Soil pH Dynamics and Nitrogen Transformations Under Long-Term Chemical Fertilization in Four Typical Chinese Croplands

查看全文 作　　者：MENG Hong-[1,2,3]qi;XU Ming-[2]gang;L Jia-[1]long;HE Xin-[4]hua;LI Jian-[5]wei;SHI Xiao-[6]jun;PENG [7]Chang;WANG Bo-[2]ren;ZHANG Hui-[2]min

机构地区：[1]College of Natural Resources and Environment,Northwest A&F University;[2]Key Laboratory of Crop Nutrition and Fertilization,Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning,Chinese Academy of Agricultural Sciences;[3]Institute of Resources and Environment,Henan Polytechnic University;[4]School of Plant Biology,The University of Western Australia;[5]Department of Botany and Microbiology,The University of Oklahoma;[6]College of Resources and Environment,Southwest University;[7]Institute of Soil and Fertilizer, Jilin Academy of Agricultural Sciences

出　　处：《Journal of Integrative Agriculture》索引2013年第12卷第11期,共11页

基　　金：provided by the National 973 Program of China(2011CB100501 and 2014CB441001);the National Natural Science Foundation of China(41071200) 摘　　要：Long-term fertilization experiment provides the platform for understanding the proton budgets in nitrogen transformations of agricultural ecosystems.We analyzed the historical(1990-2005) observations on four agricultural long-term experiments in China(Changping,Chongqing,Gongzhuling and Qiyang) under four different fertilizations,i.e.,no-fertilizer(control),sole chemical nitrogen fertilizer(F N),sole chemical phosphorous and potassium fertilizers(F PK) and chemical nitrogen,phosphorous and potassium fertilizers(F NPK).The significant decline in topsoil pH was caused not only by chemical N fertilization(0.29 and 0.89 pH at Gongzhuling and Qiyang,respectively) but also by chemical PK fertilization(0.59 pH at Gongzhuling).The enhancement of available nutrients in the topsoil due to long-term direct nutrients supply with chemical fertilizers was in the descending order of available P(168-599%)>available K(16-189%)>available N(9-33%).The relative rate of soil pH decline was lower under long-term judicious chemical fertilization(-0.036-0.034 pH yr-1) than that under long-term sole N or PK fertilization(0.016-0.086 pH yr-1).Long-term judicious chemical fertilization with N,P and K elements decreases the nutritional limitation to normal crop growth,under which more N output was distributed in biomass removal rather than the loss via nitrate leaching.We concluded that the N distribution percentage of nitrate leaching to biomass removal might be a suitable indicator to the sensitivity of agricultural ecosystems to acid inputs. 关键词：土壤PH值钾化肥长期施用氮素中国农业生态系统长期施肥试验土壤速效养分

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Soil pH Dynamics and Nitrogen Transformations Under Long-Term Chemical Fertilization in Four Typical Chinese Croplands

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