关键词: 苏云金芽孢杆菌, 苏云金芽孢杆菌, 美国白蛾, PCR-RFLP

Abstract:

In order to provide effective decision-making reference in rational land use and land protection for the departments, this paper classified, summarized and processed the cultivated land data of Changchun based on the statistics, and then analyzed the study subject quantitatively. The results showed that: from 2002 to 2008, the cultivated land of Changchun showed fluctuant growth trend overall; the change of cultivated land was active, and the flow rate was about 2 times the outflow rate; woodland and grassland were the main flow direction of the cultivated land, the newly reclaimed land was its main source. From the spatial distribution, there were significant differences in the cultivated land variation among regions. The development of society and economy had important influence on the cultivated land, and local policies and regulations were one of the key factors to guide the rational land use. This study concluded that the relevant statistics could reflect the land use conditions of local administrative area accurately and effectively.