Climate change has become a global concern for scientists as it is affecting almost every ecosystem. Larix gmelinii and Betula platyphylla are native and dominant forest species in the Daxing’anling Mountains of Inner Mongolia, playing a major role in carbon sequestration of this region. This study was carried out to assess the effect of climate variables including precipitation and temperature on the biomass of Larix gmelinii and Betula platyphylla forests. For this purpose, we used the climate-sensitive stem biomass allometric model for both species separately to find out accurate stem biomass along with climatic factors from 1950 to 2016. A total of 66 random plots were taken to attain the data from this study area. Larix gmelinii and Betula platyphylla stem biomass have a strong correlation with annual precipitation (R² = 0.86, R² = 0.71, R² = 0.79, and R² = 0.59) and maximum temperature (R² = 0.76, R² = 0.64, R² = 0.67, and R² = 0.52). However, annual minimum temperature (R² = 0.58, R² = 0.43, R² = 0.55, and R² = 0.46) and annual mean temperature (R² = 0.40, R² = 0.22, R² = 0.36, and R² = 0.19) have a relatively negative impact on tree biomass. Therefore, we suggest that both species have a very strong adaptive nature with climatic variation and hence can survive under drought and high-temperature stress climatic conditions.

This paper presents an analysis of tree-ring growth patterns of male and female Fraxinus mandshurica trees from 1931 to 2007. The specific object was to study the response of radial growth to climate variables separately for male and female trees. The results show that the growth patterns in the two genders were similar during the mid-1950s to 1970s but different in the periods 1931–1940s and 1980–2007. In the period 1980–2007, the mean sensitivity and mean widths of the tree rings were significantly different between the genders (p < 0.05). The climate-growth response in female and male trees was also different. Female trees are sensitive to precipitation in November of the previous year, whereas male trees respond to mean temperature in November of the previous year. The results confirm that climatic sensitivity in male and female trees of dioecious species is different, yet this difference is not stable through time.

To improve our understanding of climate-driven long-term dynamics of eastern Asian mountain forests, we used field surveys and dendrochronological techniques to examine regeneration density, growth rate of mature trees, and growth sensitivity to climate of 3 common coniferous tree species at their respective altitudinal distribution limits on Changbai Mountain, northeastern China. The studied species were Manchurian fir (Abies nephrolepis, distributed between 780 and 1750 m asl), Korean pine (Pinus koraiensis, 780 and 1300 m asl), and Jezo spruce (Picea jezoensis var. komarovii, 1000 and 1750 m asl). Regeneration densities did not differ significantly among the elevations except for Jezo spruce, which showed a significantly lower regeneration density at 1000 m asl as compared to 1300 and 1750 m asl. All 3 species showed a significantly higher basal area increment (BAI) at the middle part of their distribution ranges than at their limits. The growth of Manchurian fir and Jezo spruce exhibited hig... Résumé: Afin d'améliorer notre compréhension de la dynamique à long terme de l'influence des facteurs climatiques sur les forêts de montagne de l'est de l'Asie, nous avons réalisé des relevés sur le terrain et utilisé des méthodes dendrochronologiques pour examiner la densité de régénération, le taux de croissance d'arbres matures et la sensibilité au climat de la croissance de trois espèces communes de conifères à leurs limites respectives de répartition altitudinale dans le massif Changbai, au nord-est de la Chine. Les espèces étudiées étaient le sapin de Mandchourie (Abies nephrolepis, retrouvé entre 780 et 1750 m asl), le pin de Corée (Pinus koraiensis, 780 à 1300 m asl) et l'épinette Jezo (Picea jezoensis, 1000 à 1750 m asl). La densité de régénération ne variait pas significativement entre les élévations, sauf pour l'épinette Jezo qui avait une densité de régénération significativement plus faible à 1000 m qu'à 1300 m et 1750 m asl. L'accroissement de la surface terrière pour les trois espèces était...

As the most important way to mitigate climate change, forest carbon storage has been the subject of extensive research. A comprehensive study was carried out to investigate the influence of elevation gradients and diameter classes on the forest growth, composition, diversity, and carbon pools of the Bagh Drush Khel Forest area. Research revealed that elevation gradients significantly influenced the composition, diversity, and carbon pools in forests. At lower elevations, Eucalyptus camaldulensis was the dominant species, with Olea ferruginea as a co-dominant species, whereas at higher elevations, Pinus roxburghii was the dominant species with Quercus incana as a co-dominant species. Regeneration was higher at higher elevations with the maximum number of saplings and seedlings of P. roxburghii. Species diversity association with elevation was negative (R² = −0.44; p < 0.05—Shannon Index). Soil organic carbon (SOC association with elevation was non-significant while positive with DBH classes (R² = 0.37; p < 0.05). Overall, carbon pool association with elevation and diameter at breast height (DBH) were negative (R² = −0.73; p < 0.05) and (R² = −0.45; p < 0.05). Litter biomass correlated positively with elevation (R² = 0.25; p < 0.05) and DBH (R² = 0.11; p < 0.05), while deadwood biomass correlated negatively with elevation gradients (R² = −0.25; p < 0.05), and no effect was observed for DBH classes. The highest carbon stock (845.89 t C/ha) was calculated at low elevations, which decreased to (516.27 t C/ha) at high elevations. The overall carbon stock calculated was (2016.41 t C/ha) respectively. A total of six tree species were found at the study site. Future research is essential for forest health monitoring and understanding fine-scale impacts. This study offers a methodological framework for similar investigations in unexplored yet potentially significant forest regions worldwide.