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

榆林地区2000—2014年NDVI时空变化

石玉琼1,2,郑亚云2,李团胜2*#br#   

  1. 1山西农业大学林学院, 山西太谷 030801;2长安大学地球科学与资源学院, 西安 710054)
  • 出版日期:2018-01-10 发布日期:2018-01-10

The spatiotemporal change of NDVI in Yulin, Shaanxi Province, China from 2000 to 2014.

SHI Yu-qiong1,2, ZHENG Ya-yun2, LI Tuan-sheng2*   

  1. (1College of Forestry, Shanxi Agricultural University, Taigu 030801, Shanxi, China;2College of Earth Science and Resources, Chang’an University, Xi’an, 710054, China).
  • Online:2018-01-10 Published:2018-01-10

摘要: 为了评价退耕还林的实施效果以及榆林地区生态环境变化,利用MODIS NDVI数据,采用最大值合成法,基于GIS平台,研究榆林地区2000—2014年植被覆盖的时空变化。结果表明:2000—2014年,榆林黄土丘陵沟壑地区NDVI高于风沙滩地区,前者植被覆盖好于后者;15年来,榆林植被覆盖状况总体得到改善,改善面积占90.7%,退化面积仅占1.0%,未变化面积占8.3%。黄土丘陵沟壑区植被改善面积达94.2%,以中度改善为主;坡地植被改善面积达80%以上,7°~35°坡度上植被明显改善的面积达51%以上,退耕还林还草取得了明显的效果。

关键词: 夏玉米, 土壤水分变化, 地-气温差, 模型

Abstract:

In order to evaluate the implementation effect of the Grain for Green Project (conversion of degraded farmland into forest or grass Land) and the eco-environment variation of Yulin, MODIS NDVI data was used to examine the spatial and temporal change of vegetation cover by applying maximum value composite (MVC) method based on the GIS. NDVI was higher in hilly loess region than that in blown sand region from 2000 to 2014. In general, the vegetation had improved during the past 15 years. In whole Yulin, the area of the improved vegetation accounted for90.7%, the area of degradation constituted only 1.0%, and the area of no variation was 8.3%. In hilly loess region, the area of improved vegetation accounted for 94.2%, mainly with moderate improvement. The area of vegetation improvement on slopes accounted for more than 80%. The obvious improvement at 7°-35° slopes constituted more than 51%. Therefore, the effect of the Grain for Green Project was obvious.
 

Key words: model., soil water change, summer maize, land surface-air temperature difference