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东江流域水土流失区水土资源评价是在“广东省东江流域防治水土流失措施与规划调查研究的基础上选择典型──惠阳县上杨地区进行的重点深入研究之一。本区水土资源丰富，但成立大亚湾经济开发特区后，工业用水和居民用水激增，水资源不足，需要从西枝江取水补充。土地资源评价，首先应用土地发生学理论将本区划分出10种土地类型，制定出5个土地资源评价因子和指标，并参照国内外土地资源评价分级标准采用八级制进行评价，本区无一等地，二等地最多，占总土地面积33．5％，四级地最少，占总土地面积的1．3％。
The evaluation of water and soil resources in the soil and water loss area of Dongjiang River Basin is one of the most important studies based on the investigation and study of measures and plans for soil and water loss prevention and control in the Dongjiang River valley in Guangdong Province. The area is rich in water and soil resources, After the establishment of the Daya Bay Economic Development Zone, industrial water and residential water use have increased sharply, and water resources have been insufficient, which needs to be supplemented by water from the Xizhi River.Firstly, based on land-use theory, the area is divided into 10 kinds of land types and 5 Land resources evaluation factors and indicators, and with reference to domestic and international land resources evaluation grading standards using eight-level system for evaluation, the district no first-class, second largest, accounting for 33.5% of the total land area, the least four, accounting for 1.3% of the total land area.