关键词: 转化基因, 转化基因, 筛选标记, 再生体系的建立, 转化方法

Abstract:

The area for research is Liyang City, Jiangsu Province. The object of research was evaluation on cultivated land productivity. The software resource in cultivated land at county level management system was taken as application platform. The GIS technology was used for dealing and combining all kinds of properties data and spaces data. And the unit of evaluation was formed by combining of land present usage images and soil images. By considering the nature essential factors of cultivated land, 12 factors were chosen as the evaluation factors. By using the mathematical analysis theories such as correlation analysis, factor analysis, fuzzy evaluation, AHP (Analytic Hierarchy Process) and so on, hierarchical structure was constructed, evaluation factors were set up which belonged to the models of membership function and calculated the weighting of each factor. A method of evaluation on cultivated land productivity that combines on qualitative and rational had been built. In this paper, the number and limit of cultivated land productivity level was determined by using the method of cumulative frequencies curve. The cultivated land which total area was 56251 hectares in Liyang City, which had been divided into five levels. And the area and percentage of five levels land were that: 1st was 1309 hm2 and 2.30%, 2nd was 20689 hm2 and 36.78%, 3rd was 31097 hm2 and 55.28%, 4th was 3136 hm2 and 5.60%, 5th was 20 hm2 and 0.04%. The results of research in this paper showed that the divisions of cultivated land productivity levels and proportion of each level were scientific and objective. The results reflected the status of cultivated land productivity correctly in the researching area, and it was basically in line with local objectivity. It indicated that the method of research has feasibility and scientificalness for the evaluation on cultivated land productivity. And the results were instructive to manage cultivated land scientifically.