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Linking leaf elemental traits to biomass across forest biomes in the Himalayas

Science China Earth Sciences 2024年第5期67卷 1518-1528页

作者： Nita DYOLA Eryuan LIANG Josep PEÑUELAS J.Julio CAMARERO shalik ram.sigdel Sugam ARYAL Wentao LIN Xiang LIU Yongwen LIU Xingliang XU Sergio ROSSI State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China Laboratoire sur lesécosystèmes terrestres boréaux Département des Sciences FondamentalesUniversitédu QuébecàChicoutimi555Boulevard de l′UniversitéChicoutimi(QC)G7H2B1Canada CSIC Global Ecology Unit CREAF-CSIC-UABBellaterraE-08193 CataloniaSpain CREAF Cerdanyola del VallèsE-08193 CataloniaSpain Instituto Pirenaico de Ecología(IPE-CSIC) Avenida Montañana 1005Zaragoza 50059Spain Friedrich-Alexander-Universität Erlangen-Nürnberg Institut für GeographieErlangen 91058Germany State Key Laboratory of Grassland Agro-Ecosystems College of EcologyLanzhou UniversityLanzhou 730000China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

Plants require a number of essential elements in different proportions for ensuring their growth and *** elemental concentrations in leaves reflect the functions and adaptations of plants under specific environmental ***,less is known about how the spectrum of leaf elements associated with resource acquisition,photosynthesis and growth regulates forest biomass along broad elevational *** examined the influence of leaf element distribution and diversity on forest biomass by analyzing ten elements(C,N,P,K,Ca,Mg,Zn,Fe,Cu,and Mn)in tree communities situated every 100 meters along an extensive elevation gradient,ranging from the tropical forest(80 meters above sea level)to the alpine treeline(4200 meters above sea level)in the Kangchenjunga Landscape in eastern Nepal *** calculated communityweighted averages(reflecting dominant traits governing biomass,i.e.,mass-ratio effect)and functional divergence(reflecting increased trait variety,i.e.,complementarity effect)for leaf elements in a total of 1,859 trees representing 116 *** increasing mass-ratio effect and decreasing complementarity in leaf elements enhance forest biomass accumulation.A combination of elements together with elevation explains biomass(52.2%of the variance)better than individual elemental trait diversity(0.05%to 21%of the variance).Elevation modulates trait diversity among plant species in biomass *** promotes biomass at lower elevations,but reduces biomass at higher elevations,demonstrating an interaction between elevation and *** interaction between elevation and mass-ratio effect produces heterogeneous effects on biomass along the elevation *** research indicates that biomass accumulation can be disproportionately affected by elevation due to interactions among trait diversities across vegetation *** higher trait variation enhances the adaptation of species to environmental changes,it reduces

关键词： Ecosystem function Elevational gradient Functional diversity Functional traits Leaf elements Niche complementarity

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互利作用促进了高山树线幼苗的存活

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Journal of Plant Ecology 2024年第3期17卷 115-127页

作者： Wensheng Chen Jiangrong Li Jesús Julio Camarero Huihui Ding Fangwei Fu Yueyao Li Xiangyu Zheng Xiaoxia Li Wei Shen shalik ram.sigdel Steven W.Leavitt Eryuan Liang Institute of Tibet Plateau Ecology Tibet Agricultural&Animal Husbandry UniversityNyingchi 860000China Key Laboratory of Forest Ecology in Tibet Plateau(Tibet Agricultural&Animal Husbandry University) Ministry of EducationNyingchi 860000China National Forest Ecosystem Observation&Research Station of Nyingchi Tibet Nyingchi 860000China Key Laboratory of Alpine Vegetation Ecological Security in Tibet Nyingchi 860000China Zhejiang Zhoushan Archipelago Observation and Research Station Zhejiang Tiantong Forest Ecosystem National Observation and Research Stationand Shanghai Key Lab for Urban Ecological Processes and Eco-RestorationSchool of Ecological and Environmental SciencesEast China Normal UniversityShanghai 200241China State Key Laboratory of Tibetan Plateau Earth System Resources and Environment(TPESRE)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China Instituto Pirenaico de Ecología(IPE-CSIC) Zaragoza 50059Spain Anhui Province Key Lab of Farmland Ecological Conservation and Pollution Prevention Key Laboratory of JiangHuai Arable Land Resources Protection and Eco-restorationMinistry of Natural ResourcesCollege of Resources and EnvironmentAnhui Agricultural UniversityHefei 230036China Laboratory of Tree-Ring Research University of ArizonaTucsonAZ 85721USA

