Irrigation system and land use effect on surface water quality in river, at Lake Dianchi, Yunnan, China.
Irrigation system and land use effect on surface water quality in river, at Lake Dianchi, Yunnan, China.
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DOI：
10.1016/s1001-0742(12)60206-x
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发表时间：
2013-06
影响因子：
6.9
通讯作者：
Takashi Tanaka;Takahiro Sato;Kazuo Watanabe;Y. Wang;Dan Yang;H. Inoue;Kunzhi Li;T. Inamura
中科院分区：
文献类型：
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作者：
Takashi Tanaka;Takahiro Sato;Kazuo Watanabe;Y. Wang;Dan Yang;H. Inoue;Kunzhi Li;T. Inamura
地表水样本采集于流入中国云南省严重富营养化湖滇池的大河及其支流，以阐明控制水质波动的因素。观测水质趋势的时空分布。各河流的水质取决于水闸、循环灌溉系统等水文效应。准确认识本研究区河流水质变化必须考虑水文效应。在没有高循环灌溉系统或水闸效应的河流中，以露地耕作为主的地区下游硝态氮（NO3-N）浓度增加，而以温室土地利用为主的地区NO3-N浓度保持不变或下降。这一结果表明，温室覆盖了来自降水的土壤，并且在降雨过程中，温室的硝酸盐负荷可能低于露地栽培。在以露地耕作为主的河流上游，溶解钼酸盐活性磷和总磷浓度没有急剧增加，但在以温室土地利用为主的河流下游，P负荷有所积累。尽管本研究中磷的来源尚不清楚，但由于温室土壤中磷含量较高，温室地区可能具有磷负荷的潜力。需要考虑水文效应来确定影响水质变化的主要因素，特别是在本研究点灌溉系统高度复杂的地区。
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.