Sensitivity of sub-annual grey pine (Pinus sabiniana) stem growth to water supply and demand in central California

IF 2.7 3区 农林科学 Q1 FORESTRY
Jackie Y. Ho , Miriam R. Johnston , Matthew P. Dannenberg , Antoine Cabon , Paul R. Moorcroft
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引用次数: 0

Abstract

Pinus sabiniana (grey pine) is a common associate of Quercus douglasii (blue oak) in the iconic, ecologically-rich, and economically-relevant Mediterranean woodland savannah of California, USA. While there are dozens of Q. douglasii sites in the International Tree-Ring Data Bank, P. sabiniana was conspicuously absent, and little is known about its growth patterns or water relations. Here, we introduce a new tree-ring chronology of P. sabiniana collected in central California and assess climatic drivers of annual and sub-annual growth. Specifically, we examine earlywood, latewood, and total annual ring widths and analyse their relationships with variables related to water supply (precipitation, soil moisture) and water demand (air temperature, potential evaporation rate). Annual and earlywood widths had nearly identical responses to climate, likely because annual widths mostly consisted of earlywood (mean: 88 %). In both cases, growth was strongly and positively associated with water supply and negatively associated with water demand. Soil moisture was, by far, the strongest and most temporally-consistent correlate of P. sabiniana growth: correlations between soil moisture and annual growth were >0.8 for five contiguous 3-month seasons. Other variables were significant, in part, because of their influence on soil moisture. The association between latewood growth and climate was qualitatively similar but weaker and, with the exception of soil moisture, more seasonally localised (precipitation was relevant in winter and early spring and water demand variables were relevant in summer, somewhat later in the season than for total ring width and earlywood). Further, P. sabiniana growth was nearly always more sensitive to soil moisture than growth of either co-located Q. douglasii or P. ponderosa (ponderosa pine) at a neighbouring site, suggesting that it may act as a particularly sensitive harbinger of drought stress in this ecosystem.

加利福尼亚中部亚年灰松(Pinus sabiniana)茎干生长对水供需的敏感性
灰松(Pinus sabiniana)是美国加利福尼亚州具有标志性、生态丰富且具有经济意义的地中海林地热带草原中槲栎(Quercus douglasii)的常见伴生植物。虽然国际树环数据库中有数十个 Q. douglasii 的地点,但明显缺少 P. sabiniana,而且人们对其生长模式或水关系知之甚少。在这里,我们介绍了在加利福尼亚中部采集的新的 P. sabiniana 树环年代学,并评估了年生长和次年生长的气候驱动因素。具体来说,我们研究了早材、晚材和总年轮宽度,并分析了它们与水分供应(降水、土壤湿度)和水分需求(气温、潜在蒸发率)相关变量的关系。年轮宽度和早材宽度对气候的反应几乎相同,这可能是因为年轮宽度主要由早材组成(平均值:88%)。在这两种情况下,生长都与水分供应密切正相关,而与水分需求负相关。到目前为止,土壤水分与沙比利叶蝉生长的相关性最强,时间上也最一致:在五个连续的 3 个月季节中,土壤水分与年生长量的相关性为 0.8。其他变量之所以重要,部分原因在于它们对土壤水分的影响。晚材生长与气候之间的关系在性质上相似,但较弱,而且除土壤水分外,季节性更强(降水与冬季和早春有关,需水变量与夏季有关,与总环宽和早材相比,季节性稍晚)。此外,P. sabiniana 的生长对土壤水分的敏感性几乎总是高于邻近地点的 Q. douglasii 或 P. ponderosa(松柏),这表明它可能是该生态系统中干旱压力的一个特别敏感的预兆。
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来源期刊
Dendrochronologia
Dendrochronologia FORESTRY-GEOGRAPHY, PHYSICAL
CiteScore
5.50
自引率
13.30%
发文量
82
审稿时长
22.8 weeks
期刊介绍: Dendrochronologia is a peer-reviewed international scholarly journal that presents high-quality research related to growth rings of woody plants, i.e., trees and shrubs, and the application of tree-ring studies. The areas covered by the journal include, but are not limited to: Archaeology Botany Climatology Ecology Forestry Geology Hydrology Original research articles, reviews, communications, technical notes and personal notes are considered for publication.
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