高山树线被视为记录气候变化对树木和森林影响的生态监测器。迄今为止,大多数树线研究都集中在气候变化如何驱动树线动态的变化。然而,关于生物相互作用如何调节树线变化,特别是在树木更新这一树线动态的瓶颈方面,人们知之甚少。本研究... 详细信息

高山树线被视为记录气候变化对树木和森林影响的生态监测器。迄今为止,大多数树线研究都集中在气候变化如何驱动树线动态的变化。然而,关于生物相互作用如何调节树线变化,特别是在树木更新这一树线动态的瓶颈方面,人们知之甚少。本研究假设种间和种内促进作用决定了高山树线树苗的定居和存活。为了验证这一假设,我们在青藏高原东南部的色季拉山高山树线交错区(海拔4300–4500 m)的3个生长生境(林冠内、林冠外和草地)中共计移植了630株不同年龄(4–6年、7–9年和10–15年)的急尖长苞冷杉(Abies georgei ***)幼苗,连续3年监测了移植后幼苗的微气候、高度生长、死亡率和叶片功能性状。结果发现,叶片功能性状的变化是由微气候驱动的。移植后,叶片可溶性糖和淀粉浓度以及C:P比增加,而叶面积减小。幼苗的资源利用逐渐转向更保守的策略,其背后机制主要受到了生理性状(非结构性碳水化合物和植物养分)的介导。同时,由结构方程模型发现太阳辐射、温度和水分条件在植物相互作用下,通过介导叶片形态性状的变化最终影响了幼苗的死亡率和年生长。上述研究结果表明,植物间的互利作用通过改变太阳辐射和叶片功能性状,最终在决定幼苗生长和存活上起到至关重要的作用,同时也为理解全球气候变化背景下高山树线动态变化的驱动机制提供了新的见解。

关键词：青藏高原移栽实验叶片功能性状太阳辐射

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喜马拉雅山不同森林群落主要树种叶片元素性状与生物量之间的关系

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中国科学：地球科学 2024年第5期54卷 1544-1555页

作者： Nita DYOLA 梁尔源 Josep PEÑUELAS JJulio CAMARERO shalik ram.sigdel Sugam ARYAL 林文涛刘向刘永稳徐兴良 Sergio ROSSI 中国科学院青藏高原研究所青藏高原地球系统与资源环境全国重点实验室北京100101 中国科学院大学北京100049 Laboratoire sur lesécosystèmes terrestres boréaux Département des Sciences FondamentalesUniversitédu QuébecàChicoutimi555Boulevard de l′UniversitéChicoutimi(QC)G7H2B1Canada CSIC Global Ecology Unit CREAF-CSIC-UABBellaterraE-08193 CataloniaSpain CREAF Cerdanyola del VallèsE-08193 CataloniaSpain Instituto Pirenaico de Ecología(IPE-CSIC) Avenida Montañana 1005Zaragoza 50059Spain Friedrich-Alexander-Universität Erlangen-Nürnberg Institut für GeographieErlangen 91058Germany 兰州大学生态学院草种创新与草地农业生态系统全国重点实验室兰州730000 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室北京100101

植物需要多种基本元素调节并保持其特定比例以维持生长发育,叶片元素含量反映了植物的功能及其对环境的适应性.然而,在森林海拔梯度上,我们对于资源获取、光合作用和生长相关的叶片元素如何调节森林生物量仍知之甚少.本研究在喜马拉雅... 详细信息

