Abstract
We investigated forest responses to global warming by observing: (1) planted Pinus halepensis forests, (2) an aridity gradient—with annual precipitation (P) ranging from ~300 to ~700 mm, and (3) periods of wet and dry climate that included the driest period during at least the last 110 years. We examined: (1) how the length of climatic integration periods to which trees are most responsive varies in space and time, (2) the extent to which competition modulates growth decline during drought (2011) and subsequent recovery (2012) years. The temporal scale of rainfall that was most influential on growth shortened in progressing southward, and in the drier than in the wetter period. Long-term underground water storage, as reflected in the relationship of growth to multiple-year rainfall, remained significant up to the point where P ≈ 500 mm. Under drier conditions (P < 500 mm) in both space and time, influential rainfall scales shortened, probably reflecting a diminishing role of water storage. These drier locations are the first from which the species would be likely to retreat if global warming intensified. Competition appeared to set an upper limit to growth, while growth variation among individual trees increased as competition-intensity decreased. That upper limit increased in 2012 compared with 2011. The observed insensitivity of slow-growing trees to competition implies that mortality risk may be density independent, when even any potential for higher soil moisture availability in open stands is lost to evapotranspiration before it can benefit tree growth.
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Acknowledgments
We thank David Brand, Israel Tauber, Ronen Talmor, Efrat Sheffer, and Shmuel Sprintsin for providing helpful information and resources. The Israeli Forest Service (KKL) willingly provided forest geographic information system layers and purchased the equipment and software for the dendrochronological analysis. We thank Arnon Cooper, Or Livni, Adam Wattenberg, Yoni Waitz, Ezra Ben-Moshe, and Yosi Moshe for assistance in field work. This study is supported by grants from the Chief Scientist of the Israeli Ministry of Agriculture and Rural Development, and the Jewish National Fund. M. D. acknowledges financial support from the René Karshon Foundation. D. S. acknowledges financial support from the Short Scientific Visit programme of the European Forest Institute (Mediterranean Office)—EFIMED.
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Communicated by Russell K Monson.
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Dorman, M., Perevolotsky, A., Sarris, D. et al. The effect of rainfall and competition intensity on forest response to drought: lessons learned from a dry extreme. Oecologia 177, 1025–1038 (2015). https://doi.org/10.1007/s00442-015-3229-2
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DOI: https://doi.org/10.1007/s00442-015-3229-2