Construction of eco-agriculture at Wangjiagou valley in the hilly loess region of west Shanxi and its trend

Two different but closely contacted regional systems in Wangjiagou valley of the hilly loss region of west Shanxi are analyzed.Choosing thirteen decision variables and applying the linear programme,the regional patterns of eco-agricultural construction of out and in-courtyards are quantified.Then,the main contents and the marked success of eco-agricultural construction in the valley from 1991 to 1995 are expounded.Using the GM(1,1) model of the grey system, the development trend of eco-agriculture in the valley is predicted.