Optical characteristics of individual plant elements and plant canopies grown under radiation regimes of different spectral composition and intensity

A. A. Tikhomirov; F. Ya. Sidko

doi:10.1364/AO.22.002874

Applied Optics
Vol. 22,
Issue 18,
pp. 2874-2881
(1983)
•https://doi.org/10.1364/AO.22.002874

Optical characteristics of individual plant elements and plant canopies grown under radiation regimes of different spectral composition and intensity

A. A. Tikhomirov and F. Ya. Sidko

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A. A. Tikhomirov and F. Ya. Sidko, "Optical characteristics of individual plant elements and plant canopies grown under radiation regimes of different spectral composition and intensity," Appl. Opt. 22, 2874-2881 (1983)

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Abstract

The character of the interaction of radiation with the elements of plant canopies determines the light conditions for their photosynthesis and hence for the formation of the final yield. Investigation of the dependence of the optical properties of canopies on the irradiation conditions makes it necessary to know the variability of the optical properties of both individual phytoelements and whole canopies. If the distribution of radiation within a canopy and the character of transformation of the spectral composition of the radiation penetrating the canopy are known, the efficiency of assimilation of radiant energy can be more accurately estimated. Obtaining such information may be helpful in selecting optimum radiation conditions for canopies of a different structure. This paper examines certain optical characteristics of canopies having different optical densities and their individual phytoelements as well as several characteristics of the radiation field in canopies during their prolonged growth while illuminated with radiant fluxes of different intensities and spectral compositions of photosynthetically active radiation.

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Portion of stem in relation to its height H	Age (days)	400–500 nm		500–600 nm		600–700 nm

		E₁	E₂	E₁	E₂	E₁	E₂
0–1/3 H	40	88	89	77	72	78	78
	50	90	91	73	73	83	78
	60	89	86	71	72	84	78
	70	—	84	69	66	84	72
1/3–2/3 H	40	89	89	84	79	87	80
	50	89	85	83	79	86	80
	60	90	84	81	78	81	83
	70	—	79	80	76	84	79
2/3–1H	40	93	92	82	88	90	84
	50	92	92	85	87	89	84
	60	86	85	86	84	88	86
	70	—	75	86	83	88	78
Ear	40	88	86	72	70	78	70
	50	87	85	71	69	75	56
	60	85	83	67	68	73	54
	70	—	81	63	65	72	47

	400–500 nm			500–600 nm			600–700 nm

E₀	T (%)	R (%)	A (%)	T (%)	R (%)	A (%)	T (%)	R (%)	A (%)
100	9	5.6	85.4	16	11	73	7.5	4.5	88
200	a	a	a	21	8.0	71	14	7.5	79
300	5	5	90	30	25	45	26	21	53
400	4	4	92	b	b	b	b	b	b
500	13	15	72	b	b	b	b	b	b

Portion of stem in relation to its height H	Age (days)	400–500 nm		500–600 nm		600–700 nm

		E₁	E₂	E₁	E₂	E₁	E₂
0–1/3 H	40	88	89	77	72	78	78
	50	90	91	73	73	83	78
	60	89	86	71	72	84	78
	70	—	84	69	66	84	72
1/3–2/3 H	40	89	89	84	79	87	80
	50	89	85	83	79	86	80
	60	90	84	81	78	81	83
	70	—	79	80	76	84	79
2/3–1H	40	93	92	82	88	90	84
	50	92	92	85	87	89	84
	60	86	85	86	84	88	86
	70	—	75	86	83	88	78
Ear	40	88	86	72	70	78	70
	50	87	85	71	69	75	56
	60	85	83	67	68	73	54
	70	—	81	63	65	72	47

	400–500 nm			500–600 nm			600–700 nm

E₀	T (%)	R (%)	A (%)	T (%)	R (%)	A (%)	T (%)	R (%)	A (%)
100	9	5.6	85.4	16	11	73	7.5	4.5	88
200	a	a	a	21	8.0	71	14	7.5	79
300	5	5	90	30	25	45	26	21	53
400	4	4	92	b	b	b	b	b	b
500	13	15	72	b	b	b	b	b	b

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Equations (4)

Applied Optics