Popa Et All Final
2
Drought Effects on Forest Health and Growth in the Western Part of the Eurasian Steppe Region Ionel POPA, Ovidiu BADEA, Stefan NEAGU, Sefan LECA, Constantin NECHITA Forest Research and Management Institute-Romania (ICAS) Bd. Eroilor 128, 077190 Voluntari, jud. Ilfov, Romania, [email protected], www.icas.ro Introduction Material and Methods Results Conclusions Acknowledgments Regional warming and consequent higher water deficits along with air pollution are, most likely, the main driving forces behind forest health and growth dynamics. They are more important in the case of forest ecosystems existing under marginal or restricted ecological conditions such in south and south-eastern part of Romania (western part of Eurasian steppe). The objective is to investigate the climate influence on forest health and tree growth on south and south- eastern part of Romania. Data sets: defoliation data from the period 1992-2013 (share of damaged trees – defoliation classes 2-4) and climate data from E-OBS grid database. Tree ring chronologies for Quercus species analyzed by dendrochronological methods. Forest health dynamics 0 10 20 30 40 50 60 70 80 90 1990 1995 2000 2005 2010 2015 % o f d a m a g e t r e e s Year Allspecies ECS C SM A 0 10 20 30 40 50 60 70 80 90 1990 1995 2000 2005 2010 2015 % o f d a m a g e t r e e s Year Broadleaves ECS C SM A 0 10 20 30 40 50 60 70 80 90 1990 1995 2000 2005 2010 2015 % d a m a g e t r e e s Year Quercusspp. ECS C SM A Biogeographic region of Romania (adapted from EEA) – ICP Level I network Dynamics of share of damaged trees by regions Species located in the southern and south-eastern Romania under extreme continental and steppe climate (e.g. oak species and black locust) are the most affected (22-43% share of damaged trees) comparing with beech (11%) and spruce (9%) situated on sub- mountain and alpine region. IUFRO, Salt Lake City, USA, 6-11 of October, 2014 The share of damaged trees reached the highest values in 1994, after a prolonged period of drought since 1981. After 1996 a slow increase of trees health is observed. This trend is more evident after 2001 due to a important increase of precipitation amount in the regions with hot and dry climate (ESC) and continental climate (C). Climate influence on forest health -0.15 -0.10 -0.05 0.00 0.05 pA_pA pS_pN pD_M A_A pS_A C o r r . K e n d a l l Season Nationallevel Allspec ies Broa dlea ves Coni fers Pice aa. Fagu ss. Quer cusspp. -0.2 -0.1 0.0 0.1 pA_pA pS_p N pD _ M A_A pS_A C o r r . K e n d a l l Season Allspecies ECS C SM A -0.3 -0.2 -0.1 0.0 0.1 0.2 pA_pA pS_pN pD_ M A_A pS_A C o r r . K e n d a l l Season Broadleaves ECS C SM A -0.3 -0.2 -0.1 0.0 0.1 pA_p A pS_pN pD_ M A_A pS_A C o r r . K e n d a l l Season Quercusspp. ECS C SM A Kendall’s tau correlation between the share of damaged trees and precipitation at national and regional level 0.00 0.05 0.10 0.15 0.20 0.25 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2003 2004 2005 2006 200 7 2009 2010 2011 2012 2013 P a r t i a l R 2 Year All species p_A _A p_p D_M p_p S_p N p_p A_p A t_A _A t_p D_M t_p S_p N t_p A_p A 0.00 0.05 0.10 0.15 0.20 0.25 0.30 1992 1993 199 4 1995 1996 1997 1998 1999 2000 2001 2003 2004 2005 2006 2007 2009 2010 2011 201 2 2013 P a r t i a l R 2 Year Broadleaves Multiple linear regression analysis between share of damaged trees and seasonal temperature and precipitation 0.00 0.10 0.20 0.30 0.40 0.50 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2003 2004 2005 2006 2007 2009 2010 2011 2012 2013 P a r t i a l R 2 Year Quercusspp. Climate influence on share of damage trees is relatively low (r =0. 1-0. 2 at national level and r = 0.2 -0. 