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Degree of shade tolerance shapes seasonality of chlorophyll, nitrogen and phosphorus levels of trees and herbs in a temperate deciduous forest

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Journal of Forestry Research 2024年第4期35卷 60-72页

作者： Jiajia Zeng Fan Liu Yuan Zhu Jiayi Li Ying Ruan Xiankui Quan Chuankuan Wang Xingchang Wang Aulin College Northeast Forestry UniversityHarbin 150040People’s Republic of China Center for Ecological Research Northeast Forestry UniversityHarbin 150040People’s Republic of China Key Laboratory of Agricultural Water Resources Center for Agricultural Resources ResearchInstitute of Genetics and Developmental BiologyChinese Academy of SciencesShijiazhuang 050021People’s Republic of China Institute of Applied Ecology Chinese Academy of SciencesShenyang 110016People’s Republic of China Key Laboratory of Sustainable Forest Ecosystem Management Ministry of EducationNortheast Forestry UniversityHarbin 150040People’s Republic of China

Forest productivity is closely linked to seasonal variations and vertical differentiation in leaf ***,leaf structural and chemical traits variation among co-existing species,and plant functional types within the canopy are poorly *** this study,the seasonality of leaf chlorophyll,nitrogen(N),and phosphorus(P)were quantified vertically along the canopy of four major tree species and two types of herbs in a temperate deciduous *** role of shade tolerance in shaping the seasonal variation and vertical differentiation was *** the entire season,chlorophyll content showed a distinct asymmetric unimodal pattern for all species,with greater chlorophyll levels in autumn than in spring,and the timing of peak chlorophyll per leaf area gradually decreased as shade tolerance *** a:b ratios gradually decreased with increasing shade *** N and P contents sharply declined during leaf expansion,remained steady in the mature stage and decreased again during leaf *** the seasons,the lower canopy layer had significantly higher chlorophyll per leaf mass but not chlorophyll per leaf area than the upper canopy layer regardless of degree of shade ***,N and P per leaf area of intermediate shade-tolerant and fully shade-tolerant tree species were significantly higher in the upper canopy than in the *** variations in N:P ratios suggest changes in N or P *** findings indicate that shade tolerance is a key feature shaping inter-specific differences in leaf chlorophyll,N,and P contents as well as their seasonality in temperate deciduous forests,which have significant implications for modeling leaf photosynthesis and ecosystem production.

关键词： Leaf traits Leaf nutrients Seasonal variations Chlorophyll Nitrogen Phosphorus shade tolerance Canopy layers

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A study on the shade tolerance of Muehlewbeckia complera

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Journal of Forestry Research 2004年第1期15卷 83-85,J004页

作者：岳桦关学瑞姜斌斌东北林业大学

Muehlewbeckia complera was introduced to China in 2002 as indoor-hanging ornamental foliage plant. The experiment of the shade tolerance for this species was carried out in different light intensities (0.14–946.00 μmol·m?2·s?1). After 40 days in experimental areas, leaf photosynthentic characteristics indexes ofM. complera in different photosynthesis active radiation (PAR) were measured with LI-COR6400 apparatus, such as the light compensation point, light saturation point, and maximum net photosynthesis rate, at the same time, the increments of total leaf area and leaf amount were measured. The results showed that the optimum light intensity range forM. complera was from 9.26 μmol·m?2·s?1 to 569.00 μmol·m?2·s?1 (463–28150 lx, relative humidity (RH) for 46–60%, temperature at 16–22°C). Under this condition, leaf photosynthetic efficiency was tiptop. AlthoughM. complera belonged to the moderate sun-adaptation plant species, the plant growth was inhibited when PAR increased to the level of 569.000 μmol·m?2·s?1 or above.M. complera could sprout new leaves in photosynthesis active radiation of 0.16–19.22 μmol·m?2·s?1 (8–961 lx), or 10 μmol·m?2·s?1 for above 6 h. Keywords Muehlewbeckia complera - shade tolerance - Cultivation - Photosynthesis CLC number S602.1 Document code A Foundation item: This study was supported by the Research Foundation of Northeast Forestry University.Biography: YUE Hua (1962-), female, Associate professor in Northeast Forestry University, Harbin 150040, P. R. China.Responsible editor: Zhu Hong

