| 1 | The chemical components of the oil dregs of seabuckthorn seed produced in Zhang County, Gansu Province were studied. | |
| 2 | On the index of content of total flavones in leaf of Hippophae rhamnoides L. from Zhangxian county of Gansu, the optimum extracting technology was investigated by using the orthogonal experiment. | |
| 3 | The fourth part is empirical part which analyses farmers'income of the typical major areas-Zhang County of Gansu Province around the returning farmland to forest. |