3 at r egio nal l evel max max mainly of south and south-eastern Romania). Generally, precipitation is the main climatic driver on tree defoliation, a negative correlation has been observed for main species/group of species. High variability of the correlation among biogeographic regions was revealed. Variance of defoliation explained by climate decreased in the last years for all species and broadleaves. For oak species the variance explained by climate remain over 20% duri ng the analyzed period. Climate influence on tree growth -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 pS pO pN p D I F M A M I I A C o r r e l a t i o n c o e f . Month Quercusrobur PLOA STFA -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 0.5 pS pO p N pD I F M A M I I A C o r r e l a t i o n c o e f . Month Quercus cerris GIRA VIDA VIDB The growth of oak species from south o f Romania is limited by the precipitation amount from current growing season. The intensity of monthly correlations varies between species. The analysis of the spatial correlation between tree ring index and seasonal precipitation allowed to establish the representativeness of each site. Drought represent the main driving factor for forest health and tree growth in the south and south-east of Romania (western part of Eurasian steppe). Significant improvement of forest health from the south and south-east of Romania was observed in the last years linked to a improvement of water balance. These forests are the only line of defense against the Eurasian steppe expansion. This research was supported by Romanian Authority for Research in Core Program for forestry – GEDEFOR - project PN09460110. 0 5 10 15 20 25 30 35 40 45 50 Q u e r c u s f r a i n e t t o Q u e r c u s p u b e s c e n s R o b i n i a p s e u d o a c a c i a Q u e r c u s c e r r i s Q u e r c u s r o b u r Q u e r c u s p e t r a e a F a g u s s y l v a t i c a P i c e a a b i e s % o f d a m a g e d t r e e s Dynamics of share of damaged trees at national level (4x4 km) Correlation between tree ring index and precipitation from south Romania These forests are the only line of defense against the Eurasian steppe expansion These forests are the only line of defense against the Eurasian steppe expansion
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Transcript of Popa Et All Final
8/9/2019 Popa Et All Final
http://slidepdf.com/reader/full/popa-et-all-final 1/1
Drought Effects on Forest Health and Growth in the Western Partof the Eurasian Steppe Region
Ionel POPA, Ovidiu BADEA, Stefan NEAGU, Sefan LECA, Constantin NECHITAForest Research and Management Institute-Romania (ICAS)Bd. Eroilor 128, 077190 Voluntari, jud. Ilfov, Romania, [email protected], www.icas.ro
Introduction
Material and Methods
Results
Conclusions
Acknowledgments
Regional warming and consequent higher water deficits
along with air pollution are, most likely, the main drivingforces behind forest health and growth dynamics. They aremore important in the case of forest ecosystems existingunder marginal or restricted ecological conditions such insouth and south-eastern part of Romania (western part ofEurasian steppe).
The objective is to investigate the climate influence on
forest health and tree growth on south and south- easternpart of Romania.
Data sets: defoliation data from the period 1992-2013 (share
of damaged trees – defoliation classes 2-4) and climate datafrom E-OBS grid database. Tree ring chronologies forQuercus species analyzed by dendrochronological methods.
Forest health dynamics
0
10
20
30
40
50
60
70
80
90
1990 1995 2000 2005 2010 2015
% o f d a m a g e t r e e s
Year
Allspecies ECS C SM A
0
10
20
30
40
50
60
70
80
90
1990 1995 2000 2005 2010 2015
% o f d a m a g e t r e e
s
Year
Broadleaves ECS C SM A
0
10
20
30
40
50
60
70
80
90
1990 1995 2000 2005 2010 2015
% d a m a g e t r e e s
Year
Quercusspp. ECS C SM A
Biogeographic region of Romania (adapted from EEA) – ICP Level I network
Dynamics of share of damaged trees by regions
Species located in the southern and south-eastern Romania under
extreme continental and steppe climate (e.g. oak species and blacklocust) are the most affected (22-43% share of damaged trees)comparing with beech (11%) and spruce (9%) situated on sub-mountain and alpine region.
IUFRO, Salt Lake City, USA, 6-11 of October, 2014
The share of damaged trees reached the highest values in
1994, after a prolonged period of drought since 1981. After1996 a slow increase of trees health is observed. This trend ismore evident after 2001 due to a important increase of
precipitation amount in the regions with hot and dry climate(ESC) and continental climate (C).
Climate influence on forest health
-0.15
-0.10
-0.05
0.00
0.05
pA_pA pS_pN pD_M A_A pS_A
C o r r . K e n d a l l
Season
Nationallevel
Allspecies Broadleaves Conifers Piceaa. Faguss. Quercusspp.
