黄河兰州段河岸带沉积物磷的形态分布及释放风险

doi:10.13866/j.azr.2024.12.06

Abstract

Abstract:

Phosphorus pollution is a significant concern in aquatic systems, as excessive accumulation can lead to eutrophication. The riparian zone, a vital transitional area between land and water, is crucial for mitigating phosphorous loss. Therefore, in this study, we investigated the forms and distribution characteristics of phosphorus in the sediments of the riparian zone along the Yellow River in Lanzhou using the SMT method and the Psenner classification extraction method. Additionally, we assessed the risk of phosphorus release using the balance concentration assessment method, single-factor analysis, and the bioavailable phosphorus pollution index. The results indicate that the average total phosphorus content in the sediments of the study area is relatively high, measuring 1240.07 mg∙kg^-1, with inorganic phosphorus as the dominant form, primarily calcium phosphorus. The phosphorus balance concentration in the sediments exceeds that of dissolved reactive phosphorus in the overlying water, indicating that the sediments act as a “phosphorus source” for the overlying water. Furthermore, evaluations of the single-factor pollution index and the bioavailable phosphorus pollution index reveal that while total phosphorus pollution in the area is primarily classified as heavy, the ecological pollution status of phosphorus in the Lanzhou section of the Yellow River is relatively good.

Key words: Northwest China, the Yellow River Basin, riparian zone, phosphorus forms, phosphorus release risk

WANG Ruofan, LIU Yuxin, LI Peigang, TANG Yue, XIE Wei. Phosphorous distribution patterns and release risks in the riparian zone sediments of the Lanzhou section of the Yellow River[J].Arid Zone Research, 2024, 41(12): 2035-2044.

Figures/Tables 10

Fig. 1

Fig. 2

Fig. 3

Tab. 1

Evaluation criterion of pollution index in sediments"

风险级别	$P T P$	污染程度
Ⅰ	$P T P 0.5$	清洁
Ⅱ	$0.5 ≤ P T P 1$	轻度污染
Ⅲ	$1 ≤ P T P 1.5$	中度污染
Ⅳ	$1.5 ≤ P T P$	重度污染

Tab. 1

Tab. 2

Fig. 4

Fig. 5

Fig. 6

Tab. 3

Tab. 4

Classification of risk level by the single factor pollution index(PTP) and bioavailable index(PKTP)"

样点编号	$P T P$		风险等级	$P K T P$		风险等级
样点编号	枯水期	丰水期	风险等级	枯水期	丰水期	风险等级
1#	1.87	2.02	重度污染	0.33	0.33	清洁
2#	1.90	2.07	重度污染	0.30	0.33	清洁
3#	2.02	2.10	重度污染	0.33	0.34	清洁
4#	2.17	2.32	重度污染	0.38	0.47	清洁
5#	2.15	2.16	重度污染	0.37	0.37	清洁
6#	2.06	2.21	重度污染	0.33	0.36	清洁
7#	1.95	2.08	重度污染	0.31	0.36	清洁
8#	1.96	2.03	重度污染	0.30	0.32	清洁

Tab. 4

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	TP/(mg·L^-1)	NH₃-N/(mg·L^-1)	COD_Mn/(mg·L^-1)	pH	溶解氧/(mg·L^-1)	温度/℃
夏季	0.04~0.05	0.12~0.36	1.21~2.23	7.48~8.44	8.52~9.67	9.9~14.6
冬季	0.02~0.04	0.12~0.27	1.32~1.85	7.32~8.12	9.14~11.26	1.0~5.5

样点编号	等温吸附方程		EPC₀/（mg∙L^-1）
样点编号	枯水期	丰水期	枯水期	丰水期
1#	Q=24.701C₀-4.3026	Q=21.552C₀-3.3226	0.17	0.15
2#	Q=27.817C₀-5.0574	Q=22.737C₀-6.5012	0.18	0.28
3#	Q=26.496C₀-7.8595	Q=21.653C₀-2.5250	0.31	0.12
4#	Q=29.460C₀-10.920	Q=22.742C₀-12.544	0.37	0.55
5#	Q=28.545C₀-8.1926	Q=23.140C₀-5.0191	0.29	0.22
6#	Q=30.729C₀-8.7721	Q=20.851C₀-2.4630	0.29	0.12
7#	Q=26.947C₀-5.9402	Q=18.588C₀-1.6916	0.22	0.09
8#	Q=26.377C₀-6.7415	Q=20.680C₀-2.0075	0.26	0.10

Phosphorous distribution patterns and release risks in the riparian zone sediments of the Lanzhou section of the Yellow River

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