Soil Quality Assessment In Fangshan District In Beijing

Fangshan district is one of the most important green barrier of Beijing, as well as one of the important green food bases. With the rapid development of the dominant industry such as Mopan persimmons, exurban agriculture in Fangshan has been formed gradually, so the soil quality and the sustainable development of soil become the key to the development of Fangshan agriculture. According to the green food producing area environmental quality standard, through the sampling, detecting and analysis, the soil quality assessment will be done in this paper. Based on the original assessment, the potential assessment to develop green food base will be carried out, according to the result, the soil graduation will be measure off. This will provide great reference for layout of the land use and development of green food bases.Three kind of soil will be sampled in 22 villages and towns in Fangshan district. Assessment indicator system include fertility indicator and heavy metal indicator, thereinto the fertility indicator include organic matter, pH, available N, Olesen-P and available K, heavy metal indicator include Cd, Cr, Pb and Hg. The results indicate that soil chemical character and heavy metal content shows visible difference under vary land use types. So we can conclude that human activities have influence the soil quality in different land use types obviously.According to Green food-Technical conditions for environmental of area, soil quality assessment of Fangshan is implement. The assessment result shows that in theory all soil is suitable for developing green food, but in fact the potential to develop green food in different villages and towns have large differences, so the potential assessment to develop green food is carried out. The soil quality in Puwa, Xiayunling and Shidu are excellent, and suitable to be developed to green food bases; the soil quality in Zhangfang, Liulihe, Changyang, Daanshan and Shijiaying are relativity good, in those areas, adaptive crop can be planted according their character. The soil quality in Yanshan, Hebei, Dashiwo, Changgou, Liangxiang and Zhoukoudian are the worst, unsuitable to develop green food.