The Study On The Land Resource Security Of Ejina Oasis

Regional land resource security study is the result when the society in arid district developing into certain stage, the support ability of the regional land resource system can not meet the actual need for the development of social economic system and ecological environment system. Whether the land resource system is safe, will produce fundamental influence on all respects of the activity of the mankind (or the living beings ). So, land resource and its security study have already become focus among the academia since 1990s. Ejina oasis, located in the central part of the arid Northwest China, serves as a first ecological defense of the entire region. as the enhancement of the development of mankind resulted in the degradation of oasis environment. So caused the extensive concern, a lot of scholars have proposed various kinds of resuming measures of the ecological environment by doing research from such respects as water resources utilization , development of environment, the degradation of oasis vegetation , comprehensive administration countermeasure ,etc. But the case study of the problems of existence to the oasis and sound development namely oasis land resource security study remains the blank. In view of this, this text: First, under the support of remote sensing and GIS modern space information technology, systematically analyze the current situation and characteristic of the development and utilization of land resource in Ejina banner. Second, on the basis of analyzing land resource system and its influencing factors, confirms its affecting way and direction and sketches subsystem of land carrying capacity and its constituent factors.Third, on the basis of analyzing the feedback relation of the subsystems of land carrying capacity and their constituent factors, land carrying capacity SD model of ejina oasis is set up by applying system dynamics model and through the debugging of the model, the land carrying capacity of different level of consumption (fairly well-off rich type and simply having adequate food and clothing ) under three schemes is predicted in the coming 20 years; Fourth, the degree of land resource security of erjina oasis is confirmed by combining land carrying capacity and Logistic model and analyze the " safe state " of land resource of erjina oasis on this basis. Finally , put forward some countermeasures to the land resource security of ejina oasis; Studies have shown: ⑴The remote sensing investigation result of land resource in 2000 in Ejina Banner showed that the most regional land types is for not utilizing land which formed the subject of the regional land resource. But there is a little distribution of potential land such as marsh and beach which can be developed. What's more, under the influence of natural and social economic condition , land use of this area has obvious differences. Meanwhile, the degree of development and utilization of land resources is low, quality is poor. ⑵Through analyzing the land resource system and its influencing factors has found : the water resource is the main restriction factor on the safe operation of land resource system of ejina oasis; the benign cycle of the ecological environment is the prerequisite and foundation for safely existing and developing of ejina oasis land resource system. ⑶The operation result of the model has shown that every year at least 0.78 billion m3 water should be guaranteed to Ejina oasis. In the meanwhile, on the basis of guaranteeing water consumption of the ecology the quota of irrigating should be reduced, the canal usage factor be improved, the degradation of meadow be weakened and the grass yielding of the grain and all kinds of meadow be increased with higher material input and technological development level or the growth rate of population be controlled. What's more, under the prerequisite of rational adjustment of the farming pattern and benign cycle of ecological environment, to realize the goal of "it make by water"and "last domestic animal with grass"is just the more ideal development model of the Ejina oasis in the future. ⑷Through appraising the safety degree of Ejina oasis land resource found that although adopt the more ideal mode it is difficult to keep rich type living standard within 20 years predicted and the land resource will be in the " dangerous operation state ". Therefore, remind people that self-sufficiency can not realize sustainable development of Ejina oasis. ⑸The key to the safe operation of land resource system lies in the development and improvement of land carrying capacity. For ejina oasis, the increase on land carrying capacity can not be limited to development speed and input in energy ,science and technology or the control over the growth rate of population, should consider external introduction or lighten population pressure to the land, too.