Chemistry and Environment Science College of Inner Mongolia Normal University, Huhhot, 010022, China.
Environ Sci Pollut Res Int. 2019 Sep;26(27):28202-28209. doi: 10.1007/s11356-019-06026-9. Epub 2019 Jul 30.
In order to further explore the relationship between water body eutrophication of some reaches of Yellow River and phosphorus species in sediments, and evaluate phosphorus release potential from sediments to overlying water, we investigated the distribution of P species and their release risk in the surface sediments from different reaches along Yellow River, as well as the influence of artificial dam on phosphorus cycle in Yellow River. The results show that the content of calcium phosphorus (P) is higher than the content of bioavailable phosphorus (BP) (BP = P + P; in the formula, P means exchangeable phosphorus and P means iron phosphorus) in the surface sediments from Yellow River. Among all the surface sediment samples from 21 stations, only Dayudu section (H) has a ratio of W (BP)/W (P) higher than 0.5; the results show that the intensity of phosphorus release from H is high, and there is a potential risk of eutrophication in water, while the phosphorus release level of water sediment in other reaches of Yellow River is low. The content of BP and total phosphorus (∑P) in surface sediments along the Yellow River is in descending order: middle reaches of Yellow River > upper reaches of Yellow River > Yellow River downstream, while the content order of total phosphorus (TP) in the overlying water is as follows: Yellow river downstream > middle reaches of Yellow River > upper reaches of Yellow River (except the H station), indicating that extensive artificial corresponding damming in Yellow River basin makes the concentration of TP increasing significantly in overlying from upstream to downstream. The establishment of Haibowan water conservancy project in Yellow River makes the total particulate matter (TPM) concentration in the water to reduce to very low lever in Wuhai H section, and the phosphorus concentration in the overlying water reaches 0.136 mg L.
为了进一步探讨黄河某些河段水体富营养化与沉积物中磷形态的关系，评估沉积物向水体释放磷的潜力，我们调查了黄河不同河段表层沉积物中磷形态的分布及其释放风险，以及人工坝对黄河磷循环的影响。结果表明，黄河表层沉积物中钙磷（P）的含量高于生物可利用磷（BP）（BP=P+P；式中，P 表示可交换磷，P 表示铁磷）的含量。在 21 个站位的所有表层沉积物样品中，只有大榆树段（H）的 W（BP）/W（P）比值高于 0.5；这表明 H 段的磷释放强度较高，存在水体富营养化的潜在风险，而黄河其他河段的水-沉积物磷释放水平较低。黄河表层沉积物中 BP 和总磷（∑P）的含量顺序为：黄河中游>黄河上游>黄河下游，而黄河表层水总磷（TP）的含量顺序为：黄河下游>黄河中游>黄河上游（H 站除外），表明黄河流域广泛的人工相应筑坝使得从上游到下游，TP 在表层水中的浓度显著增加。黄河海勃湾水利枢纽工程的建立使得乌海西 H 段水体中的总颗粒物（TPM）浓度降低到非常低的水平，而表层水中的磷浓度达到 0.136mg/L。
