中国生态农业学报（中英文）2024，Vol.32Issue(7)：1206-1217,12.DOI:10.12357/cjea.20230654
降雨、施肥对补水河流周边土壤硝态氮迁移分布的影响
Effects of rainfall and fertilization on soil nitrate nitrogen migration-distribu-tion around water replenishing rivers
摘要
Abstract
Soil nitrate-nitrogen migration around recharge rivers is affected by multiple factors,such as the hydrological condition of the rivers,rainfall,and fertilization.The study of soil nitrate-nitrogen distribution and leaching characteristics under the joint action of multiple factors can lay the foundation for an in-depth understanding of the soil nitrogen cycling process.In this study,we used farm-lands and agroforestry composite region(AF)around the Baiyangdian River on the North China Plain as the research focus.The farmland area was set up with three fertilization treatments—no fertilization(CK),optimized fertilization(YH),and conventional fertilization(XG).The distribution of nitrate-nitrogen along soil profile and leaching characteristics under different types of rainfall and ecological recharge,and other factors were comprehensively analyzed.The results showed that nitrogen application,rainfall type,and ecological water recharge were the key factors influencing nitrate-nitrogen migration around the recharged river.The amount of applied nitrogen determined the total amount of leached soil nitrate-nitrogen(P＜0.01).With the increase in nitrogen application,the nitrate-nitrogen content and nitrate-nitrogen leaching within the soil profile increased significantly.The total nitrate-nitrogen loss of YH treatment decreased by 40.6％compared with XG treatment,and the total nitrate-nitrogen leaching loss in the AF treatment de-creased by 40.1％.Rainfall and ecological recharge altered the migration of nitrate-nitrogen in the soil profile.Rainfall mainly af-fected the migration of nitrate-nitrogen from the surface to the middle and lower soil layers,and ecological recharge mainly affected the migration of nitrate-nitrogen from the middle and lower layers of the soil to the lower layers.In addition,the effects of different rainfall types on the migration of soil nitrate-nitrogen varied.The migration rate and amount of nitrate-nitrogen in the lower layer of the soil differed between two rainfall intensities.The peak of nitrate-nitrogen accumulation was in the 40-60 cm soil layer during both regular and heavy rainfall.Regular rainfall(3 d cumulative rainfall of 65.2 mm)resulted in an increase of 12.4 kg·hm-2(9.7％)in ni-trate-nitrogen storage in the 40-60 cm soil layer with XG treatment(compared with the 0-40 cm layer),while heavy rainfall(5 h cu-mulative rainfall of 49.2 mm)resulted in an increase of 16.3 kg·hm-2(16.7％)in nitrate-nitrogen storage in the 40-60 cm soil layer with XG treatment.Ecological recharge resulted in a reduction of nitrate-nitrogen storage by 42.7 kg·hm-2 and 39.6 kg·hm-2 in the 100-140 cm soil layer with the YH and XG treatments,respectively.These findings have important implications for managing soil ni-trogen pollution in the context of ecological recharge and extreme rainfall.关键词
施氮量/常规降雨/强降雨/生态补水/硝态氮迁移Key words
Nitrogen application rate/Regular rainfall/Heavy rainfall/Ecological recharge/Nitrate-N transport分类
农业科技引用本文复制引用
许晓媛,李彤阳,尹高飞,杨壹泽,焦会青,文宏达,王田甜,习斌,李文超..降雨、施肥对补水河流周边土壤硝态氮迁移分布的影响[J].中国生态农业学报（中英文）,2024,32(7):1206-1217,12.基金项目
国家自然科学基金项目(42107410)、河北省引进留学人员资助项目(C20200330,C20230337)、河北省教育厅科学技术研究项目(BJ2021026)和华北作物改良与调控国家重点实验室自主课题(NCCIR2021ZZ-20)资助 This study was supported by the National Natural Science Foundation of China(42107410),the Hebei Financial Aid Program for Introduced Over-seas Scholars(C20200330,C20230337),the Science and Technology Project of Hebei Education Department(BJ2021026),the Autonomous Subject of State Key Laboratory of North China Crop Improvement and Regulation(NCCIR2021ZZ-20). （42107410）
