Patterns of nitrogen and phosphorus stoichiometry among leaf, stem and root of desert plants and responses to climate and soil factors in Xinjiang, China
Patterns of nitrogen and phosphorus stoichiometry among leaf, stem and root of desert plants and responses to climate and soil factors in Xinjiang, China
复制标题
新疆荒漠植物叶、茎、根氮磷化学计量格局及其对气候和土壤因子的响应
DOI：
10.1016/j.catena.2020.105100
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发表时间：
2021-04-01
期刊：
影响因子：
6.2
通讯作者：
Han, Wenxuan
中科院分区：
文献类型：
--
作者：
Luo, Yan;Peng, Qingwen;Han, Wenxuan
氮、磷在植物生长中起着重要作用，在荒漠生态系统中应引起重视。植物各器官养分的化学计量模式可以反映植物获取资源的权衡和生长策略。然而，目前还不清楚这些营养物质是如何在荒漠植物器官之间分配的，以及它们与干旱气候条件的关系。本研究的目的是研究植物氮和磷化学计量在荒漠植物器官之间的变化，以及它们如何响应气候和土壤因素。因此，我们分析了N和P化学计量的叶，茎，根收集在新疆，中国，以实现这一目标。研究表明，茎中N、P含量的平均值（分别为17.5 +/- 0.2和1.0 +/- 0.02 mg g（-1））和根（分别为10.3 ± 0.2和0.7 ± 0.01 mg g（-1））显著低于叶片茎中N：P比值（19.1 +/-0.3）显著高于蛾类（17.6 +/- 0.4），而叶中N：P比值（18.2 +/-0.3）与茎和蛾类无显著差异。在植物各生活型中，灌木叶和根的N和N：P均高于乔木和草本，乔木3个器官的P均显著低于灌木和草本。研究结果表明，土壤因子对不同器官间N、P化学计量有直接影响，气候因子通过影响土壤因子对N、P化学计量有间接影响。本研究提供了荒漠植物器官N、P的化学计量特征及其与环境变量的关系，有助于了解中亚荒漠生态系统N、P的化学计量模式、利用策略及其对全球气候变化的潜在响应。
Nitrogen (N) and phosphorus (P) play essential roles in plant growth and deserve more attention in desert ecosystems. Nutrients stoichiometry patterns across various plant organs can reflect the plants' trade-offs to obtain resources and their growth strategy. However, it is still unclear how these nutrients are allocated among desert plant organs and how they are related to the arid climate conditions. This study aimed to examine how plant N and P stoichiometry varies among the organs of desert plants, and how they respond to climate and soil factors. Therefore, we analyzed N and P stoichiometry of leaves, stems, and roots collected from 29 desert sites in Xinjiang, China, to achieve this goal. Our studies indicated that the mean N and P concentrations in the stems (17.5 +/- 0.2 and 1.0 +/- 0.02 mg g(-1), respectively) and roots (10.3 +/- 0.2 and 0.7 +/- 0.01 mg g(-1), respectively) were significantly lower than those in leaves (21.4 +/- 0.3 and 1.2 +/- 0.02 mg g(-1), respectively); the N:P ratio in stems (19.1 +/- 0.3) was significantly higher than those in mots (17.6 +/- 0.4), but N:P in leaves (18.2 +/- 0.3) was not significantly different from those in stems and mots. Across plant life forms, N and N:P of both leaves and roots were respectively higher in shrubs than those in trees and herbs, P in three organs were significantly lower in trees than those in shrubs and herbs. Moreover, our results demonstrated that most soil factors had direct influences on N and P stoichiometry among different organs, and climate factors had indirect effect on N and P stoichiometry by affecting soil factors. This study provided the N and P stoichiometric characteristics of desert plant organs and explored their relationships with environmental variables, which can help understand nutrient stoichiometry patterns and utilization strategy of N and P and their potential responses to global climate changes in the desert ecosystems of central Asia.