农业现代化研究2026，Vol.47Issue(1)：202-212,11.DOI:10.13872/j.1000-0275.2025.1240
稻田转菜地对土壤异养呼吸的影响及其驱动因素
Impact of paddy-to-vegetable land conversion on soil heterotrophic respiration and its driving factors
摘要
Abstract
In recent years,some rice paddies in southern China have been converted to vegetable cultivation,which may lead to a loss of soil carbon stocks in these fields.However,the dynamics of soil heterotrophic respiration and its main driving factors during the initial stage of this conversion remain unclear.In this study,three treatments,including rice paddies,conventional vegetable fields,and greenhouse vegetable fields,were established in a mid-subtropical region.A one-year in situ observation was conducted to measure soil heterotrophic respiration and related environmental factors,aiming to explore the effects of rice-to-vegetable conversion on soil heterotrophic respiration and its driving mechanisms.The results showed that converting rice paddies to vegetable fields significantly increased both the rate and annual cumulative amount of soil heterotrophic respiration.The annual cumulative amounts in conventional and greenhouse vegetable fields increased by 82%and 80%compared to rice paddies,respectively,but the difference between them was not significant.Soil heterotrophic respiration rates exhibited a significant exponential relationship with soil temperature(Ts).The Q10 value of conventional vegetable fields(1.67)decreased by 8%compared to rice paddies(1.82),whereas the Q10 value of greenhouse vegetable fields(1.86)increased by 2%.The conversion from rice to vegetable fields significantly decreased soil water content(SWC)and increased the contents of nitrate nitrogen(NO3--N),ammonium nitrogen(NH4+-N),and dissolved organic carbon(DOC),thereby promoting soil heterotrophic respiration.Partial least squares path modeling indicated that soil heterotrophic respiration was significantly correlated with soil temperature(Ts)under all land-use types.Specifically,soil heterotrophic respiration in rice paddies was directly regulated by moisture,while after conversion to vegetable fields,soil respiration in conventional vegetable fields was mainly related to NO3--N content,and in greenhouse fields,it was mainly influenced by DOC content.This study reveals that soil temperature,water content,and carbon-nitrogen availability are key drivers of soil carbon emissions during the conversion of rice paddies to vegetable fields,providing empirical data for understanding soil carbon cycling under land-use change.关键词
稻田/菜地/土壤异养呼吸/温度敏感性/偏最小二乘法路径分析模型Key words
rice paddy/vegetable fields/soil heterotrophic respiration/temperature sensitivity/partial least squares path modeling(PLS-PM)分类
农业科技引用本文复制引用
王渝暄,曹家伟,邬磊,周维,王飞儿,胡荣桂,林杉,杨利..稻田转菜地对土壤异养呼吸的影响及其驱动因素[J].农业现代化研究,2026,47(1):202-212,11.基金项目
国家自然科学基金(42307344) （42307344）
湖北省农业科学院青年科学基金(2023NKYJJ11) （2023NKYJJ11）
中国电建集团昆明勘测设计研究院有限公司重点研发项目(KD-ZDYF2024-009).Supported by the National Natural Science Foundation of China(42307344) （KD-ZDYF2024-009）
the Youth Science Foundation of Hubei Academy of Agricultural Sciences(2023NKYJJ11) （2023NKYJJ11）
the Key Research and Development Project of Power China Kunming Engineering Corporation Limited(KD-ZDYF2024-009). （KD-ZDYF2024-009）
