Impact of Land Use Patterns on Eco- environment in Pear l River Estuary
土地利用方式对珠江河口生态环境的影响分析

In recent years, land use patterns in Pearl River Delta have changed a lot in such fields as aggravation of urbanization level, decreasing of vegetation coverage rate, and reduction of agricultural land, leading to in changes composition and amount of main land-source pollutants (sands, nutrient elements of nitrogen and phosphorus, heavy metals and organic pollutants). Land- source pollutions result in continuous deterioration of water environment in Pearl River Estuary and degradation of ecological functions, which leads to decrease of biodiversity , bioenrichment of heavy metals and organic pollutants, frequent breakout of red tides, deterioration of wetland functions and so on. The composition and amount of land-source pollutions is affected by land use patterns, so it is important for ecological restoration of Pearl River Estuary environment to make clear the relationship between land use patterns and pollution of estuary environment and to decrease the amount of land sources pollutions by changing land use patterns. The relationship between land use and estuary has characteristics of basins, frequently affected by outside, and water cycle is one of very important driving factors. So distributed hydrological models which have developed rapidly in recent years are methods to solve this scientific problem.