文献类型：期刊文献

中文题名：施肥与光叶苕子覆盖对柑橘园土壤N_(2)O排放短期影响及其驱动因素

英文题名：The short?term impact of fertilization and smooth vetch cover on soil nitrous oxide emissions in citrus or?chards and the driving factors

作者：杨洪炳[1,3] 曾立雄[1,2,3] 雷蕾[1,2,3] 杨鑫[1,3] 张佳佳[1,3] 黄志霖[1,2,3] 肖文发[1,2,3]

第一作者：杨洪炳

机构：[1]中国林业科学研究院森林生态环境与自然保护研究所,国家林业和草原局森林生态环境重点实验室,北京100091;[2]南京林业大学南方现代林业协同创新中心,南京210037;[3]湖北秭归三峡库区森林生态系统国家定位观测研究站,湖北秭归443699

年份：2025

卷号：44

期号：7

起止页码：2218-2228

中文期刊名：生态学杂志

外文期刊名：Chinese Journal of Ecology

收录：;北大核心:【北大核心2023】；

基金：国家自然科学基金项目(32130074);中国林科院基本科研业务专项(CAFYBB2022XD001)资助。

语种：中文

中文关键词：三峡库区;施肥;生草覆盖;氧化亚氮(N_(2)O);团聚体稳定性;微生物营养限制

外文关键词：Three Gorges Reservoir Area;fertilization;grass mulching;nitrous oxide(N_(2)O);aggregate stability;microbial nutrient limitation

分类号：S666

摘要：研究土壤氧化亚氮(N_(2)O)排放与环境因素的关系及其对管理措施变化的响应,对长江三峡库区估算土壤温室气体排放潜力、改善面源污染问题和柑橘园经营管理有重要意义。为探究长江三峡库区管理措施对柑橘园土壤理化性质、N_(2)O排放通量和微生物特性的影响及N_(2)O排放的调控机制,选取施肥+光叶苕子覆盖(V)、施肥+清草(T)和不施肥+光叶苕子覆盖(NF)3种管理措施下0~10 cm的土壤为研究对象。结果表明:施肥提高了整体土壤酶活性5.12%,且降低了土壤团聚体的水稳定性14.84%,光叶苕子覆盖则降低了整体土壤酶活性10.31%,而对团聚体稳定性无显著影响。施肥增加了土壤N_(2)O排放通量,而光叶苕子覆盖则相反。土壤N_(2)O与其他气体排放通量之间关联性不强。土壤温室气体和氨气的排放通量,在T和NF处理下易受土壤碳氮比和硝态氮含量影响,而V处理下易受土壤pH和含水量影响。N_(2)O排放通量受土壤总孔隙度、阳离子交换量和碳磷阈值比的显著影响。同时,土壤微生物生长与代谢受氮限制,而施肥和光叶苕子覆盖能降低其氮限制程度,且主要通过影响土壤温度直接作用于粉粒含量、水稳性团聚体的平均重量直径和硝酸还原酶活性等来调控N_(2)O的排放通量,且共同解释其变化98.7%。可持续农业管理策略影响土壤团聚体稳定性,进而直接调控土壤N_(2)O排放通量。
The investigation of the relationship between soil nitrous oxide(N_(2)O)emission and environmental fac?tors,as well as its response to management practices,is of great significance for estimating soil greenhouse gas emission potential,improving non?point source pollution,and optimizing citrus orchard management in the Three Gorges Reservoir Area of the Yangtze River.We explored the effects of management practices on the physicochemi?cal properties of citrus orchard soils,N_(2)O emission fluxes,and microbial characteristics,along with the regulatory mechanisms behind N_(2)O emissions in the Three Gorges Reservoir Area.Soil samples from 0-10 cm depth were col?lected under three management practices:fertilization plus smooth vetch cover(V),fertilization plus grass clearing(T),and no fertilization plus smooth vetch cover(NF).The results showed that fertilization increased overall soil enzyme activity by 5.12%and reduced the water stability of soil aggregates by 14.84%.In contrast,the smooth vetch cover reduced overall soil enzyme activity by 10.31%but did not affect aggregate stability.Fertilization stimu?lated soil N_(2)O emission,whereas smooth vetch reduced it.There was a weak correlation between soil N_(2)O and other gas emission fluxes.Greenhouse gas and ammonia emission fluxes were influenced by the ratio of soil carbon to ni?trogen and nitrate nitrogen content under T and NF treatments,and by soil pH and water content under V treatment.N_(2)O emission fluxes were significantly affected by soil total porosity,cation exchange capacity,and the threshold ratio of carbon to phosphorus.Soil microbial growth and metabolism were nitrogen?limited.Both fertilization and smooth vetch cover alleviated nitrogen?limitation.Furthermore,these practices regulated N_(2)O emission fluxes mainly through the direct effects of soil temperature on soil silt content,mean weight diameter of water?stable aggregates,and nitrate reductase activity,which collectively explained 98.7%of the variation.Implementing sustainable agri?cultural management strategies can enhance soil aggregate stability,thereby directly regulating soil N_(2)O emission fluxes.