Study on the temporal and spatial scale effects of landscape pattern on river water quality in Shenzhen River-Bay Watershed

doi:10.14088/j.cnki.issn0439-8114.2023.01.009

Abstract

Abstract: The relationship between land use/landscape pattern and water quality at different spatial and temporal scales was explored to provide reference for rational planning of land resources, so as to protect the water quality safety of the watershed. Based on the data of river water quality and land use in Shenzhen River-Bay Watershed in 2020, the sub-basin scale and 8 buffer zone scales of riparian zone were selected, and Spearman correlation analysis, stepwise regression analysis and redundancy analysis were used to quantitatively explore the impact of land use/landscape pattern on river water quality in the rainy season and non-rainy season. The results showed that the water quality of Shenzhen River-Bay Watershed during the non-rainy season was better than that during rainy season, and the water pollution was more serious in the lower reaches and the outlet of the river. Construction land and forest land were the main landscape types at different spatial scales, and the proportion of construction area and forest area, patch density（PD）, edge density（ED）, mean euclidean nearest neighbor distance（ENN_MN）, CONTAG and aggregation index（AI） were significantly correlated with water quality change. At the scale of 300 m riparian buffer zone in the rainy season, landscape indexes had the most significant impact on water quality, and forest land was the main significant explanatory variable. The water quality of Shenzhen River-Bay Watershed had significant temporal and spatial differencs. In addition to the increase of forest area ratio could improve the water quality, the increase of construction area ratio, ED and PD value would lead to the decrease of water quality. The optimization of landscape pattern within 300 m riparian buffer zone should be emphasized when improving water quality in the basin.

Key words: landscape pattern, water quality, scale, redundancy analysis, Shenzhen River-Bay Watershed

CLC Number:

X824

LI Hong-qing, CHEN Ming-hui, CHENG Fei-fei. Study on the temporal and spatial scale effects of landscape pattern on river water quality in Shenzhen River-Bay Watershed[J]. HUBEI AGRICULTURAL SCIENCES, 2023, 62(1): 54-63.

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