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Climate and soil change nutrient element allocation of Siberian larch in the Mongolian semiarid forest
Agricultural and Forest Meteorology ( IF 6.2 ) Pub Date : 2022-01-18 , DOI: 10.1016/j.agrformet.2022.108825
Wenqi He 1 , Hongyan Liu 1 , Liang Shi 1 , Mei Zhou 2 , Yang Qi 1 , Feng Liu 1 , Xinrong Zhu 1 , Pengwu Zhao 2 , Changlin Xiang 3 , Yang Shu 2
Affiliation  

Ecological stoichiometry of nutrients regulates both tree growth and resilience to environmental stress. Exploring the accumulation of nutrient elements and changes in ecological stoichiometry under a drying climate is critical to understand the responses of drought-threatened trees in semiarid region to climate drying. Here, we conducted large-scale sampling of Larix sibirica-dominated forest patches of different sizes at 5 sites with different mean annual precipitation (MAP) in semiarid northern Mongolia in August 2017. The results showed that the accumulation and the stoichiometric ratio of elements in plants were affected by climate factors and soil factors. Soil N (44.9%) and MAP (29.9%) explain most of the total variance of ecological stoichiometry in leaves, while MAP explained 64.5% of the total variance of ecological stoichiometry in branches. The N and P contents in both the leaves and branches of Larix sibirica significantly increased, while the C:N and C:P ratios in leaves and the C:N ratio in branches significantly decreased with decreasing MAP (P < 0.05). And the response trend of branch stoichiometry was larger than that of leaf stoichiometry. Our results imply that increased storage of nitrogen in branches might benefit trees to resist water deficit, which contributes to the assessment of ecological resilience to water deficit for trees in semiarid forests.



中文翻译:

蒙古半干旱林西伯利亚落叶松气候及土壤变化养分分配

养分的生态化学计量调节树木生长和对环境压力的恢复力。探索干旱气候下营养元素的积累和生态化学计量的变化对于了解半干旱地区受干旱威胁的树木对气候干燥的响应至关重要。在这里,我们对西伯利亚落叶松进行了大规模采样2017年8月蒙古北部半干旱地区5个不同年平均降水量(MAP)地点的不同大小的优势森林斑块。结果表明,植物中元素的积累和化学计量比受气候因素和土壤因素的影响。土壤 N (44.9%) 和 MAP (29.9%) 解释了叶子生态化学计量总方差的大部分,而 MAP 解释了树枝生态化学计量总方差的 64.5%。西伯利亚落叶松叶片和枝条中 N 和 P 含量均显着增加,而随着 MAP 的降低,叶片 C:N 和 C:P 比和枝条 C:N 比显着降低 ( P < 0.05)。并且树枝化学计量的响应趋势大于叶化学计量的响应趋势。我们的研究结果表明,增加树枝中氮的储存可能有利于树木抵抗缺水,这有助于评估半干旱森林中树木对缺水的生态恢复力。

更新日期:2022-01-19
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