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Key messageAbove- and belowground tissues showed different trends in IAA, CTK and CTK/IAA ratios with elevations, and coppicing changed the levels of endogenous hormones that are related to resprouting ability. Abstract Little is known about how plant hormones and nitrate concentrations change in plants with increasing elevations, and whether the alpine treeline formation and the decreased...
A tree’s crown interacts with atmospheric variables such as CO2, temperature, and humidity. Physioecology of leaves/needles (e.g. δ13C, mobile carbohydrates, and nitrogen) is, therefore, strongly affected by microclimate in and surrounding a tree crown. To understand the physiological responses of leaves to changes in air temperature and moisture, we measured δ13C, soluble sugars, starch, and total...
Knowledge on variations in stomata is useful in reflecting leaf physiological characteristics of CO2 uptake and water transpiration, and predicting the responses of plants to future climate change. Stomatal density and number of stomatal rows (current-year, 1- and 2-year-old needles) in relation to tree age (ranging from 25 to 320 years old), elevation (ranging from 738 to 1,380 m a.s.l.), and sun...
There is, so far, no common conclusion about photosynthetic responses of trees to long-term exposure to elevated CO2. Photosynthesis and specific leaf area (SLA) of 1-year-old and current-year needles in Pinus koraiensis and P. sylvestriformis grown in open-top chambers were measured monthly for consecutive two growing seasons (2006, 2007) after 8–9 years of CO2 enrichment in northeastern China, to...
Genetic linkage maps are essential for molecular breeding program. The first genetic linkage map of Pinus koraiensis, using an F1 progeny of 94 individuals, was constructed in the present paper. One hundred and twenty-two molecular markers were mapped onto 11 linkage groups, 1 triple and 8 pairs at the linkage criteria LOD 4.0. Among these markers, there were 96 sequence-related amplified polymorphism...
Tree-ring width and age structure of Juniperus przewalskii (Qilian juniper) forests were analyzed for four tree-line sites in Qilian and Anyemaqen Mountains, northeastern Tibetan Plateau, to investigate their relationships to climate change. Tree-line growth on Qilian Mountain was mainly limited by temperature at the low-frequency band. However, tree-line growth in the Anyemaqen Mountain was highly...
Conifer needles of different ages perform differently in ecophysiology. However, no study has investigated the biomass distribution of different-aged needles in a tree crown or/and a stand canopy. We carried out a study on young (∼50 years old) and old (∼200 years) Pinus cembra L. trees at highland (2100–2300 m a.s.l.) and lowland (570 m) sites in Switzerland. We found that both the young and the...
Abstract. Carbohydrate stores may hold the answer to the old question whether treeline trees are carbon limited. However, it is still unknown how sensitively mobile carbon pools reflect the carbon supply status of trees in cold climates. There may be an inherent lower limit to the depletion of these pools, which could restrict their usefulness as indicator values. Here we examined the responsiveness...
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