Effect of in-stream impoundment on water quality of a suburban stream

被引：4

作者：

Shimizu, Yuta ^{[1
]}

Onodera, Shin-ichi ^{[2
]}

Jin, Guangzhe ^{[3
]}

Saito, Mitsuyo ^{[4
]}

机构：

[1] Natl Agr & Food Res Org, Western Reg Agr Res Ctr, 6-12-1 Nishi Fukatsu, Fukuyama, Hiroshima 7218514, Japan

[2] Hiroshima Univ, Grad Sch Adv Sci & Engn, 1-7-1 Kagamiyama, Hiroshima, Hiroshima 7398521, Japan

[3] Guangdong Ocean Univ, Coll Ocean & Meteorol, 1 Haida Rd, Zhanjiang 524088, Guangdong, Peoples R China

[4] Okayama Univ, Grad Sch Environm & Life Sci, Kita Ku, 3-1-1 Tsushima Naka, Okayama, Okayama 7008530, Japan

来源：

LIMNOLOGY | 2020年 / 21卷 / 03期

基金：

日本学术振兴会;

关键词：

Phosphorus; In-stream impoundment; Retention; Suburban watershed; DISSOLVED ORGANIC-MATTER; KARST TEST-SITE; LAKE-SEDIMENTS; PHOTOCHEMICAL RELEASE; PHOSPHORUS RELEASE; DIURNAL-VARIATIONS; TROPHIC STATE; LAND-USES; NITROGEN; NUTRIENTS;

D O I：

10.1007/s10201-020-00619-x

中图分类号：

Q [生物科学];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

This study aims to confirm the effect of a small stream impoundment on phosphorus and nitrogen dynamics in a suburban watershed. The results show that the phosphate concentration in the water body was significantly higher than that in the inflowing water under ordinary flow conditions. The phosphorus promotes algal growth that causes significant diurnal dissolved oxygen variation because of photosynthesis and respiration. The phosphate exchange between the sediment and overlying water was mainly controlled by diffusion flux rather than by advective flux seepage because of large amounts of phosphorus accumulated on the surface of the sediment. When a flood occurs, the phosphorus-enriched water is flushed downstream by rain-swollen currents. In summary, an impoundment affects in-stream phosphorus concentration through organic matter degradation and the release of phosphate in the sediment.

引用

页码：393 / 402

页数：10

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