科研之友
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摘要
The purpose of this investigation was to determine the feasibility of using the Chlorophyll Content Index (CCI) from a CCM-200 unit as an estimator of the seasonal variation of leaf pigment [Chlorophyll a (Chla), chlorophyll b (Chlb), and total chlorophyll (TChl = Chla + Chlb)] content for a range of mangrove species within a degraded environment of the Mexican Pacific. Two seasons (dry and rainy) of measurements were made on six mangrove classes: healthy and dwarf Avicennia germinans (Linnaeus) Linnaeus, healthy and poor condition Rhizophora mangle Linnaeus, and healthy and poor condition Laguncularia racemosa (Linnaeus) C.F. Gaertn. Tests of leaf pigment contents from 360 CCI readings (30 per class) indicated that each equation was a valid predictor of Chla and TChl for all six mangrove classes during both seasons. However, there was a poorer fit (lower R-2) for the three species in poor/dwarf condition during the rainy season. Chla and TChl were statistically well correlated with all of the CCI data; however, the correlating Chlb were lower (R-2 < 0.68) for all classes except dwarf condition A. germinans (R2 = 0.80). The strong relationship observed between the readings from the portable CCM-200 and the pigment content suggest that the handheld CCM-200 can be a portable cost-effective tool for quickly predicting Chla and TChl content for a range of mangrove forests.
- 出版日期2013-4
