Spatial different characteristics on relieving and de-farming for eco-environmental rehabilitation in the loess hilly-gully region

Relieving and is identified presently as an important strategic measure for national eco-environmental rehabilitation in the loess hilly-gully region. Based on the issue, the characteristics of relieving and de-farming measure are discussed. The sizes of de-farming slope farmland over 25° and 15° and the quantum of policy allowance of each county are calculated. With the aid of constructed de-farming exponential and policy allowance fund density exponential, 55 counties of the loess hilly-gully region are classified into groups of different levels, and the spatial differentiation characteristics of de-farming sizes and policy allowance are respectively analyzed. It is found out: (1) The area of de-farming slope farmland over 25° is 41.91×10 4hm 2,and the policy allowance is 44.01×10 8yuan(RMB). The area of de-farming slope farmland over 15° is 125.53×10 4hm 2,and the policy allowance is 131.82×10 8yuan. (2) There are two main relieving and de-farming districts in the loess hilly-gully region. The larger district is located in the contiguous areas between Yan, an and Yulin city of northern Shaanxi province, and the smaller one is situated at some counties neighboring on the Liupanshan Mountains in eastern Gansu province and southern Ningxia Hui Autonomous Region. (3) The process of relieving and de-farming project should be divided into two phases. De-farming slope farmland over 25° should be regarded as the main task of the first phase, and that between 25° and 15° as second phase task. (4) To formulate regional policies on relieving and de-farming as soon as possible and put the limited fund to the two main relieving and de-farming districts