Subjects: Biology >> Botany >> Applied botany submitted time 2021-12-19 Cooperative journals: 《广西植物》
Abstract： Leaf chlorophyll content is central to carbon, water and energy exchange between the biosphere and the atmosphere, also to the terrestrial ecosystem function. Quantitative estimates of leaf chlorophyll content with hyperspectral imagery can provide scientific insight for assessing plant’s growth and stress as affected by abiotic and biotic factors. However, few studies have been conducted the application of spectral indices in estimation of leaf chlorophyll contents of plants in karst areas, especially in South China. After a review of the application of common spectral indices in estimation of leaf biochemistry parameters, we found that most of the common spectral indices were developed based on the difference, simple ratios, normalized difference and inverse difference formulation of leaf spectral reflectance. Therefore, we firstly measured the raw reflectance spectra of leaves from four typical karst species, namely Vitex negundo, Rhus chinensis, Celtis sinensis and Alchornea trewioides with a ASD Field Spec 4 (Analytical Spectral Devices, Inc., Boulder, Colorado, US) spectrometers. We then used the above-mentioned four formulations to process the raw reflectance spectra and their first-order derivative spectra. Finally, we analyzed the relation between leaf chlorophyll contents and relative leaf raw reflectance spectra and their first-order derivative spectra, and tried to propose the best spectral index for estimation leaf chlorophyll content of the plants of karst areas in South China. The results were as follows: (1) Among the common spectral indices, the modified normalized difference vegetation index (mND705) performed well in estimation leaf chlorophyll contents of four typical karst species in term of the determination coefficient (R2 was equal to 0.45) and root mean squared error (RMSE was equal to 0.26 mg•g-1). (2) However, most of the common spectral indices were not suitable for estimation leaf chlorophyll content of the plants in karst areas. Thought the prediction capability of fluorescence ratio index (FRI1) and chlorophyll absorption area index (CAAI) were almost the same in estimation of leaf chlorophyll content of plants in karst and non-karst areas, their accuracy of prediction was relative low according to the determination coefficient. (3) The spectral indices proposed in this study performed well in estimation leaf chlorophyll content of the plants in karst areas either based on the raw reflectance spectra or their first-order derivative spectra compared against others common spectral indices, especially for the difference spectral index based on the first-order derivative spectra (dD(760, 769)). Its determination coefficient was 0.71 and the root mean squared error was 0.19 mg•g-1. We, therefore proposed that the difference spectral index based on the first-order derivative spectra (dD(760, 769)) can be used for estimation leaf chlorophyll content of the plants in karst areas. Our results concluded that leaf chlorophyll content of plants in karst areas can be quickly and quantitatively estimated using spectral index combined with hyperspectral remote sensing data. These results can also provide scientific insights for estimating plants’ growth and their adaptation to environmental stress.
Subjects: Biology >> Botany >> Botany research, experiment, plant evolution & development submitted time 2018-06-25 Cooperative journals: 《广西植物》
Abstract： Ecological floating bed system has been the hotspot of research and application in the comprehensive management of polluted water environment. In order to analyze the effects of its plant diversity and composition on purification of domestic sewage, this study established five species richness levels and two composition arrangements by using Arundo donax as dominant and constructive species, and measured the plant growth, system productivity and N, P, COD removal. The results indicated that the individual biomass and relative growth rate (RGR) of wetland plants (such as A. donax) decreased with increasing species richness, while the survival and growth of mesophytes were promoted. Higher species richness decreased the productivity of the system, but increased significantly the removal of N, P and COD. At the same level of species richness, the composition with more mesophytes had lower system productivity than that with more wetland plant species, but the former had higher N, P and COD removal. Under the same species richness and composition, P removal was highest, N removal was followed, and COD removal was lowest.
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