Spectral vegetation indices for estimating shrub cover, green phytomass and leaf turnover in a sedge‐shrub tundra
Spectral vegetation indices for estimating shrub cover, green phytomass and leaf turnover in a sedge‐shrub tundra
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用于估计莎草灌木苔原灌木覆盖、绿色植物质量和叶子周转率的光谱植被指数
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发表时间：
2008
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通讯作者：
M. Fukuda
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作者：
K. Kushida;Yongwon Kim;S. Tsuyuzaki;M. Fukuda
利用野外观测，研究了美国阿拉斯加州北极国家野生动物保护区的一个莎草-灌木苔原群落的光谱指数与灌木比例、绿色植物量和叶片周转率之间的关系。我们建立了一个50米× 50米的地块（69.73°N 143.62°W），位于避难所的洪泛区。样地植被以杨柳灌木（毛柳）和苔草（苔草）为主。2007年7月至8月，我们在灌木覆盖的地面（灌木样方）和没有灌木的地面（莎草样方）建立了10个0.5 m × 0.5 m的样方。灌木比例与归一化差值植被指数（NDVI，R2为0.57）的相关性比归一化差值红外指数（NDII），土壤调整植被指数（SAVI）或增强植被指数（EVI）更强。另一方面，无论是绿色植物量和叶片周转，最强的相关性是与NDII（R2分别为0.63和0.79）。
Using field observations, we determined the relationships between spectral indices and the shrub ratio, green phytomass and leaf turnover of a sedge-shrub tundra community in the Arctic National Wildlife Refuge, Alaska, USA. We established a 50‐m × 50‐m plot (69.73°N 143.62°W) located on a floodplain of the refuge. The willow shrub (Salix lanata) and sedge (Carex bigelowii) dominated the plot vegetation. In July to August 2007, we established ten 0.5‐m × 0.5‐m quadrats on both shrub‐covered ground (shrub quadrats) and on ground with no shrubs (sedge quadrats). The shrub ratio was more strongly correlated with the normalized difference vegetation index (NDVI, R2 of 0.57) than the normalized difference infrared index (NDII), the soil-adjusted vegetation index (SAVI) or the enhanced vegetation index (EVI). On the other hand, for both green phytomass and leaf turnover, the strongest correlation was with NDII (R 2 of 0.63 and 0.79, respectively).