Cultivated Land Evolution Of Northeast And Its Ecological Environment Result After Founding Of The Nation

The land utilization of Northeast has had the rapid change since the Qing Dynasty. This kind of change mainly concentrates on the increase of cultivated land, namely each kind of land utilization type to farming transformation. The excess development surpassed the local land supporting capacity. The evolution of ecological environment in nearly hundred years is equal to that of south of Yellow River area in about thousands of years. Therefore, the research of Northeast land development and utilization has the great significance. The present research analyzes land utilization change, its driving factor as well as ecological environment result in the small spatial scope and the certain time scope. Moreover, the research limited in the qualitative stage and the quantitative investigation appears few. The research of entire northeast cultivited land that concentrates 1950s is not appeared. This article systematically studies its evolution, driving influence, the ecological environment result and its sustainable use countermeasure through the collection and reorganization of the correlation data in 1950s. The full text is divided into five parts:The first part, summarizes the background and present situation of LUCC research and puts forward related theories through the correlation knowledge study and material read.The second part, first obtains the quantity change situation of the cultivated land for about 50 years. Then it gives the changing characteristics of the different time intervals and that of different area, including Hei Long Jiang, Ji Lin and Liao Ning Province, four alliances and cities of Inner Mongolia. Finally summarizes the space and time rule of cultivated land evolution for 50 years, realizes the spatial analysis in the Northeast region scope breaking the administrative boundary.In the third part, the article first introduces the natural environment foundation of Northeast, proposes advantageous and the adverse condition. Then it separately explains the driving function of population quantity, the economical development, the social environment factor.The fourth part, the ecological environment result research is the key content of this article. The article first proposes some ecological environment questions which are caused by the cultivated land development from the qualitative angle, mainly including soil erosion, the black earth degenerates, wilderness expansion, the soil and the water body pollution, the biodiversity sharp decline. This article also accounts the change of ecology service value caused by cultivated land evolution using the Chinese land ecosystem service unit area value and the calculation method which proposed by Xie gao di. Proposes the ecology service value of Northeast reduced more than 600 billion Yuan in 50 years, averagely reduces 12 billion Yuan every year.The fifth part, briefly introduces the question of cultivated land sustainable use, sustainable use importance and its countermeasure.