Increase in water-use efficiency and underlying processes in pine forests across a precipitation gradient in the dry Mediterranean region over the past 30 years

Kadmiel Maseyk, Debbie Hemming, Alon Angert, Steven Leavitt, Dan Yakir

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

Motivated by persistent predictions of warming and drying in the entire Mediterranean and other regions, we have examined the interactions of intrinsic water-use efficiency (W i) with environmental conditions in Pinus halepensis. We used 30-year (1974-2003) tree-ring records of basal area increment (BAI) and cellulose 13C and 18O composition, complemented by short-term physiological measurements, from three sites across a precipitation (P) gradient (280-700 mm) in Israel. The results show a clear trend of increasing W i in both the earlywood (EW) and latewood (LW) that varied in magnitude depending on site and season, with the increase ranging from ca. 5 to 20% over the study period. These W i trends were better correlated with the increase in atmospheric CO 2 concentration, C a, than with the local increase in temperature (~0.04°C year -1), whereas age, height and density variations had minor effects on the long-term isotope record. There were no trends in P over time, but W i from EW and BAI were dependent on the interannual variations in P. From reconstructed C i values, we demonstrate that contrasting gas-exchange responses at opposing ends of the hydrologic gradient underlie the variation in W i sensitivity to C a between sites and seasons. Under the mild water limitations typical of the main seasonal growth period, regulation was directed at increasing C i/C a towards a homeostatic set-point observed at the most mesic site, with a decrease in the W i response to C i with increasing aridity. With more extreme drought stress, as seen in the late season at the drier sites, the response was W i driven, and there was an increase in the W i sensitivity to C a with aridity and a decreasing sensitivity of C i to C a. The apparent C a-driven increases in W i can help to identify the adjustments to drying conditions that forest ecosystems can make in the face of predicted atmospheric change.

Original languageEnglish (US)
Pages (from-to)573-585
Number of pages13
JournalOecologia
Volume167
Issue number2
DOIs
StatePublished - Oct 2011

Fingerprint

water use efficiency
Mediterranean region
coniferous forests
earlywood
dry environmental conditions
aridity
basal area
drying
seasonal growth
Pinus halepensis
latewood
drought stress
growth rings
gas exchange
tree ring
forest ecosystems
Israel
forest ecosystem
annual variation
cellulose

Keywords

  • Aleppo pine
  • CO fertilization
  • Dryland productivity
  • Isotope dendrology
  • Stomatal conductance

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

Cite this

Increase in water-use efficiency and underlying processes in pine forests across a precipitation gradient in the dry Mediterranean region over the past 30 years. / Maseyk, Kadmiel; Hemming, Debbie; Angert, Alon; Leavitt, Steven; Yakir, Dan.

In: Oecologia, Vol. 167, No. 2, 10.2011, p. 573-585.

Research output: Contribution to journalArticle

@article{2c285f4d28434c0c8287d407ed934f37,
title = "Increase in water-use efficiency and underlying processes in pine forests across a precipitation gradient in the dry Mediterranean region over the past 30 years",
abstract = "Motivated by persistent predictions of warming and drying in the entire Mediterranean and other regions, we have examined the interactions of intrinsic water-use efficiency (W i) with environmental conditions in Pinus halepensis. We used 30-year (1974-2003) tree-ring records of basal area increment (BAI) and cellulose 13C and 18O composition, complemented by short-term physiological measurements, from three sites across a precipitation (P) gradient (280-700 mm) in Israel. The results show a clear trend of increasing W i in both the earlywood (EW) and latewood (LW) that varied in magnitude depending on site and season, with the increase ranging from ca. 5 to 20{\%} over the study period. These W i trends were better correlated with the increase in atmospheric CO 2 concentration, C a, than with the local increase in temperature (~0.04°C year -1), whereas age, height and density variations had minor effects on the long-term isotope record. There were no trends in P over time, but W i from EW and BAI were dependent on the interannual variations in P. From reconstructed C i values, we demonstrate that contrasting gas-exchange responses at opposing ends of the hydrologic gradient underlie the variation in W i sensitivity to C a between sites and seasons. Under the mild water limitations typical of the main seasonal growth period, regulation was directed at increasing C i/C a towards a homeostatic set-point observed at the most mesic site, with a decrease in the W i response to C i with increasing aridity. With more extreme drought stress, as seen in the late season at the drier sites, the response was W i driven, and there was an increase in the W i sensitivity to C a with aridity and a decreasing sensitivity of C i to C a. The apparent C a-driven increases in W i can help to identify the adjustments to drying conditions that forest ecosystems can make in the face of predicted atmospheric change.",
keywords = "Aleppo pine, CO fertilization, Dryland productivity, Isotope dendrology, Stomatal conductance",
author = "Kadmiel Maseyk and Debbie Hemming and Alon Angert and Steven Leavitt and Dan Yakir",
year = "2011",
month = "10",
doi = "10.1007/s00442-011-2010-4",
language = "English (US)",
volume = "167",
pages = "573--585",
journal = "Oecologia",
issn = "0029-8549",
publisher = "Springer Verlag",
number = "2",

