Study On Land Use Characteristics And Increment Of Protected Land

In recent years, with the constant sharpening of human-land contradiction, and the constant deepening of agricultural structure adjustment, protected land has been the important way to improve agriculture efficiency and to promote the resource's high-efficient use. The study on the land use characteristics of protected land make it possible that the protected land could develop smoothly in a healthy way.Based on analyzing the concept and the productive features of protected land, the paper analyzes protected land use multi-dimensional characteristic, productivity non-natural trait, intensive and high-efficient trait and the way and essence of protected land increment. By introducing the concept of Land Equivalent Ratio(LER), this paper compares protected land with open land, sets up three indexes to express protected land's land use ratio raising and its land increment: Protected land Equivalent Ratio of Yield(PLERY), Protected land Equivalent Ratio of Production Value(PLERPV), Protected land Equivalent Ratio of Net Income(PLERNI).After theory analysis of protected land, selecting the vegetable protected land in Quzhou county Hebei province as sample area, investigating the planting situation of vegetable protected land and open land by "twin" method, this paper calculates PLERY, PLERPV and PLERNI, and analyzes them by SPSS. Then, on the premise that PLERNI is known, this paper sets up the relations of protected land increment, PLERNI and open land value, by assessing open land value to calculate protected land increment and protected land value. It is valuable in theory and practice to assess protected land increment and to forecast protected land development.