氮添加下温带天然林不同生活型植物叶片和细根的氮-磷分配策略

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中文摘要：在中国北方地区迅速增加的氮沉降可能会影响植物的化学计量特征.然而,人们很少关注氮沉降对不同生活型植物(如乔木、灌木和草本)的氮(N)和磷(P)分配策略的影响.本研究评估了不同生活型植物的叶片和细根中N和P的化学计量特征及其异速生长指数在长期N添加下的响应.研究结果表明,与对照相比,在N添加处理下,灌木和草本植物叶片的N和P含量增加,而乔木叶片养分含量的变化不显著.N添加对不同生活型植物细根的N和P含量没有显著影响.对比养分在器官间的分配系数,在3种生活型植物中,N添加处理下植物会将更多的N和P分配到叶片中.此外,对比各器官中N-P的分配关系,乔木的叶片和细根的N-P分配指数与1.0没有显著差异,表现为等速生长模式.灌木和草本植物的N-P含量分配指数显著小于1.0,表现为异速生长模式.与N元素相比,高N处理使灌木和草本植物的叶片分配更多P,但是高N处理对乔木叶片N和P分配影响不显著.植物各器官的N-P分配模式表明,N添加水平改变了植物的养分分配策略,同时这种分配策略在各生活型间表现出显著差异.本研究强调了在评估森林植物的N-P分配策略时,生活型类别的重要性.

外文标题：Life form-dependent nitrogen-phosphorous allocation strategies of leaf and fine root in a temperate natural forest under long-term nitrogen addition

外文摘要：Nitrogen deposition has increased rapidly in eastern China,which can affect the stoichiometric characteristics of plants.However,the effects of N addition on the nitrogen(N)and phosphorous(P)allocation strategies for various plant life forms(e.g.trees,shrubs and herbs)have rarely been studied.In this study,we evaluated the effects of N addition on N and P stoichiometry and their scaling exponents in the leaves and fine roots of the different life form groups.N and P concentrations in the leaves of shrubs and herbs increased under N addition treatments,whereas tree leaves exhibited a more stable response.In contrast,N addition had no significant effect on N and P concentrations in the fine roots of the three plant life forms.N addition enhanced the allocation of more N and P to the leaves than to the fine roots in all three life forms.Furthermore,the N-P allocation scaling exponents of the leaves and fine roots of the trees were equal to 1.0,indicating an isometric pattern.In contrast,the N-P allocation scaling exponents of shrubs and herbs were less than 1.0,indicating an allometric pattern.Although high N availability promoted shrubs and herbs to distribute P to leaves at a higher proportion than N,only slight effects were detected in tree leaves.These changes in N-P allocation patterns indicate that life forms and N addition levels work together to modulate plants allocation strategies.These results suggest the importance of life form categories when evaluating N-P allocation strategies in forest plants.

外文关键词：

nitrogen additionnatural Pinus tabulaeformis forestfine rootsleavesN and P stoichiometryN-P allocation scaling exponent

作者：

Jiangshan Yu、Zhaopeng Song、Jihua Hou

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作者单位：

School of Ecology and Nature Conservation,Beijing Forestry University,Beijing 100083,China

Laboratory for Earth Surface Processes(MOE),College of Urban and Environmental Science,Peking University,Beijing 100871,China

关键词：

氮添加天然油松(Pinus tabulaeformis)林细根叶片 N和P化学计量特征 N-P分配指数

基金：

国家自然科学基金National Science and Technology Basic Resource Survey Program of China

项目编号：

318726832019FY0101301

出版年：

2023

DOI：

10.1093/jpe/rtad013

植物生态学报(英文版)

CSCD

ISSN：1752-9921

年,卷(期)：2023.(5)

参考文献量69