关键词： Muehlewbeckia complera shade tolerance Cultivation Photosynthesis

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Afforestation,restoration and regeneration——Not all trees are created equal

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Journal of Forestry Research 2014年第1期25卷 3-20页

作者： Shaneka S.Lawson Charles H.Michler USDA Forest Service Northern Research StationHardwood Tree Improvement and Regeneration Center (HTIRC)Purdue UniversityDepartment of Forestry and Natural Resources

Undulations in weather patterns have caused climate shifts of increased frequency and duration around the world. The need for additional research and model data on this pressing problem has resulted in a plethora of research groups examining a particular tree species or biome for negative effects of climate change. This review aims to （1） collect and merge recent research data on regeneration within old- and new-growth forests, （2） highlight and expand upon selected topics for additional discussion, and （3） report how shade tolerance, drought toler- ance, and inherent plasticity affect tree growth and development. Al- though shade and drought tolerance have been well studied by a number of research groups, this review reveals that in-depth analysis of a single or a few species in a given area will not generate the data required to implement a successful regeneration plan. Studies using historical accounts of previous species composition, information regarding site sea- sonality, species competition, and individual responses to drought and shade are needed to （1） develop best management plans and （2） ensure future modeling experiments are focused on a greater variety of species using more innovative methods to evaluate climate change effects.

关键词： Climate change shade tolerance drought tolerance canopy gaps invasive species

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Tree diversity effects on forest productivity increase through time because of spatial partitioning

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Forest Ecosystems 2020年第3期7卷 327-333页

作者： Shinichi Tatsumi Department of Biological Sciences University of Toronto ScarboroughTorontoONCanada Hokkaido Research Center Forestry and Forest Products Research InstituteHokkaidoJapan

Background: Experimental manipulations of tree diversity have often found overyielding in mixed-species plantations. While most experiments are still in the early stages of stand development, the impacts of tree diversity are expected to accumulate over time. Here, I present findings from a 31-year-old tree diversity experiment(as of2018) in ***: I find that the net diversity effect on stand biomass increased linearly through time. The species mixture achieved 64% greater biomass than the average monoculture biomass 31 years after planting. The complementarity effect was positive and increased exponentially with time. The selection effect was negative and decreased exponentially with time. In the early stages(≤ 3 years), the positive complementarity effect was explained by enhanced growths of early-and mid-successional species in the mixture. Later on(≥ 15 years), it was explained by their increased survival rates owing to vertical spatial partitioning — i.e. alleviation of self-thinning via canopy stratification. The negative selection effect resulted from suppressed growths of late-successional species in the bottom ***: The experiment provides pioneering evidence that the positive impacts of diversity-driven spatial partitioning on forest biomass can accumulate over multiple decades. The results indicate that forest biomass production and carbon sequestration can be enhanced by multispecies afforestation strategies.

关键词： Biomass productivity Complementarity effect Biodiversity and ecosystem functioning Forest dynamics Mixed plantation Plant succession Selection effect shade tolerance Stand structure Tree diversity experiment

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Soil water content and nitrogen differentially correlate with multidimensional leaf traits of two temperate broadleaf species

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Plant Diversity 2023年第6期45卷 694-701页

作者： Ming-Yue Jin Daniel J.Johnson Guang-Ze Jin Qing-Xi Guo Zhi-Li Liu Center for Ecological Research Key Laboratory of Sustainable ForestEcosystem Management-Ministry of EducationNortheast Asia Biodiversity Research CenterNortheast Forestry UniversityHarbin 150040HeilongjiangChina School of Forest Resources and Conservation University of FloridaGainesvilleFLUSA