植物需要多种基本元素调节并保持其特定比例以维持生长发育,叶片元素含量反映了植物的功能及其对环境的适应性.然而,在森林海拔梯度上,我们对于资源获取、光合作用和生长相关的叶片元素如何调节森林生物量仍知之甚少.本研究在喜马拉雅山干城章嘉峰地区沿热带森林(海拔80m)至高山树线(海拔4200m)设置海拔梯度样带,每间隔海拔100m设置一个样点,对116个树种的1859个个体测定了叶片中10种元素(C、N、P、K、Ca、Mg、Zn、Fe、Cu和Mn)的含量,通过计算叶片元素含量的群落加权平均值(反映优势物种的性状优势度,表征质量比效应)和功能离散度(反映物种在生态位空间内的聚集或者离散程度,表征互补效应),探究叶片元素含量及其离散程度沿海拔梯度分异特征,解析其对森林群落生物量的影响.研究结果表明,较强的叶片元素质量比效应和较弱的互补效应有利于森林群落生物量的积累.叶片元素性状多样性与海拔的共同作用对生物量的解释量(解释方差:52.2%)高于元素性状多样性的解释量(解释方差:0.05%~21%).海拔调节了树种性状多样性在生物量积累中的作用,互补效应在低海拔和高海拔地区对生物量的影响分别体现为积极和消极作用,这表明海拔和互补效应之间也存在交互作用.此外,海拔和质量比效应的交互作用对海拔梯度上生物量的影响也存在异质性.本研究表明,不同森林群落生物量的积累可能受到由海拔调控的性状多样性的影响.尽管较高的性状分异不利于生物量的积累,但能增强高海拔地区树种对胁迫环境的适应性.

关键词：生态系统功能海拔梯度功能多样性功能性状叶片元素生态位互补

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Growth response of Abies spectabilis to climate along an elevation gradient of the Manang valley in the central Himalayas

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Journal of Forestry Research 2020年第6期31卷 2245-2254页

作者： Samresh Rai Binod Dawadi Yafeng Wang Xiaoming Lu Huang Ru shalik ram.sigdel Key Laboratory of Alpine Ecology Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101People’s Republic of China University of Chinese Academy of Sciences Beijing 100000People’s Republic of China Central Department of Hydrology and Meteorology Tribhuvan UniversityKathmanduNepal College of Biology and the Environment Nanjing Forestry UniversityNanjing 210037People’s Republic of China

The Himalayas are characterized by a broad gradient of bioclimatic zones along their ***,less is known how forest growth responds to climatic change along *** this study,four standard treering width chronologies of Himalayan fir(Abies spectabilis)were developed,spanning 142–649 years along an elevation gradient of 3076–3900 m *** component analysis classified the four chronologies into two groups;the ones at lower elevations(M1 and M2)and higher elevations(M3 and M4)show two distinct growth *** growth is limited by summer(June–August)precipitation at M3,and by precipitation during spring(March–May)and summer at *** is limited by spring temperatures and winter precipitation(December–February)at ***-ring width chronologies also significantly correlate with winter and spring Palmer Drought Severity Index(PDSI)at M1,and with summer PDSI at M3 and ***,Himalayan fir growth at high elevations is mainly limited by moisture stress rather than by low ***,the occurrence of missing rings coincides with dry periods,providing additional evidence for moisture limitation of Himalayan fir growth.

关键词： Climate signals Tree-ring width Abies spectabilis Radial growth Precipitation Manang valley Himalayas

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Strong link between large tropical volcanic eruptions and severe droughts prior to monsoon in the central Himalayas revealed by tree-ring records

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Science Bulletin 2019年第14期64卷 1018-1023页

作者： Eryuan Liang Binod Dawadi Neil Pederson Shilong Piao Haifeng Zhu shalik ram.sigdel Deliang Chen Key Laboratory of Alpine Ecology Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100101 China Center for Excellence in Tibetan Plateau Earth Sciences Chinese Academy of Sciences Beijing 100101 China Central Department of Hydrology and Meteorology Tribhuvan University Kathmandu Nepal Harvard Forest Harvard University Petersham MA 01366 USA College of Urban and Environmental Sciences Peking University Beijing 100871 China Key Laboratory of Tibetan Environment Changes and Land Surface Processes Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing 100101 China Regional Climate Group Department of Earth Sciences University of Gothenburg Gothenburg 40530 Sweden

Large tropical volcanic eruptions can cause short-term global cooling. However, little is known whether large tropical volcanic eruptions, like the one in Tambora/Indonesia in 1815, cause regional hydroclimatic anomalies. Using a tree-ring network of precisely dated Himalayan birch in the central Himalayas, we reconstructed variations in the regional pre-monsoon precipitation back to 1650 CE. A superposed epoch analysis indicates that the pre-monsoon regional droughts are associated with large tropical volcanic eruptions, appearing to have a strong influence on hydroclimatic conditions in the central Himalayas. In fact, the most severe drought since 1650 CE occurred after the Tambora eruption. These results suggest that dry conditions prior to monsoon in the central Himalayas were associated with explosive tropical volcanism. Prolonged La Ni?a events also correspond with persistent pre-monsoon droughts in the central Himalayas. Our results provide evidence that large tropical volcanic eruptions most likely induced severe droughts prior to monsoon in the central Himalayas.

