GESTION FORESTAL SOSTENIBLEInstituto de InvestigaciónUniversidad de Valladolid-INIA

SEMINAR Trends in Silvicultural Research

Influence of light and summer rainfall in germination and early

development of Pinus pinaster Ait.

IRENE RUANO BENITOMartes 24 de noviembre de 2009

INTRODUCTION AND OBJETIVES

Influence of light and summer rainfall in germination and early development of Pinus pinaster Ait.

Why?

INTRODUCTION AND OBJETIVES

Influence of light and summer rainfall in germination and early development of Pinus pinaster Ait.

Key factors of Maritime Pine

TEMPERATURE WATER DISPONIBILITY

LIGHT SIMULATING RAINFALL

MATERIALS AND METHODS

Influence of light and summer rainfall in germination and early development of Pinus pinaster Ait.

MATERIALS AND METHODS

Influence of light and summer rainfall in germination and early development of Pinus pinaster Ait.

Three harvest intensities

0% 25% 50% 100%P10 P2 P6 P1

P4 P7 P3P5 P8 P9

P10 P5 P7 P9

EXPERIMENTAL SITE

MATERIALS AND METHODS

Influence of light and summer rainfall in germination and early development of Pinus pinaster Ait.

1200 seeds in groups of 25

Protect against predators

Experimental unit

APRIL 2006

MATERIALS AND METHODS

Influence of light and summer rainfall in germination and early development of Pinus pinaster Ait.

LIGHT 12 EXPERIMENTAL UNITS PER PLOT OF HARVEST INTENSITY

MATERIALS AND METHODS

Influence of light and summer rainfall in germination and early development of Pinus pinaster Ait.

LIGHT

Hemisferic photographs for light characterization

MAY 2008

MATERIALS AND METHODS

Influence of light and summer rainfall in germination and early development of Pinus pinaster Ait.

WATER DISPONIBILITY SUMMERS 2006 AND 2007

2 litres of water

Every 15 days

MATERIALS AND METHODS

Influence of light and summer rainfall in germination and early development of Pinus pinaster Ait.

DURING 18 MONTHS

MATERIALS AND METHODS

Influence of light and summer rainfall in germination and early development of Pinus pinaster Ait.

Seedling harvest and laboratory proceduresNOVEMBER 2007

MATERIALS AND METHODS

Influence of light and summer rainfall in germination and early development of Pinus pinaster Ait.

Data analysis

17 variables – 4 groups

germinationsurvival of the seeds sownsurvival of the seedlings germinated

dry weightslongitudes

mean dry weightsdry biomass

MIXED LINEAL MODEL

GERMINATION AND SURVIVAL

BIOMETRIC VARIABLES

TOTAL BIOMASS

LEAF AREA

RESULTS

Influence of light and summer rainfall in germination and early development of Pinus pinaster Ait.

variables

Harvest (%) Summer watering

0 25 50 100 Yes+yes Yes+no No+yesNo+n

o

Germination and survival

A B A A ab a b b

Biometric variables

A A AB B b a b -

Total biomass A A A B c a bc ab

Leaf area - - - - - - - -

?

DISCUSSION

Influence of light and summer rainfall in germination and early development of Pinus pinaster Ait.

P SUMMER (MM)

DAYS OF SUMMER

P MAY (mm)DAYS

OF MAY

2006 101.8 27 8.6 7

2007 159 30 107.4 18

NEAR 100 MM OF DIFFERENCE IN 11 DAYS MORE

THE EFECT OF SUMMER RAINFALL

CONCLUSIONS

Influence of light and summer rainfall in germination and early development of Pinus pinaster Ait.

GROWTH AND BIOMASS

water availability has a greater influence than the harvest intensity

further research on water regimen should be carried out

GERMINATION AND SURVIVAL

light higher impact that summer rainfall

better results where 25% of the basal area was removed

THANKS!!!

FOR MORE INFORMATION: Ruano et al. 2009. Forest Ecology and Management 258, 2647–2653