Non-linear Response to Cell Number Revealed and Eliminated From Long-Term Tracheid Measurements of Scots Pine in Southern Siberia

• DOI: 10.3389/fpls.2021.719796
• Publication Date: 2021-10-04T07:19:21Z
• Authors: Elena A. Babushkina; Dmitry R. Dergunov; Liliana V. Beloko...; Dina F. Zhirnova; Keshav K. Upadhyay; Shri K. Tripathi; Mikhail S. Zharkov; Eugene A. Vaganov
• Keywords: Tracheid; Dendroclimatology; Scots pine; Growing season

Dendroclimatic research offers insight into tree growth-climate response as a solution to the forward problem and provides reconstructions of climatic variables products reverse problem. Methodological developments in dendroclimatology have led inclusion variety growth parameters this field. Tree-ring traits developed during short time intervals growing season can potentially provide finer temporal scale both dendroclimatic applications offer better understanding mechanisms reaction variations. Furthermore, transition from classical studies based on single integral variable (tree-ring width) modern multitude quantitative (e.g., wood anatomical structure) adds lot complexity, which mainly arises intrinsic feedbacks between muddles seasonality registered signal. This study utilized life-long measurements 150- 280-year-old trees Pinus sylvestris L. moisture-sensitive habitat forest-steppe Southern Siberia (Russia) investigate eliminate legacy effect cell production tracheid traits. Anatomical were calculated describe results three main subsequent stages conifer xylem development, namely, number per radial file ring, mean maximum diameter, cell-wall thickness. Although tree-ring width was almost directly proportional number, non-linear relationships with revealed measurements. They exhibited stronger relationship areas narrow rings stable structure wider rings. The exponential models proposed demonstrated these numerical terms morphometric meaning. ratio their modeled values used develop long-term chronologies, proved retain information about fluctuations independent (cell number), despite decreased common