首页|Responses of Nutrients to the Precipitation Variation and Land Use in Subtropical Monsoonal Small Mountainous Rivers:A Case Study of Baixi Watershed

Responses of Nutrients to the Precipitation Variation and Land Use in Subtropical Monsoonal Small Mountainous Rivers:A Case Study of Baixi Watershed

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Small mountainous rivers are characterized by large instantaneous fluxes and susceptible to extreme weather events,which can rapidly transport materials into the sea and have a significant impact on the ecological environment of estuaries and bays.In order to investigate the seasonal characteristics of nutrients in small mountainous rivers in the subtropical monsoon region and the output pattern to the sea during heavy precipitation,surveys on the mountainous rivers were carried out in Baixi watershed in August 2020(wet season),March 2021(dry season)and June 2021(Meiyu period).The results showed that the dissolved inorganic nitrogen(DIN)of the rivers has an average concentration of 752 µg L-1 in the wet season and 1472 μg L-1 in the dry season.The concentrations of dis-solved inorganic phosphorus(DIP)in wet season and dry season were 63 μgL-1 and 51 μgL-1,respectively.Influenced by the changes of land use in sub-watersheds,DIN concentrations in the mainstream increased from 701 μgL-1 in the upper reaches to 1284μgL-1 in the middle reaches.Two rainstorms during the Meiyu period in the watershed caused the pulse runoff in the river.The maximum daily runoff reached 70 times that before rains.The maximum daily fluxes of DIN and DIP were 109 and 247 times that before rains,respec-tively.In view that the watershed experienced several rainstorms in the wet season,the river,with pulse runoff,carries a large amount of nutrients into the sea in a short time,which will have a significant impact on the environment of Sanmen bay and its adjacent sea.

small mountainous riveruneven precipitationrainstormpulse runoffnitrogen and phosphorus

TIAN Yuan、GAO Fei、CAO Ke、LV Shenghua、DUAN Xiaoyong、YIN Ping

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Qingdao Institute of Marine Geology,China Geological Survey,Ministry of Natural Resources,Qingdao 266237,China

Laboratory for Marine Geology,Laoshan Laboratory,Qingdao 266237,China

Postdoctoral Foundation of Qingdao(Pb Isotopes of Oujiang River to Quantitatively Identify Sediment Provenance in Oujiang EsChina Geological Survey ProjectFund of Ministry of Science and TechnologyFund of Ministry of Science and Technology

DD201902762013FY1122002019YFE0127200

2024

10.1007/s11802-024-5462-y

中国海洋大学学报(自然科学英文版)
中国海洋大学

中国海洋大学学报(自然科学英文版)

CSTPCD
影响因子：0.268
ISSN：1672-5182
年,卷(期)：2024.23(2)
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