Abstract
Chlorophyll is the dominant pigment in the photosynthetic light-harvesting complexes that is related to the physiological function of leaves and is responsible for light absorption and energy transfer. Dust pollution has become an environmental problem in many areas in China, indicating that accurately estimating chlorophyll content of vegetation using remote sensing for assessing the vegetation growth status in dusty areas is vital. However, dust deposited on the leaf may affect the chlorophyll content retrieval accuracy. Thus, quantitatively studying the dustfall effect is essential. Using selected vegetation indices (VIs), the medium resolution imaging spectrometer terrestrial chlorophyll index (MTCI), and the double difference index (DD), we studied the retrieval accuracy of chlorophyll content at the leaf scale under dusty environments based on a laboratory experiment and spectra simulation. First, the retrieval accuracy under different dustfall amounts was studied based on a laboratory experiment. Then, the relationship between dustfall amount and fractional dustfall cover (FDC) was experimentally analyzed for spectra simulation of dusty leaves. Based on spectral data simulated using a PROSPECT-based mixture model, the sensitivity of VIs to dust under different chlorophyll contents was analyzed comprehensively, and the MTCI was modified to reduce its sensitivity to dust. The results showed that (1) according to experimental investigation, the DD model provides low retrieval accuracy, the MTCI model is highly accurate when the dustfall amount is less than 80 g/m2, and the retrieval accuracy decreases significantly when the dustfall amount is more than 80 g/m2; (2) a logarithmic relationship exists between FDC and dustfall amount, and the PROSPECT-based mixture model can simulate the leaf spectra under different dustfall amounts and different chlorophyll contents with a root mean square error of 0.015; and (3) according to numerical investigation, MTCI’s sensitivity to dust in the chlorophyll content range of 25 to 60 μg/cm2 is lower than in other chlorophyll content ranges; DD’s sensitivity to dust was generally high throughout the whole chlorophyll content range. These findings may contribute to quantitatively understanding the dustfall effect on the retrieval of chlorophyll content and would help to accurately retrieve chlorophyll content in dusty areas using remote sensing.
Highlights
Since the experiment only provided a finite number of levels of chlorophyll content, a simulation method based on the dustfall amount–coverage relationship and spectra mixture was used to obtain the spectra under continuous chlorophyll contents
Determining Dustfall Effect on Chlorophyll Content Retrieval Accuracy Based on Experiment
In wewe examined the effect of dustfall on chlorophyll content retrieval
Summary
Dust is largely released by industrial and mining enterprises [1,2,3], becoming one of the mainDust is largely by [4,5].industrial mining [1,2,3], becoming one of the main pollutants that affectreleased air qualityDust and aerosols can enterprises affect the climate and biogeochemistry [6,7], pollutants that affect air quality [4,5].Dust aerosols can affect the climate and biogeochemistry [6,7], and pose a risk to human health [8]. Dust is largely released by industrial and mining enterprises [1,2,3], becoming one of the main. Industrial mining [1,2,3], becoming one of the main pollutants that affectreleased air quality. Dust and aerosols can enterprises affect the climate and biogeochemistry [6,7], pollutants that affect air quality [4,5]. Dust aerosols can affect the climate and biogeochemistry [6,7], and pose a risk to human health [8]. In China, dust pollution is serious in some mining areas [9]. Dust pollution is serious in of some [9] for for (Figure 1).health.
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