Influence of Agricultural Activity on Nitrogen Budget in Chinese and Japanese Watersheds

查看全文 作　　者：S. D. [1,2]KIMURA;YAN Xiao-[2]Yuan;R. [3]HATANO;A. [4]HAYAKAWA;K. [5]KOHYAMA;TI Chao-[2]Pu;DENG Mei-[1]Hua;M. [6]HOJITO;S. [5]ITAHASHI;K. [3]KURAMOCHI;CAI Zu-[2]Cong;M. [7]SAITO

机构地区：[1]Tokyo University of Agriculture and Technology, Tokyo (Japan);[2]Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008 (China);[3]Hokkaido University, Sapporo (Japan);[4]Akita Prefectural University, Akita (Japan);[5]National Institute for Agro-Environmental Sciences, Tsukuba (Japan);[6]Kitasato University, Towada (Japan);[7]Tohoku University, Osaki (Japan)

出　　处：《Pedosphere》索引2012年第22卷第2期,共15页

基　　金：Supported by the Strategic International Cooperative Program 'Comparative Study of Nitrogen Cycling and Its Impact on Water Quality in Agricultural Watersheds in Japan and China' by the Japan Science and Technology Agency and the National Natural Science Foundation of China(No.41071196) 摘　　要：To analyze the effect of agricultural activity on nitrogen(N) budget at the watershed scale,a comparative study was conducted at two Japanese watersheds,the Shibetsu River watershed(SRW) and Upper-Naka River watershed(UNRW),and one Chinese watershed,the Jurong Reservoir watershed(JRW).The total area and the proportion of agricultural area(in parentheses) of the watersheds were 685(51%),1 299(21%),and 46 km 2(55%) for SRW,UNRW,and JRW,respectively.The main agricultural land use in SRW was forage grassland,while paddy fields occupied the highest proportion of cropland in UNRW(11% of total area) and JRW(31% of total area).The farmland surplus N was 61,48,and 205 kg N ha 1 year 1 for SRW,UNRW,and JRW,respectively.The total input and output for the whole watershed were 89 and 76,83 and 61,and 353 and 176 kg N ha 1 year 1 for SRW,UNRW,and JRW,respectively.The proportion of discharged N to net anthropogenic N input was 31%,37%,and 1.7% for SRW,UNRW,and JRW,respectively.The two watersheds in Japan showed similar proportions of discharged N to those of previous reports,while the watershed in China(JRW) showed a totally different characteristic compared to previous studies.The high N input in JRW did not increase the amount of discharged N at the outlet of the watershed due to high proportions of paddy fields and water bodies,which was an underestimated N sink at the landscape scale. 关键词：农业活动小流域氮收支日本中国农业生产活动农业土地利用水库集水区

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Influence of Agricultural Activity on Nitrogen Budget in Chinese and Japanese Watersheds

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