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The effect of growth conditions on the relationship between fine root and foliage biomass

Journal of Forestry Research 2022年第5期33卷 1585-1591页

作者： Yury Karpechko Anna Karpechko Andrej Tuyunen Forest Research Institute of the Karelian Research Centre of the Russian Academy of Sciences 11 Pushkinskaya St.PetrozavodskKareliaRussia 185910

This article examines the physiological relationships between fine roots and foliage, and how their biomass ratio correlates with changes in stand quality class. The biomass of fine roots ≤ 3 mm in diameter of spruce stands in the Republic of Karelia (Northwest Russia) was determined by the soil monolith method. Foliage biomass was calculated using a previously designed technique from the standing stock, average height and quality class of the stand. A relation between fine-root: foliage biomass ratio and stand quality class (representing soil fertility) has been established. The closest correlation between fine-root: foliage biomass ratio and stand quality based on soil fertility was for the 1-2 mm root fraction. Analysis of the water flux balance in the trees revealed a correlation between fine-root: foliage ratio and the ratio of the specific volume of transpiration by the stand to the specific volume of water uptake from the soil by roots. Theoretical explanations for the decrease in fine-root: foliage biomass ratios with increasing stand quality class are offered.

关键词： fine-root biomass Foliage biomass Stand quality class Soil fertility

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Early positive effects of tree species richness on soil organic carbon accumulation in a large-scale forest biodiversity experiment

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Journal of Plant Ecology 2019年第5期12卷 882-893页

作者： Yin Li Helge Bruelheide Thomas Scholten Bernhard Schmid Zhenkai Sun Naili Zhang Wensheng Bu Xiaojuan Liu Keping Ma State Key Laboratory of Vegetation and Environmental Change Institute of Botanythe Chinese Academy of SciencesBeijing 100093China University of Chinese Academy of Sciences Beijing 100049China Institute of Biology/Geobotany and Botanical Garden Martin Luther University Halle-WittenbergAm Kirchtor 106108 HalleGermany German Centre for Integrative Biodiversity Research(iDiv)Halle-Jena-Leipzig Deutscher Platz 5eD-04103 LeipzigGermany Department of Geosciences Soil Science and GeomorphologyEberhard Karls University TübingenRümelinstrasse 19-2372070 TübingenGermany Department of Geography University of ZürichWinterthurerstrasse 190CH-8057 ZürichSwitzerland Research Institute of Forestry Chinese Academy of ForestryBeijing 100091China College of Forestry Jiangxi Agricultural UniversityNanchang 330045China

Aims tree species richness has been reported to have positive effects on aboveground biomass and productivity,but little is known about its effects on soil organic carbon(SOC)*** to close this gap,we made use of a large biodiversity-ecosystem functioning experiment in subtropical china(BEF-china)and tested whether tree species richness enhanced SOC *** 2010 and 2015,vertically layered soil samples were taken to a depth of 30 cm from 57 plots ranging in tree species richness from one to eight *** squares-based linear models and analysis of variance were used to investigate tree diversity *** equation modeling was used to explore hypothesized indirect relationships between tree species richness,leaf-litter biomass,leaf-litter carbon content,fine-root biomass and SOC *** Findings Overall,SOC content decreased by 5.7 and 1.1 g C kg^(-1) in the top 0-5 and 5-10 cm soil depth,respectively,but increased by 1.0 and 1.5 g C kg^(-1) in the deeper 10-20 and 20-30 cm soil depth,*** SOC content to SOC stocks using measures of soil bulk density showed that tree species richness did enhance SOC accumulation in the different soil *** effects could only to some extent be explained by leaf-litter biomass and not by fine-root *** findings suggest that carbon storage in new forests in china could be increased by planting more diverse stands,with the potential to contribute to mitigation of climate warming.

关键词： BEF-china diversity fine-root biomass leaf-litter biomass soil carbon accumulation

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Positive effects of tree species richness on fine-root production in a subtropical forest in SE-China

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Journal of Plant Ecology 2017年第1期10卷 146-157页

作者： Zhenkai Sun Xiaojuan Liu Bernhard Schmid Helge Bruelheide Wensheng Bu Keping Ma State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of Sciences20 NanxincunXiangshanBeijing 100093China College of Life Sciences University of Chinese Academy of SciencesNo.19 Yuquan RoadShijingshan DistrictBeijing 100049China Department of Evolutionary Biology and Environmental Studies University of ZürichWinterthurerstr.1908057 ZürichSwitzerland Institute of Biology/Geobotany and Botanical Garden Martin Luther University Halle WittenbergAm Kirchtor 106120 HalleGermany German Centre for Integrative Biodiversity Research(iDiv)Halle-Jena-Leipzig Deutscher Platz 5e04103 LeipzigGermany

Aims fine roots play an important role in the biogeochemical cycles of terrestrial ecosystems and are vital for understanding forest ecosystem functioning and *** plant species diversity has been largely reported to increase aboveground community biomass,but how biodiversity affects fine-root production and the related mechanisms in forests remain *** this study,we aim to answer two questions:(i)does fine-root production increase with tree species richness?(ii)Can this effect be explained by niche complementarity among species?Methods We analyzed data from a large forest biodiversity experiment(BEF-China)with 5-year-old ***-root growth was measured as standing biomass and annual fine-root regrowth was estimated using ingrowth ***,relative yield was calculated to test whether over-or under-yielding occurred when mixtures were compared with the average monoculture of the species included in the *** calculated functional diversity for fine-root(≤2 mm in diameter)traits by Rao’s quadratic entropy index for each species *** effects of manipulated tree species richness and identity on fine-root traits were analyzed with linear mixed-effects *** models were also used to test the relationships between tree species richness and fine-root standing biomass,annual regrowth and vertical *** Findings fine roots of more than one species were found in half of the soil cores in mixtures indicating that belowground interactions in these young forest stands occurred much earlier than canopy *** found significant differences among species in fine-root traits such as diameter and specific root length(SRL),which suggested different resource-use strategies and niche partitioning among *** fine-root diameter of species ranged from 0.31 to 0.74 mm,mean SRL ranged from 12.43 m·g^(−1)to 70.22 m·g^(−1)and mean vertical distribution indexβranged from 0.68 to *** was a significant positive re

关键词： Biodiversity fine-root biomass fine-root regrowth niche complementarity over-yielding

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