文献类型：期刊文献

英文题名：Conservation farming practices in winter wheat-summer maize cropping reduce GHG emissions and maintain high yields

作者：Tan, Yuechen[1,2] Wu, Di[1,3] Bol, Roland[4] Wu, Wenliang[1] Meng, Fanqiao[1]

第一作者：谭月臣;Tan, Yuechen

通信作者：Meng, FQ[1]

机构：[1]China Agr Univ, Coll Resources & Environm Sci, Beijing Key Lab Biodivers & Organ Farming, Beijing Key Lab Farmland Soil Pollut Prevent & Re, Beijing, Peoples R China;[2]Chinese Acad Forestry, Inst Wetland Res, Beijing Key Lab Wetland Serv & Restorat, Beijing, Peoples R China;[3]Bangor Univ, Sch Nat Sci, Bangor LL57 2UW, Gwynedd, Wales;[4]Forschungszentrum Julich, Agrosphere IBG 3, Inst Bio & Geosci, D-52425 Julich, Germany

年份：2019

卷号：272

起止页码：266-275

外文期刊名：AGRICULTURE ECOSYSTEMS & ENVIRONMENT

收录：;Scopus(收录号：2-s2.0-85058091951);WOS:【SCI-EXPANDED(收录号:WOS:000468247700028)】；

基金：We thank Shuxian Chen, Rongchao Liu and Fengmei Geng for their work in managing the plots. This study was financially supported by the National Key Research and Development Program (No. 2016YFD0201204, 2017YFD0800605) and the Non-profit Research Foundation for Agriculture (201103039). We also thank Elaine Monaghan BSc (Econ), from Liwen Bianji, Edanz Editing China (www.liwenbianji.en/ac), for editing the English text of a draft of this manuscript.

语种：英文

外文关键词：Northern China Plain; Intensification; Straw incorporation; N2O; Net ecosystem economic budget

摘要：No-till (NT), straw incorporation (SI) and optimized N fertilization are important mitigation options for reducing greenhouse gas (GHG) emissions from agroecosystems. These measures may also help to maintain high crop production and are frequently recommended for use in northern China. Few studies, however, have addressed the interactive effects of these conservation and fertilization practices with respect to GHG emissions and crop yields. We report on a field experiment conducted in two consecutive dry years (2013-2015) when precipitation was much lower than the long-term average. We examined the effects of three different N fertilizer application rates, tillage practice and straw management on crop yields, GHG, area-scaled GHG (in global warming potential) and net ecosystem economic budget (NEEB) of a winter wheat-summer maize rotation system in northern China. Results showed that reducing N fertilizer significantly decreased soil N2O emissions without affecting annual crop yields. Compared with the average of all other fertilization treatments, the no-till x straw incorporation (NT x SI) practice increased both wheat and maize yields. However, in the maize season, NT also increased cumulative N2O emissions compared with conventional tillage (CT). The practices of combining N fertilization with straw management conferred an additional effect on 1920 emissions when compared with single practices (i.e, fertilization or straw management). Compared with straw removal (SR) treatments, SI increased annual cumulative N2O emissions by 37% for the conventional N fertilization, but decreased them by 13% at the optimized N fertilization. Neither single practice nor integrated practices had a significant effect on cumulative CH4 uptake. The highest NEEB values were obtained in NT x SI x optimal N fertilization (OPT) and NT x SR x OPT in the 1st and 2nd cropping years, respectively. We conclude that, when considering the additional benefits of SI for improving soil fertility and C sequestration, the NT x SI x OPT practice would be a viable strategy to achieve high crop yields, while simultaneously reducing GHG emissions.