NOAA/WDS Paleoclimatology - Mašek - 15SS Kokořínsko - PISY - ITRDB CZE048

Inter-annual climatically driven growth variability of above-ground biomass compartments (for example, tree stems and foliage) controls the intensity of carbon sequestration into forest ecosystems. However, understanding the differences between the climatic response of stem and foliage at the landscape level is limited. In this study, we examined the climate-growth response of stem and leaf biomass and their relationship for Pinus sylvestris (PISY) and Picea abies (PCAB) in topographically complex landscapes. We used tree-ring width chronologies and time series of the normalized difference vegetation index (NDVI) derived from high-resolution Landsat scenes as proxies for stem and leaf biomass, respectively. We then compared growth variability and climate-growth relationships of both biomass proxies between topographical categories. Our results show that the responses of tree rings to climate differ significantly from those found in NDVI, with the stronger climatic signal observed in tree rings. Topography had distinct but species-specific effects: At moisture-limited PISY stands, stem biomass (tree rings) was strongly topographically driven, and leaf biomass (NDVI) was relatively insensitive to topographic variability. In landscapes close to the climatic optimum of PCAB, the relationship between stem and leaf biomass was weak, and their correlations with climate were often inverse, with no significant effects of topography. Different climatic signals from NDVI and tree rings suggest that the response of canopy and stem growth to climate change might be decoupled. Furthermore, our results hint toward different prioritizations of biomass allocation in trees under stressful conditions which might change allometric relationships between individual tree compartments in the long term.

这份归档的古气候学研究（Paleoclimatology Study）可通过古气候学世界数据服务（World Data Service, WDS）从美国国家海洋和大气管理局（NOAA）国家环境信息中心（National Centers for Environmental Information, NCEI）获取。相关的NCEI研究类型为树木年轮（Tree Ring）。数据包含树木年轮参数，其地理位置位于东欧的捷克共和国。时间范围覆盖距今（before present, BP）日历年度的94年至-69年。参数及研究地点的详细信息请参见元数据。使用数据时请引用本研究。