土壤与作物2024，Vol.13Issue(2)：154-164,11.DOI:10.11689/sc.2023121302
增温和秸秆还田对黑土农田土壤氮素有效性和N2O通量的影响
Effects of warming and straw returning on soil nitrogen availability and nitrous oxide flux in a Mollisol cropland
摘要
Abstract
Soil nitrogen(N)transformation processes determine the capacity of soil N supply to plant.The soil N transformation rates are affected by temperature and substrate availability.However,we are still far from understanding how soil N availability and nitrous oxide(N2O)flux respond to warming and straw returning.We conducted a field experiment in a Mollisol cropland in North-east China.We measured soil N availability and N2O flux in the 0-20 cm soil layer by using ion exchange resin membrane(IERM)in situ and static chamber-gas chromatography.Our results show that neither warming nor straw returning has significant effect on soil N availability,but the sampling time has a significant effect on soil N availability.Straw returning significantly increases N2O flux;in July,warming and straw returning has a significant interaction on N2O flux.Under the un-warming condition,straw returning significantly increases N2O flux by 109%;but under the warming condition,straw returning reduces N2O flux by 2%.Warming,straw returning,and sampling time has significant interactive effects on N2O flux.Overall,this study helps to evaluate the effect of straw returning on soil N transformation under global warming in cropland ecosystems,which is essential to future research on N cycling in Mollisols.关键词
黑土/全球变暖/氮素有效性/N2O通量/大豆秸秆Key words
Mollisols/global warming/nitrogen availability/nitrous oxide flux/soybean straw分类
农业科技引用本文复制引用
韩林,何朋,张志明,杨雪辰,李禄军..增温和秸秆还田对黑土农田土壤氮素有效性和N2O通量的影响[J].土壤与作物,2024,13(2):154-164,11.基金项目
国家重点研发计划项目(2022YFD1500305) （2022YFD1500305）
中国科学院东北地理与农业生态研究所青年科学家小组项目(2023QNXZ04) （2023QNXZ04）
国家自然科学基金项目(32101396,42277350,U23A6001) （32101396,42277350,U23A6001）
黑龙江省自然科学基金杰出青年项目(JQ2021C004). （JQ2021C004）
