show consistent trends in different soil depths, which was attributed to the contributions of plastic film mulching, N fertilization and their interactions. The study suggests that N fertilizer should be applied under plastic film mulches at appropriate levels to improve C assimilation and soil fertility and promote the sustainable development of long-term vegetable rotation systems.
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