土壤学报2026，Vol.63Issue(1)：251-264,14.DOI:10.11766/trxb202502100053
模拟高温-降水对培肥土壤CO2排放及可溶性有机质的影响
Effects of Simulated High Temperature and Precipitation on CO2 Emissions and Dissolved Organic Matter in Fertilized Soil
摘要
Abstract
[Objective]Organic fertilization is one of the most important measures to maintain the fertility level of agricultural soil.However,it is still unclear whether soil fertilization can effectively cope with the frequent occurrence of compound extreme weather events and maintain the stability of soil organic carbon(SOC).Moreover,soil dissolved organic matter(DOM)is an important indicator to measure the dynamic changes of SOC and also a core participant in the process of SOC accumulation and stability.Nevertheless,it is still unclear how extreme weather events may affect DOM and consequently its contribution to SOC accumulation and stability.[Method]A short-term simulation experiment was conducted using rice paddy soils,and headspace gas sampling,gas chromatography,ultraviolet-visible absorption and fluorescence spectroscopy were applied to compare the effects of high temperature(32℃)-precipitation on the emission of CO2 and spectral characteristics of soil DOM in different fertilized soils(PK:phosphorus-potassium fertilizer;NPK:nitrogen-phosphorus-potassium fertilizer,LOM:low-volume organic manure;and HOM:high-volume organic manure).[Result]The results revealed that(1)the variation range of cumulative soil CO2 emissions in the organic fertilization treatments(LOM and HOM)was relatively small,ranging from 8.92%to 14.17%during high-temperature or high-temperature after precipitation incubations.This effectively increased the resilience of organically fertilized soil in response to external high temperature-precipitation events.(2)Compared with the first day(Day 1)of high-temperature incubation,the soil DOM content in LOM and HOM treatments significantly increased by 7.81-14.74 mg·kg-1(P<0.05).However,the HOM treatment significantly reduced the soil DOM aromaticity(SUVA254),hydrophobicity(SUVA260),and various fluorescent substances,indicating that under high temperature stress,organic fertilization only changed the structural composition of soil DOM and did not promote the emission of CO2.(3)High temperature incubation after precipitation(Day 28)significantly reduced the soil DOM content by 64.05%-80.44%(P<0.05)when compared with Day 14.Also,organic fertilization significantly increased the SUVA254 and SUVA260 indices of soil DOM and the humification index(HIX)compared with other treatments,thereby reducing CO2 emissions.The increase in protein-like substances(fluorescence peaks B and T)caused by organic fertilizer itself did not lead to an increase in soil CO2 emissions.[Conclusion]Overall,organic fertilization,especially the organic substitution of 25%-50%nitrogen fertilizer,can improve the stability of soil organic carbon,enhance its agricultural adaptability in extreme weather events under the conditions of this study.The findings of this study provide a scientific basis for optimizing agricultural fertilization models,and promoting sustainable agricultural development.关键词
高温-降水/CO2排放/土壤DOM/三维荧光光谱/紫外光谱Key words
High temperature-precipitation/CO2 emission/Soil DOM/Three-dimensional fluorescence spectroscopy/Ultraviolet spectroscopy分类
农业科技引用本文复制引用
王森辕,李星宇,熊维亮,黄玉珠,王昌全,李冰,黄容..模拟高温-降水对培肥土壤CO2排放及可溶性有机质的影响[J].土壤学报,2026,63(1):251-264,14.基金项目
四川省科技厅项目(2025YFHZ0142,25NSFJQ0002)、四川省大学生创新训练计划项目(S202410626058)和国家重点研发计划项目(2022YFD1901605)共同资助 Supported by the Natural Science Foundation of Sichuan Province(Nos.2025YFHZ0142,25NSFJQ0002),Innovation Training Program for College Students in Sichuan Province(No.S202410626058)and the National Key Research and Development Program of China(No.2022YFD1901605) （2025YFHZ0142,25NSFJQ0002）
