Contributions of Volume and Concentration on Runoff Nitrogen Losses from Intensive Vegetable in China  

作　　者：Mingkun Cheng Ju Min Yanying Zhang Yuhe Wang Xia Wang Weiming Shi 

机构地区：[1]Department of Horticulture,Foshan University,Foshan,528000,China [2]State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences(CAS),Nanjing,210008,China [3]College of Life Sciences,Anhui Normal University,Wuhu,241000,China [4]Quality Department,Jiangsu Environmental Monitoring Center,Nanjing,210036,China

出　　处：《Phyton-International Journal of Experimental Botany》2024年第9期2439-2453,共15页国际实验植物学杂志(英文)

基　　金：supported by the National Key Research and Development Program of China(No.2021YFD1700801).

摘　　要：Vegetable runoff nitrogen(N)loss is a serious environmental issue.However,whether the volume or N content of runoff determines the final N losses has not been clarified,which limited the optimal N managements in vegetable production.Here,we conducted a simulated rainfall experiment to study the runoff N loss flux pattern and the accumulation rate as well as the main influencing factors.The results showed that at 20 to 30 min,the volume of runoff water with a high N content reaches a critical inflection point of increase.Under 55 mm/h rainfall intensity,the N concentration decreased continuously.Under 75 mm/h,the soluble N concentration decreased during the first 25 min;thereafter,it stabilized.However,the total and particulate N decreased significantly after 30 min.Nitrogen losses via runoff from vegetable fields were from 18.5 to 26.0 kg/ha under two rainfall intensities.Runoff soluble N losses were mainly attributed to applied fertilizers(79.7%-95.5%),while particulate N losses were primarily originated from soil-retained N.Our data indicates that there was a significant difference in N losses pattern and influencing factors under varied fertilizer N inputs and rainfall intensities,which can help to optimize water and N fertilizer managements to mitigate non-point source N pollutants.In the future,long-term multi-site and-crop studies should be conducted to comprehensively clarify the N runoff losses in vegetable soils.

关 键 词：Non-point source pollution N fertilizer runoff rate Raphanus sativus L. 

分 类 号：S15[农业科学—土壤学]