Relations between NDVI and tree productivity in the central Great Plains
Relations between NDVI and tree productivity in the central Great Plains
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DOI：
10.1080/0143116032000160499
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发表时间：
2004-08
影响因子：
3.4
通讯作者：
J. Wang;P. Rich;K. Price;W. Kettle
中科院分区：
文献类型：
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作者：
J. Wang;P. Rich;K. Price;W. Kettle
遥感归一化植被指数（NDVI）是一个很好的衡量景观尺度上光合活性的指标，可以用来估计生产力。我们的研究表明，NDVI与大平原中部森林树木生产力的地面测量之间存在很强的关系。标准化树木年轮宽度、直径增大和种子产量均与同一生长季的综合NDVI呈显著正相关。给定年份的树高增长与前一年的综合NDVI相对应，即一年滞后。以凋落物量衡量的叶片产量变化通常与NDVI的变化相对应，但不像其他树木生产力指标那样明显。虽然叶片产量与整个生长季的综合NDVI相关性最好，但大多数树木生产力测量值与生长季早期的综合NDVI相关性最好。除叶片产量外，所有树木生产力指标都与中间空间尺度（7×7像素，~ 50 km2）的平均NDVI相关，而不仅仅与局部NDVI相关（1像素，1.2 km2）。总的来说，NDVI是树木年生产力的一个很好的预测指标。
Remotely sensed Normalized Difference Vegetation Index (NDVI) is a good measure of photosynthetic activity at landscape scales, and can be used to estimate productivity. Our research demonstrates strong relations between NDVI and ground-based measurements of productivity for forest trees in the central Great Plains. Standardized tree ring width, diameter increase and seed production all are strongly correlated with integrated NDVI of the same growing season. Tree height growth for a given year corresponds with integrated NDVI of the previous year, i.e. a one-year lag. Variation in foliage production, as measured by litterfall, generally corresponds with variation in NDVI, but not as distinctly as do other tree productivity measures. Although foliage production is best correlated with NDVI integrated over the entire growing season, most tree productivity measurements are best correlated with NDVI integrated over the early growing season. All tree productivity measures, except foliage production, are better related to NDVI averaged over an intermediate spatial scale (7×7 pixels, ∼50 km2), rather than just local NDVI (1 pixel, 1.2 km2). Overall, NDVI is an excellent predictor of annual tree productivity.