The variation and correlation of leaf economics and vein traits are crucial for predicting plant ecological strategies under different environmental ***,correlations between these two suites of traits and abiotic factors such as soil water and nitrogen content remain *** measured leaf economics and vein traits as well as soil water and nitrogen content for two different shade-tolerant species(Betula platyphylla and Acer mono)in four mixed broadleaved-Korean pine(Pinus koraiensis)forests along a latitudinal gradient in Northeast *** found that leaf economics traits and vein traits were decoupled in shade-intolerant species,Betula platphylla,but significantly coupled in a shadetolerant species,*** found stronger correlations among leaf traits in the shade tolerant species than in the shade intolerant ***,leaf economic traits were positively correlated with the soil water gradient for both species,whereas vein traits were positively correlated with soil water gradient for the shade intolerant species but negatively correlated in the shade tolerant *** economic traits were positively correlated with soil nitrogen gradient in shade intolerant species but not correlated in shade tolerant species,vein traits were negatively correlated with soil nitrogen gradient in shade tolerant species but not correlated in shade intolerant *** study provides evidence for distinct correlations between leaf economics and vein traits and local abiotic factors of species differing in light *** recommend that the ecological significance of shade tolerance be considered for species when evaluating ecosystem functions and predicting plant responses to environmental changes.

关键词： Leaf trait multidimensionality Economics traits Vein traits Soil water content Soil total nitrogen shade tolerance

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Effects of light availability on leaf attributes and seedling growth of four tree species in tropical dry forest

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Ecological Processes 2020年第1期9卷 17-32页

作者： Sachchidanand Tripathi Rahul Bhadouria Pratap Srivastava Rajkumari S.Devi Ravikant Chaturvedi A.S.Raghubanshi Ecosystems Analysis Laboratory Department of BotanyInstitute of ScienceBanaras Hindu UniversityVaranasi 221005India Department of Botany Deen Dayal Upadhyaya CollegeUniversity of DelhiNew Delhi 110078India Natural Resource Management Laboratory Department of BotanyUniversity of DelhiNew Delhi 110007India Shyama Prasad Mukherjee Post-graduate College University of AllahabadAllahabad 211013India Xishuangbanna Tropical Botanical Garden Chinese Academy of SciencesYunnan 666303China Institute of Environment and Sustainable Development(IESD) Banaras Hindu UniversityVaranasi 221005India

Background:In tropical dry forests,variation in understory light availability due to season and canopy tree density could be a governing factor in establishment and growth of tree *** with varying life history traits are expected to respond differentially to such *** investigated the response of seedlings of four tree species in a tropical day forest in relation to spatiotemporal variability of *** attempt to explore the role of leaf attributes in explaining intra-and inter-specific variations in relative growth *** study sites,each with three contrasting canopy conditions,were selected along a soil moisture *** of four tree species(viz.,Acacia catechu,Bridelia retusa,Lagerstroemia parviflora,and Shorea robusta),varying in life history traits,were monitored for seasonal variations in growth traits across canopy condition and sites for 2 ***:We observed a larger variation in leaf attributes for pioneer *** showed highest mean values for leaf dry matter content,leaf nitrogen concentration,leaf phosphorus concentration,net stomatal conductance,net photosynthetic rate,and relative growth rate in high light *** and *** demonstrated highest mean values for all the leaf attributes(except leaf dry matter content)in low light ***,intermediate values for leaf attributes were observed in *** which preferred moderate light ***:Seasonal variations in light availability at the forest floor appear to play an important role in the establishment and growth of tree seedlings in seasonal dry *** attributes can be used to explain intra-and inter-specific variation in response to light *** attributes in combinations can be used to predict relative growth rate of tree species in tropical dry environment,which apart from soil moisture is also determined by light availability due to seasonal changes and canopy tree density.

