土地利用变化下沿海地区吸附态磷负荷动态变化研究
发布时间：2019-01-07 10:55
【摘要】：吸附态磷是主要的面源污染物之一,它会导致水域环境质量恶化,是水体富营养化的重要污染源。科学估算吸附态磷污染负荷能够为治理沿海地区非点源污染,保护海洋生态安全提供理论依据。以遥感影像、降雨监测资料等多源数据为基础,综合考虑土壤侵蚀、泥沙输移率、磷富集系数等影响因子,构建吸附态磷负荷估算模型,估算了江苏沿海地区2000~2010年吸附态磷负荷量,分析了不同土地利用背景下吸附态磷负荷的动态变化特征,结果显示:(1)2000~2010年,江苏沿海地区吸附态磷负荷明显增加,平均吸附态磷负荷模数由105.89 kg/km2·a增长至201.67 kg/km2·a,吸附态磷负荷总量由3 284t增长至6 255t。(2)10 a间,研究区的吸附态磷负荷热点面积减小,呈现出收敛聚集的态势,但热点区的吸附态磷负荷总量却明显增加,说明研究区内吸附态磷负荷的空间极化现象更为显著。(3)10 a间,各土地利用类型的平均吸附态磷负荷模数都显著增长,不同土地利用背景下吸附态磷负荷总量排序为水田旱地林地草地未利用地园地。研究结果表明,不同土地利用背景下吸附态磷负荷存在显著差异,且不同土地利用类型相互转化时,吸附态磷负荷也随之发生变化,可通过调整土地利用结构,优化景观格局,减少和控制磷污染的发生。
[Abstract]:Adsorbed phosphorus is one of the main non-point source pollutants, which will lead to the deterioration of water environmental quality and is an important source of water eutrophication. Scientific estimation of adsorptive phosphorus pollution load can provide a theoretical basis for the control of non-point source pollution in coastal areas and the protection of marine ecological security. Based on multi-source data such as remote sensing image and rainfall monitoring data, a model for estimating the load of adsorbed phosphorus was established by considering the influence factors such as soil erosion, sediment transport rate, phosphorus enrichment coefficient and so on. The load of adsorbed phosphorus in coastal areas of Jiangsu Province from 2000 to 2010 was estimated, and the dynamic characteristics of the load of adsorbed phosphorus in different land use backgrounds were analyzed. The results showed that: (1) the load of adsorbed phosphorus in coastal areas of Jiangsu increased obviously from 2000 to 2010; The average adsorption phosphorus load modulus increased from 105.89 kg/km2 a to 201.67 kg/km2 a, and the total adsorbed phosphorus load increased from 3 284 t to 6 255 t. (2) within 10 years, the hot spot area of adsorbed phosphorus load decreased in the study area. However, the total amount of adsorbed phosphorus load in hot spots is obviously increased, which indicates that the spatial polarization phenomenon of adsorbed phosphorus load in the study area is more obvious. (3) within 10 years, The average absorbed P load modulus of each land use type increased significantly, and the total amount of adsorptive phosphorus load in different land use background was ranked as paddy field, dry land, woodland and grassland unused garden land. The results showed that there were significant differences in the load of adsorbed phosphorus under different land use background, and when different types of land use changed with each other, the load of adsorbed phosphorus changed, and the landscape pattern could be optimized by adjusting the structure of land use. Reduce and control phosphorus pollution.
【作者单位】： 南京大学地理与海洋科学学院;中国科学院流域地理学重点实验室-中国科学院南京地理与湖泊研究所;江苏省土地勘测规划院;扬州市江都区国土资源局;
【基金】：国土资源部海岸带开发与保护重点实验室开放基金项目(NO.2015CZEPK01)~~
【分类号】：X52
本文编号：2403573
[Abstract]:Adsorbed phosphorus is one of the main non-point source pollutants, which will lead to the deterioration of water environmental quality and is an important source of water eutrophication. Scientific estimation of adsorptive phosphorus pollution load can provide a theoretical basis for the control of non-point source pollution in coastal areas and the protection of marine ecological security. Based on multi-source data such as remote sensing image and rainfall monitoring data, a model for estimating the load of adsorbed phosphorus was established by considering the influence factors such as soil erosion, sediment transport rate, phosphorus enrichment coefficient and so on. The load of adsorbed phosphorus in coastal areas of Jiangsu Province from 2000 to 2010 was estimated, and the dynamic characteristics of the load of adsorbed phosphorus in different land use backgrounds were analyzed. The results showed that: (1) the load of adsorbed phosphorus in coastal areas of Jiangsu increased obviously from 2000 to 2010; The average adsorption phosphorus load modulus increased from 105.89 kg/km2 a to 201.67 kg/km2 a, and the total adsorbed phosphorus load increased from 3 284 t to 6 255 t. (2) within 10 years, the hot spot area of adsorbed phosphorus load decreased in the study area. However, the total amount of adsorbed phosphorus load in hot spots is obviously increased, which indicates that the spatial polarization phenomenon of adsorbed phosphorus load in the study area is more obvious. (3) within 10 years, The average absorbed P load modulus of each land use type increased significantly, and the total amount of adsorptive phosphorus load in different land use background was ranked as paddy field, dry land, woodland and grassland unused garden land. The results showed that there were significant differences in the load of adsorbed phosphorus under different land use background, and when different types of land use changed with each other, the load of adsorbed phosphorus changed, and the landscape pattern could be optimized by adjusting the structure of land use. Reduce and control phosphorus pollution.
【作者单位】： 南京大学地理与海洋科学学院;中国科学院流域地理学重点实验室-中国科学院南京地理与湖泊研究所;江苏省土地勘测规划院;扬州市江都区国土资源局;
【基金】：国土资源部海岸带开发与保护重点实验室开放基金项目(NO.2015CZEPK01)~~
【分类号】：X52
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