Earthworm contributions to soil nitrogen supply in corn-soybean agroecosystems in Quebec, Canada

作     者：Zhor ABAIL Joann KWHALEN Zhor ABAIL;Joann K.WHALEN

作者机构：National Institute of Agricultural Research(INRA)Kenitra B.P.257Morocco Department of Natural Resource SciencesMacdonald Campus of McGill UniversitySte-Anne-de-BellevueQuebec H9X 3V9Canada 

出 版 物：《Pedosphere》 (土壤圈（英文版）)

年 卷 期：2021年第31卷第3期

页      面：405-412页

核心收录：

学科分类：07[理学] 0818[工学-地质资源与地质工程] 0903[农学-农业资源与环境] 0901[农学-作物学] 0713[理学-生态学] 

基　　金：Financial support for this study was provided by the Natural Sciences and Engineering Research Council of Canada(NSERC)through the Discovery Grant(No.RGPIN-2017-05391) 

主　　题：nitrogen excretionnitrogen fluxnitrogen releasesecondary productionsize frequency method 

摘      要：Accurately quantifying the soil nitrogen(N)supply in crop fields is essential for enabling environmentally sustainable and economically profitable crop *** requires using field-based methods to account for the contribution of soil biota,including earthworms,to N mineralization in temperate *** direct contribution of earthworms to the soil N cycle is the N they release throughout their life and after death,and it can be estimated using the secondary production *** study was conducted in 2014 and 2015 in two adjacent fields with annual corn-soybean rotation in Ste-Anne-de-Bellevue,Quebec,*** cumulative biomass of Aporrectodea *** two no-till corn-soybean agroecosystems was determined,and the direct N flux from these earthworms was estimated during the corn and soybean phases of the *** production was estimated by sampling earthworms biweekly during April-June and September-November and inferring the change in earthworm biomass between sampling dates using a size frequency *** N flux was calculated as the sum of the N released through excretion,during periods when earthworms were active,and from *** secondary production of the Aporrectodea population was estimated to be 8-43 g ash-free dry weight m^(-2) year^(-1),and the N flux was 22-105 kg N ha^(-1 )year^(-1).The N flux was higher at the early vegetative growth stage,which is a period of high N demand for *** findings suggest that refining the N fertilization recommendation by accounting for soil N supplied by earthworms could potentially reduce fertilizer costs and environmental N losses.