}

TY - JOUR

T1 - Increase in water-use efficiency and underlying processes in pine forests across a precipitation gradient in the dry Mediterranean region over the past 30 years

AU - Maseyk, Kadmiel

AU - Hemming, Debbie

AU - Angert, Alon

AU - Leavitt, Steven

AU - Yakir, Dan

PY - 2011/10

Y1 - 2011/10

N2 - Motivated by persistent predictions of warming and drying in the entire Mediterranean and other regions, we have examined the interactions of intrinsic water-use efficiency (W i) with environmental conditions in Pinus halepensis. We used 30-year (1974-2003) tree-ring records of basal area increment (BAI) and cellulose 13C and 18O composition, complemented by short-term physiological measurements, from three sites across a precipitation (P) gradient (280-700 mm) in Israel. The results show a clear trend of increasing W i in both the earlywood (EW) and latewood (LW) that varied in magnitude depending on site and season, with the increase ranging from ca. 5 to 20% over the study period. These W i trends were better correlated with the increase in atmospheric CO 2 concentration, C a, than with the local increase in temperature (~0.04°C year -1), whereas age, height and density variations had minor effects on the long-term isotope record. There were no trends in P over time, but W i from EW and BAI were dependent on the interannual variations in P. From reconstructed C i values, we demonstrate that contrasting gas-exchange responses at opposing ends of the hydrologic gradient underlie the variation in W i sensitivity to C a between sites and seasons. Under the mild water limitations typical of the main seasonal growth period, regulation was directed at increasing C i/C a towards a homeostatic set-point observed at the most mesic site, with a decrease in the W i response to C i with increasing aridity. With more extreme drought stress, as seen in the late season at the drier sites, the response was W i driven, and there was an increase in the W i sensitivity to C a with aridity and a decreasing sensitivity of C i to C a. The apparent C a-driven increases in W i can help to identify the adjustments to drying conditions that forest ecosystems can make in the face of predicted atmospheric change.

AB - Motivated by persistent predictions of warming and drying in the entire Mediterranean and other regions, we have examined the interactions of intrinsic water-use efficiency (W i) with environmental conditions in Pinus halepensis. We used 30-year (1974-2003) tree-ring records of basal area increment (BAI) and cellulose 13C and 18O composition, complemented by short-term physiological measurements, from three sites across a precipitation (P) gradient (280-700 mm) in Israel. The results show a clear trend of increasing W i in both the earlywood (EW) and latewood (LW) that varied in magnitude depending on site and season, with the increase ranging from ca. 5 to 20% over the study period. These W i trends were better correlated with the increase in atmospheric CO 2 concentration, C a, than with the local increase in temperature (~0.04°C year -1), whereas age, height and density variations had minor effects on the long-term isotope record. There were no trends in P over time, but W i from EW and BAI were dependent on the interannual variations in P. From reconstructed C i values, we demonstrate that contrasting gas-exchange responses at opposing ends of the hydrologic gradient underlie the variation in W i sensitivity to C a between sites and seasons. Under the mild water limitations typical of the main seasonal growth period, regulation was directed at increasing C i/C a towards a homeostatic set-point observed at the most mesic site, with a decrease in the W i response to C i with increasing aridity. With more extreme drought stress, as seen in the late season at the drier sites, the response was W i driven, and there was an increase in the W i sensitivity to C a with aridity and a decreasing sensitivity of C i to C a. The apparent C a-driven increases in W i can help to identify the adjustments to drying conditions that forest ecosystems can make in the face of predicted atmospheric change.

KW - Aleppo pine

KW - CO fertilization

KW - Dryland productivity

KW - Isotope dendrology

KW - Stomatal conductance

UR - http://www.scopus.com/inward/record.url?scp=80052678718&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=80052678718&partnerID=8YFLogxK

U2 - 10.1007/s00442-011-2010-4

DO - 10.1007/s00442-011-2010-4

M3 - Article

C2 - 21590331

AN - SCOPUS:80052678718

VL - 167

SP - 573

EP - 585

JO - Oecologia

JF - Oecologia

SN - 0029-8549

IS - 2

ER -