Soil mineral nitrogen dynamics in fallow periods in a rainfed semiarid Mediterranean agricultural system

作     者：Awais SHAKOOR Àngela D.BOSCH-SERRA Antonio LIDON Damián GINESTAR Jaime BOIXADERA Awais SHAKOOR;àngela D.BOSCH-SERRA;Antonio LIDON;Damián GINESTAR;Jaime BOIXADERA

作者机构：University of LleidaDepartment of Environment and Soil SciencesAvda.Alcalde Rovira Roure 191Lleida E-25198(Spain) Institute of Water and Environmental EngineeringUniversitat Politècnica de ValènciaCamino de Vera s/n.Valencia E-46022(Spain) Institute for Multidisciplinary MathematicsUniversitat Politècnica de ValènciaCamino de Vera s/n.Valencia E-46022(Spain) Department of AgricultureLivestockFisheries and FoodGovernment of CataloniaAvda.Alcalde Rovira Roure 191Lleida E-25198(Spain) 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2023年第33卷第4期

页      面：622-637页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 090301[农学-土壤学] 

基　　金：supported by Spanish Ministry of Economy and Competitiveness and Spanish National Institute for Agricultural Research and Experimentation(MINECOINIA)(No.RTA2017-88-C3-3) 

主　　题：crop rotation Latin Hypercube-One factor at a Time(LH-OAT)method Leaching Estimation and Chemistry Model(LEACHM) mineral fertilizer nitrogen balance nitrogen environmental impacts nitrogen leaching soil water 

摘      要：Rainfed agricultural systems in semiarid Mediterranean environments are subject to erratic but often heavy rainfall *** an agronomic practice,fallow periods can be included even within the existing European Union common policy for crop *** study aimed to quantify the effects of previous mineral fertilization on soil mineral nitrogen(N_(min))content and potential nitrate leaching during no-till fallow periods of crop *** Leaching Estimation and Chemistry Model(LEACHM)was used for soil N_(min)prediction after *** fallow periods,N_(min)measured in the soil profile increased by an average of 125 kg N ha^(-1),whereas the model showed an average increase of 95 kg N ha^(-1).The amount of nitrogen(N)leached was estimated to be 11–38 kg N ha^(-1).The N balance simulated using LEACHM might differ from the actual *** calibrated LEACHM underestimated soil N_(min)after a drought period followed by soil water replenishment,probably due to a pulse in soil C and N mineralization caused by the wetting of dry soil,but overestimated soil N_(min)after occasional rainy spells when soil quickly became saturated,probably due to occasional nitrous oxide emissions not being fully accounted for by the model and specific preferential water flow,which might lead to greater nitrate leaching than that simulated by LEACHM using the convection-dispersion *** results show that soil N_(min)measurements after fallow periods cannot be well predicted by *** findings of this study provide a support for fertilization planning for crop rotation systems including a fallow period to avoid overfertilization in the following cropping season and reduce N environmental impacts.