Water and Radiation Use Efficiencies by Erythrina velutina and Enterolobium contortisiliquum Under Different Water Conditions

Araújo, Yara Panta de; Souza, Luciana Sandra Bastos de; Silva, Thieres George Freire da; Moura, Magna Soelma Beserra de

doi:10.1590/2179-8087-FLORAM-2019-0080

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ORIGINAL ARTICLE, Conservation of Nature • Floresta Ambient. 28 (1) • 2021 • https://doi.org/10.1590/2179-8087-FLORAM-2019-0080 copy

Water and Radiation Use Efficiencies by Erythrina velutina and Enterolobium contortisiliquum Under Different Water Conditions

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

This study investigated the water and radiation use efficiencies by Erythrina velutina and Enterolobium contortisiliquum under four water regimes. The experiment was carried out in the municipality of Serra Talhada, PE, Brazil. The experimental design was completely randomized with a 2 x 4 factorial arrangement and three replications. The water regimes were imposed from water replenishments based on the reference evapotranspiration (25, 50, 75 and 100% ET0). Water and radiation use efficiencies were calculated to the 120 days of growth. E. velutina showed a greater accumulated dry biomass (4.89 g pl^-1) than E. contortisiliquum (2.22 g pl^-1). The 75% ET0 water regime can be adopted without damage to the growth of both species. E. velutina was more efficient in the conversion of water (0.42 g l^-1) and radiation in dry biomass (0.028 g MJ^-1), indicating high environmental resilience, which is important features to choose species more adequate for reforestation activities.

Keywords:
Caatinga; radiation use efficiency; water use efficiency

Depths	ρs	ρp	Φt	Total sand	Silt	Clay
cm	kg dm^-3		%		g kg^-1
0 - 20	1.30	2.5	48.3	815.2	128.4	56.4
20 - 40	1.32	2.5	47.9	828.5	134.3	37.1

Source of variation	Variables	SS	MS	F	P
Species	DLB	2.13	2.13	16.49	0.000909^**
	SDB	56.25	56.25	145.15	0.000000^**
	RDB	0.25	0.25	2.99	0.103253^ns
	APDB	36.48	36.48	72.07	0.000000^**
	TDB	42.80	42.80	83.15	0.000000^**
	DLB/TDB	0.96	0.96	148.27	0.000000^**
	SDB/TDB	1.32	1.33	339.05	0.000000^**
	RDB/TDB	0.03	0.030	3.93	0.064485^ns
	WUE	0.34	0.334	112.96	0.000000^**
Blade	DLB	2.17	0.72	5.60	0.008063^**
	SDB	7.74	2.8	6.66	0.003975^**
	RDB	1.35	0.45	5.32	0.009735^ns
	APDB	17.35	5.78	11.41	0.000299^**
	TDB	28.23	9.41	18.28	0.000020^**
	DLB/TDB	28.23	9.41	18.28	0.000020^**
	BSC/TDB	0.02	0.01	2.00	0.154364^ns
	BSR/TDB	0.01	0.004	0.60	0.0622404^ns
	WUE	0.03	0.009	3.09	0.056703^ns
Blade X Species	DLB	0.24	0.78	0.60	0.622544^ns
	SDB	2.85	0.95	2.45	0.100892^ns
	RDB	0.90	0.30	3.57	0.037761^ns
	APDB	2.61	2.87	1.72	0.202797^ns
	TDB	1.42	0.47	0.92	0.452897^ns
	DLB/TDB	0.47	0.01	2.43	0.102888^ns
	SDB/TDB	0.01	0.004	1.19	0.343176^ns
	RDB/TDB	0.07	0.024	3.24	0.050121^ns
	WUE	0.01	0.003	1.26	0.320732^ns

Instituto de Florestas da Universidade Federal Rural do Rio de Janeiro Rodovia BR 465 Km 7, CEP 23897-000, Tel.: (21) 2682 0558 | (21) 3787-4033 - Seropédica - RJ - Brazil
E-mail: floram@ufrrj.br

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[1] CORRESPONDENCE TO Thieres George Freire da Silva Universidade Federal Rural de Pernambuco (UFRPE), Avenida Gregório Ferraz Nogueira, S/N, Bairro José Tomé de Souza Ramos, CEP 56.909-535, Serra Talhada, PE, Brasil. E-mail: thieres_freire@yahoo.com.br