College of Geography and Environmental Science, Northwest Normal University, No. 967, Anning East Road, Lanzhou, 730070, China.
Key Laboratory of Resource Environment and Sustainable Development of Oasis, Gansu Province, Northwest Normal University, Lanzhou, 730070, China.
Int J Biometeorol. 2024 Jun;68(6):1155-1167. doi: 10.1007/s00484-024-02655-z. Epub 2024 Mar 19.
It can provide a basis for decision making for the conservation and sustainable use of forest ecosystems in mountains to understand the stoichiometric properties and nutrient allocation strategies of major tree species. However, the plant nutrient allocation strategies under different environmental gradients in forest systems of arid and semi-arid mountains are not fully understand. Therefore, three typical regions in the Qilian Mountains on the eastern edge of the Qinghai-Tibet Plateau were selected based on precipitation and temperature gradients, and the stoichiometric characteristics and nutrient allocation strategies of Qinghai spruce (Picea crassifolia) of the dominant tree species under different environmental gradients were investigated. The results showed that (1) the stoichiometric characteristics of plant tissues were different in the three regions. (2) The importance of each tissue in the plant nutrient allocation varied in different regions, showing that the plant roots are more important in the warm-wet region, while the plant leaves, branches and trunks are more important in the transition and hot-dry regions. (3) The influencing factors affecting plant nutrient allocation strategies were inconsistent across regions, which showed that plant nutrient allocation strategies in the warm-wet and transition region were mainly influenced by soil factors, while they were more influenced by climatic factors in the hot-dry region. The patterns of plant nutrient allocation strategies and drivers under different environmental gradients could help us better understand the ecological adaptation mechanism and physiological adjustment mechanism of forest ecosystem in mountains.
它可以为了解主要树种的化学计量特性和养分分配策略，为山区森林生态系统的保护和可持续利用提供决策依据。然而，在干旱半干旱山区森林系统中，不同环境梯度下的植物养分分配策略还不完全清楚。因此，本研究选择青藏高原东缘祁连山的三个典型区域，根据降水和温度梯度，调查了不同环境梯度下优势树种青海云杉（Picea crassifolia）的化学计量特征和养分分配策略。结果表明：（1）三个区域的植物组织化学计量特征不同；（2）不同区域植物各组织在养分分配中的重要性不同，表现为在暖湿区植物根系更重要，而在过渡区和干热区植物叶片、枝条和树干更重要；（3）影响植物养分分配策略的因素在不同区域不一致，表明在暖湿区和过渡区，植物养分分配策略主要受土壤因素的影响，而在干热区则更多地受气候因素的影响。不同环境梯度下植物养分分配策略及驱动因素的模式可以帮助我们更好地理解山地森林生态系统的生态适应机制和生理调节机制。
