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The 2/3 scaling of twig nitrogen to phosphorus in woody plants

Forest Ecosystems 2022年第4期9卷 521-528页

作者： Zhiqiang Wang karl jniklas Zeqing Ma Dechun Jiang Jianming Deng Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research Station Southwest Minzu UniversityChengdu610041China Institute of Qinghai-Tibetan Plateau Southwest Minzu UniversityChengdu610041China Plant Biology Section School of Integrative Plant ScienceCornell UniversityIthacaNY14853USA Center for Forest Ecosystem Studies and Qianyanzhou Ecological Station Key Laboratory of Ecosystem Network Observation and ModelingInstitute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing100101China Chengdu Institute of Biology Chinese Academy of SciencesChengdu610041China State Key Laboratory of Grassland Agro-Ecosystem College of EcologyLanzhou UniversityLanzhou730000China

Background:Nitrogen(N)and phosphorus(P)are important elements for plant metabolism and ***fore,the quantification of the scaling relationship of N to P in plant organs can help us understand many fundamental ecological *** general scaling relationships between N and P in leaves and in fine roots have been *** compared to leaves and fine roots,however,little information is available on the N versus P scaling relationship in the stems of woody plants,especially for *** this study,a comprehensive dataset comprising 2,038 N=P paired observations for a total of 536 woody species was compiled and analyzed to determine whether a general scaling relationship ***:The global mean values of twig N and P concentrations and N:P ratios were 9.33 mg⋅g^(-1),1.12 mg⋅g^(-1) and 10.16,*** N and P concentrations and N:P ratios differed significantly within and across functional groups and *** all of the species,a uniform 0.67 scaling exponent of twig N to P was observed across different functional groups and biomes,i.e.,a 2/3-power scaling relationship was ***,this numerical value differed across different sites,albeit converging onto 0.67 with increasing sample *** total phosphorus was the largest contributor to the variation in the numerical value of the scaling ***:These results provide useful parameters for stoichiometric growth models,and advance our understanding of the mechanisms underlying plant nutrient *** study has potential implications in predicting responses of nutrient cycling in terrestrial ecosystem responses to changes in the environment.

关键词： Nitrogen Phosphorus Scaling exponents Twigs Woody plants

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An elliptical blade is not a true ellipse,but a superellipse–Evidence from two Michelia species

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Journal of Forestry Research 2022年第4期33卷 1341-1348页

作者： Yuping Li karl jniklas Johan Gielis Ülo Niinemets Julian Schrader Rong Wang Peijian Shi College of Horticulture Jinling Institute of TechnologyNanjing 210038People’s Republic of China Bamboo Research Institute Nanjing Forestry UniversityNanjing 210037People’s Republic of China Plant Biology Section School of Integrative Plant ScienceCornell UniversityIthacaNY 14853USA Department of Biosciences Engineering University of AntwerpB-2020 AntwerpBelgium Institute of Agricultural and Environmental Sciences Estonian University of Life Sciences51006 TartuEstonia Estonian Academy of Sciences 10130 TallinnEstonia Department of Biological Sciences Macquarie UniversitySydneyNSW 2109Australia Biodiversity Macroecology and BiogeographyUniversity of Göttingen37077 GöttingenGermany

The shape of leaf laminae exhibits considerable diversity and complexity that reflects adaptations to environmental factors such as ambient light and precipitation as well as phyletic *** leaves appear to be elliptical which may represent a‘default’developmental ***,whether their geometry truly conforms to the ellipse equation(EE),i.e.,(x/a)^(2)+(y/b)^(2)=1,remains *** alternative is described by the superellipse equation(SE),a generalized version of EE,i.e.,|x/a|^(n)+|y/b|^(n)=*** test the efficacy of EE versus SE to describe leaf geometry,the leaf shapes of two Michelia species(i.e.,*** ***,and ***),were investigated using 60 leaves from each *** shows that the majority of leaves(118 out of 120)had adjusted root-mean-square errors of<0.05 for the nonlinear fitting of SE to leaf geometry,i.e.,the mean absolute deviation from the polar point to leaf marginal points was smaller than 5%of the radius of a hypothesized circle with its area equaling leaf *** estimates of n for the two species were<2,indicating that all sampled leaves conformed to SE and not to *** study confirms the existence of SE in leaves,linking this to its potential functional advantages,particularly the possible influence of leaf shape on hydraulic conductance.

关键词： Bilateral symmetry Leaf ellipticalness index Leaf laminae Leaf roundness index Magnoliaceae

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基于不同养分策略的亚热带常绿与落叶树种的共存机制

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植物生态学报(英文版) 2023年第4期16卷 25-35页

作者： Xiaoping Chen Xingui Le karl jniklas Dandan Hu Quanlin Zhong Dongliang Cheng College of Tourism and Resources Environment Zaozhuang UniversityZaozhuang 277160China Institute of Geography School of Geographical SciencesFujian Normal UniversityFuzhou 350007China Key Laboratory of Humid Subtropical Eco-geographical Process(Ministry of Education) College of Geographical SciencesFujian Normal UniversityFuzhou 350007China Fujian Provincial Key Laboratory of Plant Ecophysiology College of Geographical SciencesFujian Normal UniversityFuzhou 350007China Yangjifeng National Nature Reserve Administration YingtanChina Plant Biology Section School of Integrative Plant ScienceCornell UniversityIthaca 14850NYUSA

常绿和落叶树种共存于中国东南部的亚热带森林中。为探究常绿和落叶树种应对亚热带磷限制所采用的碳获取策略,我们选取阳际峰常绿阔叶林中75种共存的木本植物,包括44种常绿树种和31种落叶树种,测定了其叶片的光合和呼吸速率,以及与碳(C... 详细信息

常绿和落叶树种共存于中国东南部的亚热带森林中。为探究常绿和落叶树种应对亚热带磷限制所采用的碳获取策略,我们选取阳际峰常绿阔叶林中75种共存的木本植物,包括44种常绿树种和31种落叶树种,测定了其叶片的光合和呼吸速率,以及与碳(C)、氮(N)和磷(P)利用效率和再吸收效率的相关性状。落叶树种的光合氮利用效率(PNUE)、单位氮和磷的呼吸速率(R_(d,N)和R_(d,P))均显著高于常绿树种,但光合磷利用效率(PPUE)在二者之间无显著差异。对于任意给定的叶片P,常绿树种的碳利用效率(CUE)高于落叶树种。此外,落叶和常绿植物的氮再吸收效率(NRE)、磷再吸收效率(PRE)和N:P均无显著差异。这些结果表明,常绿树种维持高CUE使其在P限制的亚热带森林中成为优势树种。这些结果对其他生物群落中落叶和常绿物种的养分策略比较具有重要意义,也为未来的气候变化下的亚热带森林的群落动态建模提供了新见解。

关键词：光合养分利用效率碳利用效率氮吸收效率磷吸收效率物种共存

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