利用绿色植被在可见光和近红外波段中反射率的差异叶绿素在近红外波段的反射率显著加大并决定叶绿素含量可监测植被生长状况通常用NDVI=Ch2-CH1/ Ch2+Ch1 来表示
因此，以县为单元，研究建立荒漠化植被监测的框架和信息处理和评价方法很有必要。
Therefore, it is very necessary to research methods and establish a framework of desertification vegetation monitoring and evaluation information system at the county level.
笔者根据东亚酸雨监测网土壤和植被监测技术规范方法，研究了酸沉降对森林生态系统土壤和植被的影响和危害。
The effect and harm of acid deposition on soil and vegetation of forest ecosystem were studied according to guidelines and technical manuals for acid deposition monitoring network in East Asia.
如今，科学家试验了一种新的方法，通过测量人类肉眼观测不到的植被释放物质，监测其健康状况。
Now scientists have tested a new method for monitoring the health of vegetation by measuring emissions that the human eye cannot detect.
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