松嫩平原土地景观动态对旱灾的影响研究--以吉林省农安县为例

景观结构与功能是景观生态学研究的一个主要方面,景观具有等级结构。从土地利用景观和农田景观两个尺度对地处松嫩平原腹地的农安县的土地景观格局动态进行描述;以地形图和遥感影像为信息源,用景观指数对土地利用景观进行分析;采用多样性指数来描述农田景观结构动态。较为系统地分析了土地景观动态变化对农业旱灾的影响,指出土地利用和农作物结构不合理是造成本区农业旱灾频繁的重要原因。

Effects of landscape on draught occurrences in the Songnen Plain--A case study using Nong'an county as its subject

Landscape structure and function are the major aspects of landscape ecology and landscape has hierarchical structure. The paper describes the dynamic pattern of the landscape represented by Nongan county standing in the Songnen plain from the angles of land use and landscape, and adopts landscape index to analyze land use landscape in accordance with remote-sense and image information; it uses diversity index to depict the dynamic structure of landscape according to the statistic data of the crop-planted areas in various years. On the basis of the crop area suffering draught in various years, and the meteorological data, it systematically analyzes the effects of the dynamic landscape of land use on draught disaster occurrence, pointing out that improper land use and crop arrangement are the major reasons for frequent draught occurrence in the region.