欢迎访问《生态学杂志》官方网站,今天是 分享到:

生态学杂志

• 研究报告 • 上一篇    下一篇

陇中黄土丘陵区乡镇尺度林地转型时空分异:生态建设工程的效用

巩杰*,李红瑛,曹二佳,张金茜,柳冬青,马学成   

  1. (兰州大学资源环境学院/西部环境教育部重点实验室, 兰州 730000)
  • 出版日期:2019-07-10 发布日期:2019-07-10

Spatiotemporal differentiation of forest land conversion on township scale of the loess hilly region in central Gansu: Effectiveness of ecological construction project.

GONG Jie*, LI Hong-ying, CAO Er-jia, ZHANG Jin-xi, LIU Dong-qing, MA Xue-cheng   

  1. (Key Laboratory of Western China’s Environmental Systems (Ministry of Education)/College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China).
  • Online:2019-07-10 Published:2019-07-10

摘要: 基于GIS技术及定西市安定区1995年、2000年、2005年、2010年和2015年5期Landsat遥感影像解译数据,开展乡镇尺度的林地转型来源、幅度、速度和转型时空分异特征研究,并探讨林地变化形式。结果表明:1995—2015年,林地转型数量处于增加态势,草地和耕地是主要来源;1995—2015年林地转型幅度和转型速度均呈先减后增趋势;整个研究时段内,林地转型空间分布有所差异,乡镇林地面积转型各不相同;林地转型变化随着坡度增加而不同,林地净转换量和转型幅度均先升后降,而转型速度与其相反,林地转型主要发生在坡度15°以上区域。

关键词: 氮沉降, 碳/氮矿化, 苔原带, 长白山

Abstract: Based on GIS techniques and Landsat images, the transformation source, extent and speed of forest land use, and the spatiotemporal differentiation characteristics of forest land transformation were obtained on the township scale for Anding District, Dingxi City in 1995, 2000, 2005, 2010 and 2015. From 1995 to 2015, the total area of forest land transformation was increasing, with the grassland and cultivated land being the main sources. The forest land transformation extent and transition speed showed a tendency of decrease first and then increase from 1995 to 2015. The spatial distribution of forest land transformation differed, and the transformation area of forest land in each town was also different. The change of forest land transformation differed with the increasing slope. Both the net conversion and transformation extent of forest land showed a trend of increase first and then decease, but with opposite transformation speed. The major transformation of forest land occurred in the area with slope larger than 15°.

Key words: tundra zone, nitrogen deposition, carbon and nitrogen mineralization, Changbai Mountains.