期刊论文

中文

农业现代化研究

1000-0275

2022

43

4

738-746

10.13872/j.1000-0275.2022.0071

国家自然科学基金项目（U20A2011;41930652;41807517）； 广西科技计划项目（2018GXNSFBA281157）；

本校为其他机构

农田土壤N_2O排放是重要温室气体排放源,也是土壤氮素的重要损失途径。以往研究发现,耕作导致喀斯特地区土壤总氮快速损失,但翻耕扰动对N_2O排放的影响及其作用机制尚不清晰。本研究采用原位控制实验,设置不同频率翻耕处理:分别隔6个月(T1)、4个月(T2)、2个月(T3)、1个月(T4)翻耕一次,以免耕为对照,探讨不同翻耕频率下土壤N_2O排放规律及其影响因素。结果表明:相比免耕,较高频翻耕(T2、T3和T4)显著降低N_2O年累积排放量;N_2O排放量在夏季最高,冬季最低。各处理N_2O累积排放量随土壤温度升高呈指数增长,与土壤含水量呈二次方程关系。团聚体(>2 mm和0.25~2 mm)、总氮、NO_3~-及微生物生物量碳(Mic...

N2O emissions from agricultural soils are an important source of greenhouse gas emissions and an important loss of soil nitrogen.Previous studies have found that tillage leads to rapid loss of soil total nitrogen in Karst areas,but the effect of tillage disturbance on N2O emissions and its mechanism are still unclear.Based on anin-situ experiment with treatments of tillage at different frequencies:tilled every 6 (T1),4 (T2),2 (T3),1 (T4) month(s),and no-till treatment as control,this study investigated the law and impact factors of N2O emissions under tillage at different frequencies.Results s...