| 土地利用结构与景观格局对黎河水质的影响 |
| Impacts of Land Use Structure and Landscape Pattern on Water Quality in Lihe River |
| 投稿时间：2023-05-12 修订日期：2023-07-06 |
| DOI：10.15928/j.1674-3075.202305120128 |
| 中文关键词:水质 土地利用 景观格局 引滦入津工程 黎河 |
| 英文关键词:water quality land use landscape pattern Luanhe-Tianjin water diversion project Lihe River |
| 基金项目:清华大学水沙科学与水利水电工程国家重点实验室开放研究基金项目（sklhse-2020-A-01） |
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| 中文摘要: |
| 黎河是引滦入津工程的唯一通道，探究土地利用结构与景观格局对黎河水质的影响，可为合理优化流域土地资源、保护流域水质安全提供参考。2022年3月至6月选取了12个水质监测点进行水样采集，选用化学需氧量（COD）、氨氮（NH+ 4-N）、总磷（TP）、溶解氧（DO）和高锰酸盐指数（CODMn）5个水质指标进行检测。基于遥感数据和土地利用数据，利用GIS软件生成4种空间尺度的圆形缓冲区域，提取了不同空间尺度的景观格局指数，采用相关分析和冗余分析（RDA），探讨了土地利用结构与景观格局对水质的影响。结果表明：(1)黎河水质整体偏好，总体达到Ⅱ类标准，但仍存在超标水质，其中输水期水质明显好于非输水期。多数点位COD、TP值超过Ⅱ类水质标准限值，其余水质指标年均浓度均达到Ⅱ类以内水质标准。(2)不同尺度缓冲半径内占地类型均以林地、耕地、建设用地为主，建设用地、水域面积比例的增加可导致水质的恶化，林地、草地增加可对水质起到提升作用。(3)不同空间尺度缓冲区景观格局指数对水质具有较好的解释度，500 m半径缓冲区景观格局对水质的解释能力最强，解释度达59.8%，其次为1 000 m尺度（56.0%）。因此，要加强500 m半径缓冲区尺度土地利用的优化，严格控制流域建设用地、水域面积的增加。 |
| 英文摘要: |
| Impacts of Land Use Structure and Landscape Pattern on Water Quality in Lihe River
Lihe River is the only channel of the water diversion project from the Luanhe River to Tianjin and it plays an important role in maintaining water quality for Tianjin residents. It also serves as an important ecological corridor for Zunhua City?in terms of potable water, flood control, irrigation and habitat conservation. In this study, we explored the impacts of land use structure and landscape pattern on water quality in Lihe River, aiming to provide a scientific reference for protecting water quality in the Luanhe-Tianjin water diversion project and optimizing the landscape pattern along the river. From March to June of 2022, a water quality investigation was carried out at 12 monitoring sites in the Zunhua section of Lihe River, and 5 representative water quality indicators were measured, including chemical oxygen demand (COD), ammonia nitrogen (NH+ 4-N), total phosphorus (TP), dissolved oxygen (DO) and the permanganate index (CODMn). Based on remote sensing images and land use data, GIS software was used to generate circular buffer regions around the monitoring points at four scales (500 m, 1 000 m, 1 500 m, 2 000 m) as water quality response units, and landscape pattern indices at each of the four spatial scales were extracted. The impacts of land use and landscape pattern on water quality were explored by redundancy analysis and correlation analysis. Results show that: (1) Water quality in Lihe River was generally good and most waters met Class II surface water quality standard. Among the water quality indicators, COD and TP values at most monitoring points exceeded the Class Ⅱ water quality standard. Water quality in the water transport period (June) was obviously better than that in the non-water transport period (March to May). (2) Land use in the research area was classified into six types: construction land, forest land, cultivated land, grassland, surface water and un-used land. Land use types within the circular buffer regions were primarily forest land, cultivated land and construction land. An increase in the proportions of construction land and water area led to a deterioration of water quality, and an increase in forest land and grassland improved water quality. (3) Landscape pattern indices of the buffer zone at different spatial scales explained the water quality well, and the landscape pattern within the 500 m circular buffer zone had the strongest explanatory power for water quality (59.8%), followed by the 1 000 m buffer zone (56.0%). Therefore, it is necessary to strengthen the optimization of land use within the 500 m buffer zone, and strictly control increases in construction land and water area in the Lihe River basin. These research results provide a basic reference for the rational optimization of land resources, consequently protecting water quality in the basin. |
| 米秋菊,边玉明,甄立鹏,庞 迪,王 凉,程伍群,李金金.2024.土地利用结构与景观格局对黎河水质的影响[J].水生态学杂志,45(3):78-85. |
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