-0.2
-0.1
0.0
0.1
pA_pA pS_ pN pD _M A_ A pS_A
C o r r . K e n d a l l
Season
Allspecies ECS C SM A
-0.3
-0.2
-0.1
0.0
0.1
0.2
pA_pA pS_pN pD _M A_ A pS_ A
C o r r . K e n d a l l
Season
Broadleaves E CS C S M A
-0.3
-0.2
-0.1
0.0
0.1
pA_ pA pS_pN pD _M A_A pS_A
C o r r . K e n d a l l
Season
Quercusspp. ECS C
SM A
Kendall’s tau correlation between the share of damaged trees andprecipitation at national and regional level
0.00
0.05
0.10
0.15
0.20
0.25
1 99 2 1 99 3 1 99 4 1 9 95 1 99 6 1 99 7 1 99 8 1 99 9 2 00 0 2 00 1 2 00 3 2 00 4 2 00 5 2 00 6 2 0 07 2 00 9 2 01 0 2 01 1 2 01 2 2 01 3
P a r t i a l R 2
Year
All species p _A_A p _pD _M p _pS _pN p _pA_pA t _A_A t _pD _M t _pS _pN t _pA_pA
0.00
0.05
0.10
0.15
0.20
0.25
0.30
1 99 2 1 99 3 1 9 94 1 99 5 1 99 6 1 99 7 1 99 8 1 99 9 2 00 0 2 00 1 2 00 3 2 00 4 2 00 5 2 00 6 2 00 7 2 00 9 2 01 0 2 01 1 2 0 12 2 01 3
P a r t i a l R 2
Year
Broadleaves
Multiple linear regression analysis between share of damaged trees andseasonal temperature and precipitation
0.00
0.10
0.20
0.30
0.40
0.50
1 99 2 1 99 3 1 99 4 1 99 5 1 99 6 1 99 7 1 99 8 1 99 9 2 00 0 2 00 1 2 00 3 2 00 4 2 00 5 2 00 6 2 00 7 2 00 9 2 01 0 2 01 1 2 01 2 2 01 3
P a r t i a l R 2
Year
Quercus spp.
Climate influence on share of damage trees is relatively low(r =0.1-0.2 at national level and r = 0.2-0.3 at regional level max max
mainly of south and south-eastern Romania). Generally,precipitation is the main climatic driver on tree defoliation, anegative correlation has been observed for mainspecies/group of species. High variability of the correlationamong biogeographic regions was revealed.
Variance of defoliation explained by climate decreased in the
last years for all species and broadleaves. For oak speciesthe variance explained by climate remain over 20% during theanalyzed period.
Climate influence on tree growth
-0.2
-0.1
0.0
0.1
0.2
0.3
0.4
pS pO pN pD I F M A M I I A
C o r r e l a t i o n c o e f .
Month
Quercusrobur P LO A S TF A
-0.3
-0.2
-0.1
0.0
0.1
0.2
0.3
0.4
0.5
pS pO pN pD I F M A M I I A
C o r r e l a t i o n c o e f .
Month
Quercus cerris G I RA V I DA V I DB
The growth of oak species from south of Romania is limited
by the precipitation amount from current growing season.The intensity of monthly correlations varies betweenspecies. The analysis of the spatial correlation between treering index and seasonal precipitation allowed to establish
the representativeness of each site.
Drought represent the main driving factor for forest health
and tree growth in the south and south-east of Romania(western part of Eurasian steppe).
Significant improvement of forest health from the south and
south-east of Romania was observed in the last years linkedto a improvement of water balance.
These forests are the only line of defense against the
Eurasian steppe expansion.
This research was supported by Romanian Authority forResearch in Core Program for forestry – GEDEFOR - projectPN09460110.
0
5
10
15
20
25
30
35
40
45
50
Q u e r c u s f r a i n e t t o
Q u e r c u s p u b e s c e n s
R o b i n i a
p s e u d o a c a c i a
Q u e r c u s c e r r i s
Q u e r c u s r o b u r
Q u
e r c u s p e t r a e a
F a g u s s y l v a t i c a
P i c e a a b i e s
% o f d a m a g e d t r e e s
Dynamics of share of damaged trees at national level (4x4 km)
Correlation between tree ring index and precipitation from south Romania
These forests are the only line of defense against the Eurasian steppe expansionThese forests are the only line of defense against the Eurasian steppe expansion
