Consideration on Design for Park of Soil and Water Conservation and Eco-sci-technology

Baifoshi watershed, locates in the hinterland of Sichuan Basin. Based on social economical condition and the status quo land-use, this design for park of soil and water conservation and eco-sci-technology has been completed. From the very beginning, both reconstructing the eco-environment, developing the area industrial chain, and the application of new technology of soil and water conservation, are the two aims. And the practice of this design will set example for soil and water conservation, eco-environment construction, and study the method for sustainable development in small watershed in the upper reaches of the Yangtze River. 1 General settings The studied watershed, Baifoshi Watershed, locates in the hinterland of Sichuan Basin and ranges from 105 04 22 E in the east to 105 45 58 E in the west, and from 30 10 50 N in the south to 30 39 25 in the north, covering total area of 3,025 square kilometers. This watershed, crossed from north to south by a weir, lies near the Fujiang River, one first class branches of the Jialing River. The landform in the watershed fluctuates from east - north to south - west. And soil is mainly purple soil, whose PH values ranging from 4.77 to 6.26, and content of organic matter and N, P Concentration are quite low. In the past, it is a watershed with many forests, and now, the vegetable cover rate is only 7.6%, however. In addition to this, the annual average temperature varies only from 16.7 to 18.0 , and annual rainfall from 993.3mm to 1,443.3mm. From March to July, the rainfall increases step by step, but decreases from August to next February. Therefore, the rainfall in summer semi-year is 804.5mm, 81% of the total, and winter semi-year 188.8 mm, 19% of the total. Moreover, the statistic data in 2000 present that there are 19,041 residents in this watershed, among which, 18,846 are farmers. 2 Aims of design on eco-sci-tec park