关键词： Tropical dry forest Tree seedlings Light intensity Leaf attributes Pioneer species shade tolerance

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Height growth, diameter-height relationships and branching architecture of Pinus massoniana and Cunninghamia lanceolata in early regeneration stages in Anhui Province, eastern China: effects of light intensity and regeneration mode

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Forestry Studies in China 2011年第1期13卷 1-12页

作者： CHENG Xi-ping Umeki KIYOSH Honjo TSUYOSHI SHAO Peng-yue Graduate School of Horticulture Chiba University Matsudo 648 Matsudo Chiba 271-8510 Japan Forestry Bureau of Qimen County Huangshan 245500 P. R. China

To determine the growth strategies during early regeneration stages of two major coniferous species （Pinus massoniana and Cunninghamia lanceolata） in a secondary mixed coniferous forest in the Huangshan region of Anhui Province, eastern China, we examined height growth, diameter-height relationship and the relationship between main stem and lateral branch elongation in saplings, with a particular focus on the effects of light intensity and regeneration mode （seedlings versus sprouts）. When light intensity was sufficiently high, the extension growth of main stems was greater and more positively related to initial size for P. massoniana than for C. lanceolata. The slenderness of the stem form increased in the following order： C. lanceolata seedlings 〈 P. massoniana seedlings 〈 C. lanceolata sprouts. P. massoniana became less slender with increasing light intensity. P. massoniana had shorter branches than C. lanceolata given the same main stem elongation. Growth allocation depended more strongly on light intensity for P. massoniana than for C. lanceolata, with more growth allocated to the main stem under dark conditions. These results suggest that P. massoniana is a typical shade avoider; this species gives priority to extension growth of the main stem, especially when it is shaded. In contrast, C. lanceolata is a shade tolerator; this species allocates more biomass to radial growth of its main stems and to extension growth of branches. Based on these results, the ecological characteristics of P. massoniana and C. lanceolata and the roles of seedlings and sprouts are discussed in relation to stand dynamics of the mixed forests of P. massoniana and C. lanceolata in eastern China.

关键词： growth strategy seedlings shade tolerance shade avoidance sprouts

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Effects of Shading Treatment on the Growth of Bischofia javanica Seedlings

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Agricultural Science & Technology 2017年第5期18卷 952-956页

作者：於艳萍毛立彦宾振钧唐春红王凌晖时鹏涛郝小玲广西大学广西南宁530004 广西壮族自治区亚热带作物研究所广西南宁530001 广西壮族自治区国有维都林场广西来宾546100

With annual Bischofia javanica seedlings as experimental material, the plasticity and comprehensive evaluation methods were employed to investigate the effects of different shading degrees （100% NS （natural sunshine）, 41.3% NS, 14.6% NS and 3.6% NS） on B. javanica seedlings growth, so as to obtain the shade toler- ance in B. javanica. The results showed that with the shading degree increasing, the seedling height increment, diameter increment, leaf area, fresh weights （above- ground part, underground part and whole plant） and dry weights （aboveground part, underground part and whole plant） of B. javanica seedlings all increased first and then decreased, and reached peak values under 41.3% NS, while the total root length, average root diameter, total surface area, total root volume and total root number all presented a decreasing trend. Also the comprehensive evaluation by subordinate function value method and plasticity analysis were carried out on these growth indexes. It was concluded that B. javanica seedlings have medium shade tol- erance from the comDrehensive analysis of growth indexes.

关键词： Bischofia javanica seedlings shade tolerance Growth

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Invading populations of Ardisia crenata in Florida *** native populations in SW Japan:implications of the cultivar origin of many invasive plants

Invading populations of Ardisia crenata in Florida *** nativ...

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北京生物入侵国际研讨会

作者： Kitajima,Kaoru Alison M.Fox Department of Botany University of FloridaGainesvilleFlorida 32611-0856USA Department of Agronomy University of FloridaGainesvilleFlorida32611-0500USA.

Ardisia crenata(Myrsinaceae) is a shade tolerant shrub that invades the understory of mesic hardwood forests in the SE United *** forms dense patches(up to 600 stems per m) and competitively displaces native understory plants including canopy tree seedlings by creating dense local *** invading populations are descendents of a common cultivar from Japan where

关键词： Ardisia crenata cultivar selection Japan Florida invasive plants seed size shade tolerance

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