气候变化领域集成服务门户(CCPortal): To which side are the scales swinging? Growth stability of Siberian larch under permanent moisture deficit with periodic droughts

CCPortal

DOI	10.1016/j.foreco.2019.117841
	To which side are the scales swinging? Growth stability of Siberian larch under permanent moisture deficit with periodic droughts
	Zhirnova D.F.; Babushkina E.A.; Belokopytova L.V.; Vaganov E.A.
发表日期	2020
ISSN	0378-1127
卷号	459
英文摘要	In moisture-limited regions in which droughts leave a significant “footprint”, monitoring of quantitative climatic parameters and of forest adaptation and acclimation to these parameters is of utmost importance due to the ambiguity of spatial patterns in reaction of tree growth to drought and the variety of drought resistance strategies exhibited by trees at the genetic, morphological and physiological levels. This is a case study of the radial growth of Siberian larch (Larix sibirica Ledeb.) along the forest-steppe transect in the foothills of the Bateni Ridge (Kuznetsk Alatau, Southern Siberia, Russia) and of its climatic response and stability under the influence of droughts and contributing factors. In this region, a permanent mild moisture deficit is gradually increasing due to warming of the vegetative season by 0.14–0.19 °C per decade; droughts occurred in 1951, 1963–65, 1974–76, and 1999. The forests in the region are represented by pure larch stands in the west and mixed stands of larch with Scots pine and silver birch in the eastern portion of the ridge. The forest-steppe ecotone comprises a significant part of the ridge area, mainly on the southern and southeastern slopes. At 5 sampling sites, dependence of larch growth on precipitation (P) and standardized precipitation-evapotranspiration index (SPEI) during April–July of the current year and June–September of the previous year and on maximum temperature (Tmax) during May–July of the current year and July–September of the previous year was observed. We propose the use of a linear regression model based on the SPEI of these seasons as an individualized indicator of climate aridity, which is biologically significant for larch in the study area. An analysis of pointer years showed that precipitation in November (formation of snow cover) also contributes to larch growth. The larch in the study area tolerates moisture deficit, rebounding after the end of stress exposure. The spatiotemporal patterns of the stability indices revealed that despite the decrease in growth resistance and resilience with drought severity, these characteristics are higher at more arid sites due to trees’ acclimation to permanent climate aridity. The findings contribute to a better understanding of the capability of larch to further acclimatize and provide a basis for planning measures for conservation and/or restoration of the region's forests under climate warming; however, to clarify the contributions of factors at the individual and local scales, further investigation of the stability of larch growth at the level of individual trees may be required. © 2019 Elsevier B.V.
关键词	Climate models Conservation Drought Moisture Physiological models Regression analysis Snow Stability Drought stress Forest-steppe Kuznetsk Alatau Larix sibirica Pointer years Radial growth Forestry acclimation adaptation climate effect cold tolerance coniferous tree drought stress ecomorphology ecophysiology forest-steppe growth response moisture content temperature effect Conservation Drought Moisture Regression Analysis Snow Stability Kuznetsk Alatau Russian Federation Siberia Larix Larix sibirica Pinus sylvestris
语种	英语
来源机构	Forest Ecology and Management
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133048
推荐引用方式 GB/T 7714	Zhirnova D.F.,Babushkina E.A.,Belokopytova L.V.,et al. To which side are the scales swinging? Growth stability of Siberian larch under permanent moisture deficit with periodic droughts[J]. Forest Ecology and Management,2020,459.
APA	Zhirnova D.F.,Babushkina E.A.,Belokopytova L.V.,&Vaganov E.A..(2020).To which side are the scales swinging? Growth stability of Siberian larch under permanent moisture deficit with periodic droughts.,459.
MLA	Zhirnova D.F.,et al."To which side are the scales swinging? Growth stability of Siberian larch under permanent moisture deficit with periodic droughts".459(2020).