|Table of Contents|

Impact of Land Use Structure on River Water Quality During Dry Season in Dali River Basin of Shaanxi, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2022年第02期
Page:
327-337
Research Field:
水资源与水文地质
Publishing date:

Info

Title:
Impact of Land Use Structure on River Water Quality During Dry Season in Dali River Basin of Shaanxi, China
Author(s):
LIU Ran1; 2;  XU Guo-ce1; 2*;  LI Zhan-bin1; 2;  WANG Bin1; 2;  XU Huai-yu3
(1.State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an 710048, Shaanxi, China; 2. School of Water Resources and Hydropower, Xi'an University of Technology, Xi'an 710048, Shaanxi, China; 3. Northwest Engineering Corporation Limited, PowerChina, Xi'an 710065, Shaanxi, China)
Keywords:
water quality;  land use;  stepwise multiple regression;  Nemerow pollution index;  dry season;  buffer zone;  spatial characteristic;  Yellow River basin
PACS:
P64; X522
DOI:
10.19814/j.jese.2021.07004
Abstract:
Land use change has a significant impact on natural and ecological processes, and it is also one of the main influencing factors of runoff water quality. Based on the runoff sampling and measurement of 21 sample sections in Dali river basin of Shaanxi during dry season in 2020, the characteristics of TN(total nitrogen), TP(total phosphorus), NH3-N(ammonia nitrogen)concentration and DO(dissolved oxygen)concentration in Dali river basin were analyzed; Nemerow pollution index method was used to evaluate the water quality in Dali river basin, and the impact of land use structure on water quality in the buffer zone at different scales was identified. The results show that TN exceedes the standard the most serious among the four water quality parameters. The average value of Nemerow pollution index in the basin is 1.9, and the water body is slightly polluted; the average values of Nemerow pollution index are 2.3 in the main stream and 1.2 in the tributaries, the water quality of the tributaries is better than that of the main stream. The impact of cultivated land within 200 m on TN is greater than that within 100 m in the point buffer zone; the impact of grassland within 100 m on TP and the impact of cultivated land on NH3-N is greater than that within 200 m in the river network buffer zone. Grassland is the main land use type that intercepts pollutants within 100 m; forest land is the main land use type that intercepts pollutants within 200 m. Cultivated land and building site land play a “source” role for TN, TP, and NH3-N concentration in the point buffer zone and river network buffer zone; the “sink” function of forest land is more prominent at the point buffer zone, and the “sink” function of grassland is more prominent at the river network buffer zone.

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Last Update: 2022-04-30