Comments on the use of the vegetation health index over Mongolia
Comments on the use of the vegetation health index over Mongolia
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DOI：
10.1080/01431160500121727
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发表时间：
2006-05-01
影响因子：
3.4
通讯作者：
Tucker, CJ
中科院分区：
文献类型：
--
作者：
Karnieli, A;Bayasgalan, M;Tucker, CJ
植被健康指数是根据从植被信号中提取的产品，即归一化差异植被指数和亮温，两者都来自美国国家海洋和大气管理局高级甚高分辨率辐射计传感器。VH用户依赖于NDVI和地表温度之间的强烈的负相关性，因为不断上升的地表温度被认为对植被活力产生负面影响，从而造成压力。这封信探讨了这一假设与数据从蒙古纳入信息从六个不同的生态系统。结果发现，北方生态系统的特点是正相关，这意味着温度上升有利于影响植被活动。因此，在高纬度地区应谨慎使用VHI。
The Vegetation Health index (VHI) is based on a combination of products extracted from vegetation signals, namely the Normalized Difference Vegetation Index (NDVI) and from the brightness temperatures, both derived from the NOAA Advanced Very High Resolution Radiometer (AVHRR) sensor. VH users rely on a strong inverse correlation between NDVI and land surface temperature, since increasing land temperatures are assumed to act negatively on vegetation vigour and consequently to cause stress. This Letter explores this hypothesis with data from Mongolia incorporating information from six different ecosystems. It was found that the northern ecosystems are characterized by positive correlations, implying that rising temperature favourably influences vegetation activity. It is concluded that the VHI should be used with caution, especially in high latitude regions.