RAINFALL PARTITIONING IN FRAGMENTS OF CERRADO VEGETATION AT DIFFERENT STAGES OF CONDUCTION OF NATURAL REGENERATION

Bessi, Débora; Dias, Herly Carlos Teixeira; Tonello, Kelly Cristina

doi:10.1590/1806-90882018000200015

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Articles • Rev. Árvore 42 (2) • 2018 • https://doi.org/10.1590/1806-90882018000200015 copy

RAINFALL PARTITIONING IN FRAGMENTS OF CERRADO VEGETATION AT DIFFERENT STAGES OF CONDUCTION OF NATURAL REGENERATION

REPARTIÇÃO DE CHUVA EM FRAGMENTOS DE CERRADO SOB DIFERENTES ESTÁGIOS DE CONDUÇÃO DA REGENERAÇÃO NATURAL

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

In order to contribute to the discussion on how forest development interacts with hydrological processes related to rainfall partitioning, we aimed to characterize the rainfall interception (RI), throughfall (Tf), stemflow (Sf), and net precipitation (NP) in three Cerrado areas at different stages of natural regeneration conduction: treatment 1 = area with 4 years without human intervention; treatment 2 = 10 years; and treatment 3 = 43 years. In all areas, three 400-m² plots were established, in each of which 12 rain gauges and stemflow collectors were installed on all trees having Diameter at Breast High (DBH) > 5 cm. Data was recorded from December 2015 through November 2016. At treatment 1, Tf corresponded to 100% of gross precipitation (GP) in the micro-basin, while Sf corresponded to 0.01%, RI to 0%, and NP to 100% of GP. At treatment 2, Tf corresponded to 96% of GP, whereas Sf corresponded to 0.19%, RI to 4%, and NP to 96% of GP. At treatment 3, Tf corresponded to 87% of GP, while Sf corresponded to 1.15%, RI to 12%, and NP to 88%. The results revealed significant differences among the study areas. Both RI and Sf increased with advancing natural regeneration, while Tf and NP decreased. Data varied according to vegetation features, like the number and density of individuals and species in each plot, and according to characteristics related to weather and precipitation in the area.

Keywords:
Throughfall; Stemflow; Rainfall interception

Sociedade de Investigações Florestais Universidade Federal de Viçosa, CEP: 36570-900 - Viçosa - Minas Gerais - Brazil, Tel: (55 31) 3612-3959 - Viçosa - MG - Brazil
E-mail: rarvore@sif.org.br

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[1] *Corresponding author.

		GP		Tf		Sf		NP		RI
		mm	%	mm	%	mm	%	mm	%	mm	%
Treatment 1	Dec.	71	100	70	99	0.004	0.01	70.3	99	1.0	1
	Jan.	363	100	371	102	0.061	0.02	370.8	102	-7.8	-2
	Feb.	200	100	199	100	0.029	0.01	199.1	100	0.9	0
	Mar.	170	100	168	99	0.016	0.01	167.9	99	1.8	1
	Apr.	0	-	0	-	0.000	-	0.0	-	0.0	-
	May	139	100	139	100	0.015	0.01	139.3	100	0.0	0
	Jun.	112	100	112	99	0.026	0.02	111.5	99	0.6	1
	Jul.	3	100	3	100	0.000	0.00	3.0	93	0.2	7
	Aug.	28	100	27	98	0.003	0.01	27.5	98	0.5	2
	Sep.	19	100	19	99	0.003	0.01	19.0	99	0.1	1
	Oct.	132	100	130	98	0.013	0.01	130.1	98	2.4	2
	Nov.	102	100	102	100	0.011	0.01	101.6	100	0.3	0
	Total	1340	100	1340	100	0.180	0.01	1340.1	100	0	0
		GP		Tf		Sf		NP		RI
		mm	%	mm	%	mm	%	mm	%	mm	%
Treatment 2	Dec.	71	100	66	92	0.043	0.06	65.7	92	5.7	8
	Jan.	363	100	369	102	0.765	0.21	370.2	102	-7.1	-2
	Feb.	200	100	199	99	0.431	0.22	199.0	100	1.0	0
	Mar.	170	100	159	94	0.217	0.13	159.5	94	10.3	6
	Apr.	0	-	0	-	0.000	-	0.0	-	0.0	-
	May.	139	100	121	87	0.274	0.20	121.2	87	17.7	13
	Jun.	112	100	98	⁸00	0.267	0.24	98.7	⁸00	13.4	12
	Jul.	3	100	3	87	0.001	0.03	2.8	87	0.4	13
	Aug.	28	100	26	92	0.063	0.23	25.7	92	2.3	8
	Sep.	19	100	19	100	0.042	0.22	19.1	100	0.0	0
	Oct.	132	100	127	96	0.271	0.20	127.3	96	5.2	4
	Nov.	102	100	98	96	0.235	0.23	97.7	96	4.2	4
	Total	1340	100	1284	96	2.610	0.19	1286.9	96	52.9	4
		GP		Tf		Sf		NP		RI
		mm	%	mm	%	mm	%	mm	%	mm	%
Treatment 2	Dec.	71	100	50	70	0.407	0.57	50.6	71	20.8	29
	Jan.	363	100	345	95	4.081	1.12	349.3	96	13.8	4
	Feb.	200	100	181	90	2.049	1.02	182.5	91	17.5	9
	Mar.	170	100	130	77	2.165	1.28	132.5	78	37.3	22
	Apr.	0	-	0	-	0.000	-	0.0	-	0.0	-
	May.	139	100	111	80	1.603	1.15	112.4	81	26.5	19
	Jun.	112	100	96	86	1.653	1.47	97.9	87	14.2	13
	Jul.	3	100	2	68	0.008	0.24	2.2	68	1.0	32
	Aug.	28	100	21	75	0.340	1.21	21.4	76	6.6	24
	Sep.	19	100	17	87	0.306	1.60	17.0	89	2.1	11
	Oct.	132	100	115	87	1.294	0.98	115.9	88	16.5	12
	Nov.	102	100	100	98	1.456	1.43	101.4	99	0.6	1
	Total	1340	100	1168	87	15.361	1.15	1183.0	⁸00	156.8	12

Test for equal means, adjusted for covariate Throughfall (Tf)
	Sum of sqrs	df	Mean square	F	p (same)
Adj. Means	325.52	1.00	325.52	12.04	0.0013
Adj. Error	1054.06	39.00	27.03
Adj. Total	1379.57	40.00
Homogeneity (equality) of slopes
F	1.05
p (same)	0.3113
Test for equal means, adjusted for covariate Stemflow (Sf)
Sum of sqrs	df	Mean square	F	p (same)
Adj. Mean	335.85	1.00	335.85	12.87	0.0010
Adj. Error	965.87	37.00	0.26
Adj. Total	130.17	38.00
Homogeneity (equality) of slopes
F	395.70
p (same)	0.0000
Test for equal means, adjusted for covariate Net Precipitation (NP)
	Sum of sqrs	df	Mean square	F	p (same)
Adj. Mean	257.76	1.00	257.76	9.50	0.0038
Adj. Error	1058.73	39.00	271.47
Adj. Total	1316.49	40.00
Homogeneity (equality) of slopes
F	0.50
p (same)	0.4839
Test for equal means, adjusted for covariate Rainfall Interception (RI)
	Sum of sqrs	df	Mean square	F	p (same)
Adj. Mean	372.82	1.00	372.82	18.94	0.0001
Adj. Error	649.52	33.00	196.82
Adj. Total	1022.33	34.00
Homogeneity (equality) of slopes
F	60.89
p (same)	0.0000