Does a leaf absorb radiation in the near infrared (780–900 nm) region? A new approach to quantifying optical reflection, absorption and transmission of leaves
Tóm tắt
The following question is addressed here: do healthy leaves absorb, as the spectra published over the last 50 years indicate, some 5–20% of incident radiation in the 780–900 nm region? The answer is found to be negative, and previous findings result from incomplete collection of the transmitted light by the detection system (even when the leaf is placed next to, but outside, the entrance port of an integrating sphere). A simple remedy for this inherent flaw in the experimental arrangement is applied successfully to leaves (of 10 unrelated species) differing in thickness, age and pigment content. The study has shown that, from an optical standpoint, a leaf tissue is a highly scattering material, and the infinite reflectance of a leaf is exceedingly sensitive to trace amounts of absorbing components. It is shown that water contributes, in a thick leaf (Kalanchoe blossfeldiana), an easily detectable signal even in the 780–900 nm region. The practical benefits resulting from improved measurements of leaf spectra are pointed out.
Tài liệu tham khảo
Allen WA and Richardson AJ (1968) Interaction of light with a plant canopy. J Opt Soc Am 58: 1023-1028
Baldini E, Facini O, Nerozzi F, Rossi F and Rotondi A (1997) Leaf characteristics and optical properties of different woody species. Trees 12: 73-81
Carter GA (1991) Primary and secondary effects of water content on the spectral reflectance of leaves. Am J Bot 78: 916-92.
Curcio JA and Petty CC (1951) The near infrared spectrum of liquid water. J Opt Soc Am 41: 302-304
Davisson B (1957) Neutron Transport Theory. Clarendon Press, Oxford.
Gates DM, Keegan HJ, Schleter JC and Weidner VR (1965) Spectral properties of plants. Appl Opt 4: 11-20
Gausman HW and Allen WA (1973) Optical parameters of leaves of 30 plant species. Plant Physiol 52: 57-62
Gausman HW, Rodrigues RR and Richardson AJ (1976) Infinite reflectance of dead compared with live vegetation. Agron J 68: 295-296
Gitelson AA and Merzlyak MN (1996) Signature analysis of leaf reflectance spectra: algorithm development for remote sensing of chlorophyll. J Plant Physiol 148: 494-500
Gitelson AA, Kaufman YJ and Merzlyak MN (1996) Use of a green channel in remote sensing of global vegetation from EOS-MODIS. Rem Sens Environ 58: 289-298
Gitelson AA, Merzlyak MN and Chivkunova OB (2001) Optical properties and non-destructive estimation of anthocyanin content in plant leaves. Photochem Photobiol 74: 38-45
Gitelson AA, Kaufman YJ, Stark R and Rundquist D (2002) Novel algorithms for remote estimation of vegetation fraction. Rem Sens Environ 80: 76-87
Hageman R (1981) Regulation and transcription in the chloroplasts. In: Akoyunoglou G (ed) Photosynthesis V. Chloroplast Development, pp 755-766. Balaban, Philadelphia
Hanssen LM (1989) Effects of restricting of the detector field of view when using integrating spheres. Appl Opt 28: 2097-2103
Knapp AK and Carter GA (1998) Variability in leaf optical properties among 26 species from a broad range of habitats. Am J Bot 85: 940-946
Kortüm G (1969) Reflectance Spectroscopy. Principles, Methods, Applications. Springer Verlag, Berlin, Heidelberg/New York
Kubelka P and Munk F (1931) Ein Beitrag zur Optic der Farbanstriche. Z Techn Physik 12: 593-601
Lee DW and Graham R (1986) Leaf optical properties of rainforest sun and extreme shade plants. Am J Bot 73: 1100-1108
Maas SJ and Dunlop JR (1989) Reflectance, transmittance, and absorptance of light by normal, etiolated and albino corn leaves. Agron J 81: 105-110
Matile P, Flach, BM-P and Eller BM (1992) Autumn leaves of Ginkgo bioba L.: optical properties, pigments and optical brighteners. Bot Acta 105: 13-17
Myneni RB, Hall FG, Sellers PJ and Marshak AL (1995) The interpretation of spectral vegetation indexes. IEEE Trans Geosci Rem Sens 33: 481-486
Merzlyak MN, Gitelson AA, Pogosyan SI, Chivkunova OB, Lekhimena L, Garson M, Buzulukova NI, Shevyryova VV and Rumyantseva VB (1997) Reflectance spectra of plant leaves and fruits during their development, senescence and under stress. Rus J Plant Physiol 44: 614-622
Myneni RB, Nemani RR and Running SW (1997) Estimation of global leaf area index and absorbed par using radiative transfer models. IEEE Trans Geosci Rem Sens 35: 1380-1393
Nostell P, Roos A and Rönnow D (1999) Single-beam integrating sphere spectrometer for reflectance and transmittance measurements versus angle of incidence in the solar wavelength range on diffuse and specular samples. Rev Sci Instrum 70: 2481-2494
Osborne BA and Raven JA (1986) Light absorption by plants and its implication for photosynthesis. Biol Rev 61: 1-61
Roberts DA, Nelson BV, Adams JB and Palmer F (1998) Spectral changes with leaf aging in Amazon caatinga. Trees 12: 315-325
Seyfried M, Fukshansky L and Schäfer E (1983) Correcting remission and transmission spectra of plant tissue measured in glass cuvettes: a technique. Appl Opt 22: 492-496
Tanner V and Eller BM (1986) Veränderungen der spektralen Eigenschaften der Blätter der Buche (Fagus silvatica L.) von Laubaustrieb bis Laubfall. Allg Forst-u J-Ztg 157: 108-117
Thucker CJ (1980) Remote sensing of leaf water content in the near infra-red. Rem Sens Environ 10: 23-32
Wendlandt WW and Hecht HG (1966) Reflectance Spectroscopy. Interscience, New York
Wolken JJ (1975) Photoprocesses, Photoreceptors and Evolution. Academic Press, New York, p 21
Woolley JT (1971) Reflectance and transmittance of light by leaves. Plant Physiol 47: 656-662