China Aero Geophysical Survey & Remote Sensing Center for Natural Resources, Beijing, 100083, China.
China University of Geosciences, Beijing, 100083, China.
Environ Monit Assess. 2021 Dec 7;194(1):10. doi: 10.1007/s10661-021-09667-x.
Land use/land cover (LULC) conditions can have a profound impact on the water quality of rivers, lakes, and other water bodies within a basin. Land use status of Daye Lake basin in 2019 has been shown by Landsat 8 OLI image, water quality of Daye Lake, and 12 inflowing rivers have been investigated once a month; this study provides a comprehensive analysis of the water pollution characteristics of the inflowing rivers and lake in the basin under different LULC patterns, and providing a reference for the scientific planning of land-use types in the basin and land use research in lake basins in subtropical areas. Pollutants are mainly introduced to Daye Lake from the west (such as Da Gang) and north (such as Linjiaju Gang), with concentrations gradually decreasing within the lake from west to east. Construction land is closely associated with the total nitrogen (TN), total phosphorus (TP), permanganate index (COD), and ammonia nitrogen (NH-N) inputs to the basin, which can be trapped by vegetation. Agricultural dryland can contribute acid and dissolved oxygen (DO) to water. Precipitation can influence the input of pollutants, with a stronger effect on TN and weaker effect on TP. Pollutants accumulate from the inlets to the centre of the lake, with longer retention times during the dry season.
土地利用/土地覆盖（LULC）状况会对流域内的河流、湖泊等水体的水质产生深远影响。利用 Landsat 8 OLI 图像展示了 2019 年大冶湖流域的土地利用状况，每月对大冶湖的水质和 12 条入湖河流进行一次调查；本研究全面分析了不同土地利用方式下流域内入湖河流和湖泊的水污染特征，为流域土地利用类型的科学规划和亚热带地区湖泊流域的土地利用研究提供了参考。污染物主要从西部（如大岗）和北部（如林家咀港）输入到大冶湖，从西向东，湖泊内污染物浓度逐渐降低。建设用地与流域总氮（TN）、总磷（TP）、高锰酸盐指数（COD）和氨氮（NH-N）的输入密切相关，可以被植被截留。旱地农业可以为水体提供酸和溶解氧（DO）。降水会影响污染物的输入，对 TN 的影响较强，对 TP 的影响较弱。污染物从入湖口向湖心累积，枯水期停留时间较长。
