[The effects of nutrients in lake sediment on the eutrophication of lakes--features in the distribution of nutrients in the sediment of Lake Suwa and their behavior].
[The effects of nutrients in lake sediment on the eutrophication of lakes--features in the distribution of nutrients in the sediment of Lake Suwa and their behavior].
复制标题
湖泊沉积物营养盐对湖泊富营养化的影响——诹访湖沉积物营养盐分布特征及其行为[J].
DOI：
10.1265/jjh.40.892
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
Y. Kono
中科院分区：
文献类型：
--
作者：
Y. Kono
1978年5月至1983年3月，对日本琵琶湖沉积物中营养盐的水平和垂直分布特征进行了研究。通过室内实验，揭示了湖泊沉积物中营养盐的行为。结果表明：除河口区和鲤鱼养殖区外，全磷和全氮在整个湖泊表层沉积物中的水平分布基本一致。它们的组成值由在湖中心的表层沉积物中进行的测量表示。湖心表层沉积物中总磷和总氮含量为3.7-4.0mgP/g干重。和5.0-5.5mgN/g干重，1972 ~ 1978年期间，土壤全磷含量迅速增加。这被认为是由于流入湖泊的磷负荷增加及其自身积累的性质造成的。因此，湖泊沉积物中的磷含量预计将继续增加，与流入湖泊的磷负荷成比例。然而，在氮含量下没有发现这种性质。表层沉积物中无机磷含量与总磷含量具有很好的相关性，无机磷含量占总磷的60%~ 80%。无机磷中的Fe-P主要集中在沉积物的上层（0- 8 cm）。经过十周的实验室实验后，0-2cm层中的Fe-P呈减少趋势，因为其中一些明显溶解到上层水层中。而在2-6cm土层中，Fe-P含量增加。结果表明，沉积物中Fe-P的含量随沉积物温度的升高而升高，沉积物中铵态氮的含量随沉积物温度的升高而升高。氨氮生成速率与沉积物温度的关系式为GNH_4-N=0.018exp0.153T+0.427
During the period from May 1978 to March 1983, research was conducted on the features of horizontal and vertical distribution of nutrients contained in the sediment of Lake Suwa. Laboratory experiments were also conducted to reveal the behavior of the nutrients in the lake sediment. The following are the findings:Total phosphorus and nitrogen contents were found to be horizontally distributed in the surface sediment almost uniformly throughout the lake except for the estuary and carp-cultivating areas. Their constituent values are represented by the measurements taken in the surface sediment at the center of the lake. The values of total phosphorus and nitrogen contained in the surface sediment at the center of the lake were 3.7-4.0mgP/g dry wt. and 5.0-5.5mgN/g dry wt., respectively.Total phosphorus contents had rapidly increased during the period from 1972 to 1978. This is considered to have been caused by an increase in the phosphorus load flowing into the lake and its property to accumulate itself. Therefore, the amount of phosphorus contained in the lake sediment is expected to keep increasing in the future in proportion to the load of phosphorus flowing into the lake. However, such property has not been found with the nitrogen contents. It is therefore considered that nitrogen will maintain the current concentration level in the future.A high correlation was observed between the total phosphorus and the inorganic phosphorus in the surface sediment; 60%-80% of the total phosphorus was found to be inorganic phosphorus. Fe-P contained in the inorganic phosphorus was found to be highly concentrated in the upper layer (0-8cm) of the sediment. Fe-P showed a tendency to decrease in the 0-2cm layer after ten weeks of laboratory experiments as some of it had apparently dissolved out into the upper water layer. However, the amount of Fe-P increased in the 2-6cm layer. From these observations, it became clear that Fe-P had moved up from the lower layer of the sediment to the upper.A close correlation was found between the density of ammonium in the sediment and the temperature of the sediment. The relationship between the speed at which ammonium is generated and the temperature of the sediment is shown by the following formula:GNH4-N=0.018exp0.153T+0.427