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

Pedosphere 2021年第3期31卷 405-412页

作者： Zhor ABAIL Joann KWHALEN National Institute of Agricultural Research(INRA) Kenitra B.P.257Morocco Department of Natural Resource Sciences Macdonald Campus of McGill UniversitySte-Anne-de-BellevueQuebec H9X 3V9Canada

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.

关键词： nitrogen excretionnitrogen fluxnitrogen releasesecondary productionsize frequency method

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