| 中国和日本农业活动对流域氮素收支的影响 |
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| 作者姓名： | S. D. KIMURA YAN Xiao-Yuan R. HATANO A. HAYAKAWA K. KOHYAMA TI Chao-Pu DENG Mei-Hu M. HOJITO S. ITAHASHI K. KURAMOCHI CAI Zu-Cong M. SAITO |
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| 作者单位： | Tokyo University of Agriculture and Technology;Institute of Soil Science,Chinese Academy of Sciences;Hokkaido University;Akita Prefectural University;National Institute for Agro-Environmental Sciences;Kitasato University;Tohoku University |
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| 基金项目： | 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) |
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| 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.
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| 关 键 词： | anthropogenic nitrogen input denitrification discharged nitrogen land use nitrogen balance |
| 收稿时间： | 10 July 2011 |
Influence of agricultural activity on nitrogen budget in Chinese and Japanese watersheds |
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| S. D. KIMURA,YAN Xiao-Yuan,R. HATANO,A. HAYAKAWA,K. KOHYAMA,TI Chao-Pu,DENG Mei-Hu,M. HOJITO,S. ITAHASHI,K. KURAMOCHI,CAI Zu-Cong,M. SAITO.Influence of agricultural activity on nitrogen budget in Chinese and Japanese watersheds[J].Pedosphere,2012,22(2):137-151. |
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| Authors: | S D KIMURA YAN Xiao-Yuan R HATANO A HAYAKAWA K KOHYAMA TI Chao-Pu DENG Mei-Hu M HOJITO S ITAHASHI K KURAMOCHI CAI Zu-Cong and M SAITO |
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| Institution: | Tokyo University of Agriculture and Technology, Tokyo (Japan);Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008 (China);Hokkaido University, Sapporo (Japan);Akita Prefectural University, Akita (Japan);National Institute for Agro-Environmental Sciences, Tsukuba (Japan);Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008 (China);Tokyo University of Agriculture and Technology, Tokyo (Japan);National Institute of Livestock and Grassland Science, Nasushiohara (Japan);National Institute for Agro-Environmental Sciences, Tsukuba (Japan);Hokkaido University, Sapporo (Japan);Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008 (China);Tohoku University, Osaki (Japan) |
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| Abstract: | 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 km2 (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 land area) and JRW, (31% of total land 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 was 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 inputs 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. |
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| Keywords: | anthropogenic nitrogen input denitrification discharged nitrogen land use nitrogen balance |
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