大伙房水库主要外源性氮磷来源的研究

Study on the Sources of Main Extragenous Nitrogen and Phosphorus in Dahuofang Reservoir

大伙房水库每年要接纳的氮、磷量分别为１８７８．７５ｔ和６１．２３ｔ，其中无机氮１４２３．０７ｔ、溶解总磷４５．２７ｔ。水库输出的氮、磷量分别为８９８．０８ｔ和２６．４４ｔ。全年滞留于水库的氮为９８０．６７ｔ，磷为３４．７９ｔ。河流输入氮、磷量约占总输入量的９４．２％和９５．２％，是大伙房水库氮、磷最主要的来源。此外，河流还向水库输入外源性浮游物约１５１１１．３４ｔ可提供鱼产量约６３５ｔ。外源性浮游物对水库渔业具有一定意义。

The annual inputs of total nitrogen and phosphorus were 1878.5 t and 61.23t,respectively,in which the total inorganic nitrogen and dissolved phospho-rus were 1423.07 t and 47. 27 t.The annual outputs of the total nitrogen and phosphorus were 898.08 t and 26.44 t,and about 980.6 t nitrogen and 34.79 t phosphorus were accumulated in Dahuofang Reservoir through a year,The influx-es of three rivers were dominant nutrient resource, 94.2% nitrogen and 95.2% phosphorus inputs derived from these rivers,In addition to these,approximate 15111.34 t extragenous seston which would be turnovered 635 t potential fish pro-duction were also inputed by these rivers in a year.The extragenous seston was important to reservoir fisheries.