Journal of Geo-information Science >
Progress on Methods of Grassland Degradation and Weed Invasion Monitoring Based on Remote Sensing
Received date: 2012-11-30
Revised date: 2013-06-28
Online published: 2013-09-29
Grassland degradation is one of the important ecological problems in China. During recent years, influenced by global warming and increasing human activities, different degrees of grassland degradation have occurred in China, which has become a research focus in the field of grassland ecology. Based on the systematic summary of studies in the grassland degradation and weed invasion in the latest decade, the limitations of traditional methods of monitoring grassland degradation and weed invasion by remote sensing are put forward, and some important study directions and priorities for future are reviewed. Grassland degradation is often shown as decline in species of high quality forage and increase in the number of weed species at the community scale. In the process of grassland degradation, weed species invasion leads to the increase of vegetation coverage. And thus traditional methods of monitoring grassland degradation based on the decrease of vegetation coverage, productivity and grass yield are limited in detecting the change characteristics of plant population, especially the process of weed species invasion. The results of our research show that there exists great limitations in using traditional methods to detect the change characteristics of plant population, but the weed invasion monitoring method using hyper-spectral data can detect the weed species in plant population and retrieve the area proportion, height and coverage, through making full use of the ample spectral information of hyper-spectral data, and integrate field measuring using spectrometer with quantitative analysis of spectral difference of plant population characteristics on grassland degradation. The studies on methods of monitoring grassland degradation and weed invasion using hyper-spectral data can provide important indicators of community succession process and trend for grassland degradation monitoring and treatment. It can also effectively solve the defects in traditional methods of monitoring grassland degradation based on remote sensing and provide new remote sensing methods for monitoring grassland degradation and weed invasion.
Key words： grassland degradation; weed invasion; remote sensing monitoring
JUE Dan, LI Shuang, XU Xin-Liang, WANG Chang-Zuo, TONG La-Ga . Progress on Methods of Grassland Degradation and Weed Invasion Monitoring Based on Remote Sensing[J]. Journal of Geo-information Science, 2013 , 15(5) : 761 -767 . DOI: 10.3724/SP.J.1047.2013.00761
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