长江水体溶解态无机氮和磷现状及长期变化特点
ANALYSIS OF DISTRIBUTION, FLUX AND LONG-TERM VARIATIONS OF DISSOLVED INORGANIC NITROGEN AND PHOSPHATE IN THE CHANGJIANG RIVER
查看参考文献36篇
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文摘
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于2006年2、5、8和11月对长江从攀枝花至河口和上游的两条支流雅砻江和嘉陵江的溶解态无机氮(NO_3~--N、NO_2~--N和NH_4~+-N)和磷酸盐(PO_4~(3-)-P)进行了取样调查,同时结合长江营养盐的历史数据,分析了长江水体中溶解态无机氮、磷的长期变化特点。结果表明,长江NO_3~--N、NH_4~+-N、DIN(包括NO_3~--N、NO_2~--N和NH_4~+-N)和PO_4~(-3)-P浓度从上游到下游显示出增加趋势,但存在季节差异;NO_2~--N浓度总体较低,在长江中下游(武汉-南京)浓度较高。长江从上游到下游DIN通量的变化主要受径流量的影响,从上游到下游单位面积年产N量逐渐升高;PO_4~(3-)-P输送通量从上游往下游呈增加趋势,也主要受径流量控制,但从季节变化来讲,PO_4~(3-)-P的月输送通量受其浓度的控制更加明显。自20世纪60年代来,长江水体中NO_3~--N、NO_2~--N、DIN和PO_4~(3-)-P的浓度都处于缓慢上升趋势,但到80年代上升速度明显加快;不同阶段DIN和PO_4~(3-)-P的季节变化特点也不尽相同,反映了其来源的差异。目前,长江水体中溶解态无机氮、磷浓度与国内及国际河流相比处于中等水平。 |
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其他语种文摘
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The concentrations of dissolved inorganic nitrogen (NO_3~--N, NO_2~--N and NH_4~+-N) and dissolved inorganic phosphate (PO_4~(3-)-P) were investigated from Panzhihua to Shanhai in the Changjiang River and two tributaries of the upper drainage (Yalongjiang River and Jialingjiang River) during February, May, August and November in 2006. The results showed that NO_3~--N, NH_4~+-N, DIN or PO_4~(3-)-P concentration increased from upstream to downstream while there were seasonal differences. The concentration of NO_2~--N was relatively low and it was higher in the middle and lower reaches from Wuhan to Nanjing. DIN flux in the Changjiang River was mainly controlled by water discharge, however monthly PO_4~(3-)-P flux was greatly influenced by the riverine concentration of PO_4~(3-)-P when the seasonal variations were considered. The areal yields of DIN and PO_4~(3-)-P increased obviously from upstream to downstream. The concentrations of NO_3~- -N, NO_2~--N, DIN and PO_4~(3-)-P increased steadily since 1960s and rose greatly after 1980. The seasonal variations of DIN and PO_4~(3-)-P were quite different, which suggested that they might be from different sources. Compared with other large rivers in the world, the concentrations of DIN and PO_4~(3-) -P were higher than those of the large and less disturbed world systems and lower than those of the eutrophic rivers in Europe and North America. |
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来源
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海洋与湖沼
,2012,43(6):1067-1075 【核心库】
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关键词
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氮
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磷
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输送通量
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长江
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地址
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中国科学院海洋研究所, 中国科学院生态与环境重点实验室, 青岛, 266071
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语种
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中文 |
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ISSN
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0029-814X |
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学科
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普通生物学 |
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基金
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国家自然科学基金
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国家973计划
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中国科学院知识创新工程重要方向项目
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国家863计划
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文献收藏号
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CSCD:4759074
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