Irrigation system and land use effect on surface water quality in river, at lake Dianchi, Yunnan, China |
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Authors: | Takashi Tanak Takahiro Sato Kazuo Watanabe Ying Wang Dan Yang Hiromo Inoue Kunzhi Li Tatsuya Inamura |
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Affiliation: | Graduate School of Agriculture, Kyoto University, Oiwake-cho, Sakyo, Kyoto 606-8502, Japan;Biotechnology Research Center, Kunming University of Science and Technology, 727 Jingming Road (South), Chenggong New District, Kunming 650500, China;Crop and Environmental Sciences Division, International Rice Research Institute, DAPO Box7777, Metro Manila, Philippines;Center for Southeast Asian Studies, Kyoto University, 46 Yoshidashimoadachi-cho, Sakyo, Kyoto 606-8501, Japan;Center for Southeast Asian Studies, Kyoto University, 46 Yoshidashimoadachi-cho, Sakyo, Kyoto 606-8501, Japan;Graduate School of Agriculture, Kyoto University, Oiwake-cho, Sakyo, Kyoto 606-8502, Japan;Biotechnology Research Center, Kunming University of Science and Technology, 727 Jingming Road (South), Chenggong New District, Kunming 650500, China;Graduate School of Agriculture, Kyoto University, Oiwake-cho, Sakyo, Kyoto 606-8502, Japan;Biotechnology Research Center, Kunming University of Science and Technology, 727 Jingming Road (South), Chenggong New District, Kunming 650500, China;Graduate School of Agriculture, Kyoto University, Oiwake-cho, Sakyo, Kyoto 606-8502, Japan |
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Abstract: | The surface water samples were collected in river Dahe and its tributaries, which flow into severely eutrophic lake Dianchi, Yunnan Province, China, in order to elucidate factors controlling water quality fluctuations. The temporal and spatial distribution of water quality tendency was observed. The water quality of each river is dependent on the hydrology effect such water gate and circulating irrigation system. We must consider the hydrology effect to accurately understand water quality variations of river in this study field. In river without highly circulating irrigation system or water gate effect, the downstream nitrate nitrogen (NO3-N) concentration increase occurred in area dominated by open field cultivation, whereas the NO3-N concentration was constant or decreased in area dominated by greenhouse land use. This result suggests that greenhouse covers the soil from precipitation, and nitrate load of greenhouse could be less than that of open field cultivation while the rainfall event. In the upper reaches of river, where is dominated by open field cultivation, there were no sharp increase dissolved molybdate reactive phosphorus and total phosphorus concentration, but P load was accumulated in the lower reaches of river, whose predominant land use is greenhouse. Although the P sources is unclear in this study, greenhouse area may have potential of P loads due to its high P content in greenhouse soil. Considering hydrology effect is necessary to determine what the major factor is influencing the water quality variation, especially in area with highly complicated irrigation system in this studying site. |
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Keywords: | lake Dianchi eutrophication surface water quality land use plastic greenhouse circulating irrigation |
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