Relationships between Normalized Difference Vegetation Index (NDVI) and carbon fluxes of biologic soil crusts assessed by ground measurements
Relationships between Normalized Difference Vegetation Index (NDVI) and carbon fluxes of biologic soil crusts assessed by ground measurements
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DOI：
10.1016/j.jaridenv.2005.06.025
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发表时间：
2006-03-01
影响因子：
2.7
通讯作者：
Kesselmeier, J
中科院分区：
文献类型：
--
作者：
Burgheimer, J;Wilske, B;Kesselmeier, J
研究了生物结皮、光谱反射率与光合活性之间的关系。在2002-2003年雨季期间，在以色列内盖夫沙漠西北部的沙丘和黄土环境中进行了20次实地活动，每次持续数天。对几种生物传感器进行了CO2净交换和光谱反射率的测量。归一化植被指数（NDVI）是从BSC反射率和相关的CO2交换数据。详细讨论了土壤水分、气温、光照强度等环境因子对植被指数与CO2交换的影响。相当好的相关性，发现在雨季。NDVI是有用的，在指示潜在的BSC同化活动的规模和能力。此外，该指数对应以及不同类型的微型植物的光合活性的不同速率。结果表明，BSC的光谱反射率可以与光合活性和poseses的潜力，以评估这些微型植物的碳固存量的面积尺度上使用卫星图像。(c)2005爱思唯尔有限公司保留所有权利。
The aim of this research was to study the relationships between the biological soil crusts (BSC), spectral reflectance and photosynthetic activity. Twenty field campaigns, each lasting several days, were conducted during the 2002-2003 rainy season at sand dune and loess environments in the north-western Negev desert of Israel. SiluldtaneOUS measurements Of CO2 net exchange and spectral reflectance were carried out for several types of BSC. The Normalized Difference Vegetation Index (NDVI) was derived from the BSC reflectance and correlated with their CO2 exchange data. The relationship between NDVI and CO2 exchange is discussed in detail with respect to environmental factors, such as soil water content, air temperature, and light intensity. Fairly good correlations were found in the rainy season. The NDVI was useful in indicating the potential magnitude and capacity of the BSC assimilation activity. Furthermore, the index corresponded well with different rates of photosynthetic activity of the different types of microphytes. The results demonstrate that spectral reflectances of the BSC can be related to photosynthetic activities and posseses the potential to assess the amount of carbon sequestration by these microphytes on an areal scale using satellite images. (c) 2005 Elsevier Ltd. All rights reserved.