关键词： Tree ring Drought Tropical volcanic eruptions Central Himalayas

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No benefits from warming even for subnival vegetation in the central Himalayas

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Science Bulletin 2021年第18期66卷 1825-1829,M0003页

作者： shalik ram.sigdel Jayram Pandey Eryuan Liang Sher Muhammad Flurin Babst Steven W.Leavitt Miaogen Shen Haifeng Zhu Franco Salerno Shilong Piao J.Julio Camarero Josep Penuelas State Key Laboratory of Tibetan Plateau Earth System Resources and Environment(TPESRE)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China International Centre for Integrated Mountain Development(ICIMOD) KathmanduNepal Institute of International Rivers and Eco-security Yunnan UniversityKunming 650500China School of Natural Resources and the Environment University of ArizonaTucsonAZ 85721USA Laboratory of Tree-Ring Research University of ArizonaAZ 85721USA Water Research Institute-National Research Council(IRSA-CNR) Brugherio 20861Italy Instituto Pirenaico de Ecología(IPE-CSIC) Zaragoza 50080Spain CSIC Global Ecology Unit CREAF-CSIC-UABCerdanyola del VallesCatalonia 08913Spain CREAF Cerdanyola del VallesCatalonia 08913Spain

普遍认为变暖有利于高山植被生态系统,并已经导致冰缘植物向高海拔的扩张.珠峰山谷金字塔气象站(海拔5050 m)1994~2018的气象记录显示,高海拔山区呈显著的暖干化趋势.然而,我们依然不清楚暖干化是否对冰缘植被更新和分布造成显著影响?... 详细信息

普遍认为变暖有利于高山植被生态系统,并已经导致冰缘植物向高海拔的扩张.珠峰山谷金字塔气象站(海拔5050 m)1994~2018的气象记录显示,高海拔山区呈显著的暖干化趋势.然而,我们依然不清楚暖干化是否对冰缘植被更新和分布造成显著影响?本研究在喜马拉雅山中段3个山谷建立了8块(30 m×120 m)滇藏方枝柏(Juniperus indica)和高山柏(Juniperus squamata)灌木线样地(海拔介于4344~5074 m之间).样地调查揭示,自20世纪90年代之前所有样地种群更新呈增加的趋势,然而90年代以来更新持续下降.种群更新与春季、夏季温度之间呈现显著的负相关关系,暗示了暖干化加剧了水分胁迫,并限制了种群的更新.另外,近60年来所有灌木线位置稳定.近30年遥感数据也证实,研究区冰缘植被无变绿趋势,甚至出现2%-6%的植被生长减弱现象.因此,进一步研究应该探讨冰缘植被生长减弱对喜马拉雅山区水循环和生物多样性的影响.

关键词：生物多样性喜马拉雅山区高海拔山区种群更新植被生态系统植被生长气象记录

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Comparative study between intramedullary interlocking nailing and minimally invasive percutaneous plate osteosynthesis for distal tibia extra-articular fractures

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Chinese Journal of Traumatology 2022年第2期25卷 90-94页

作者： Kapil Mani KC Bandhu ram Pangeni Suman Babu Marahatta Arun sigdel Amuda KC Civil Service Hospital KathmanduNepal Nepalese Army Institute of Health Sciences KathmanduNepal

Purpose:Treatment of distal tibia fractures poses significant challenge to orthopedic surgeon because of poor blood supply and paucity of soft tissue *** is considerable controversy regarding the superior option of treatment for distal tibia fracture between the minimally invasive percutaneous plate osteosynthesis(MIPPO)technique and intramedullary interlocking(IMIL)nailing for extra-articular distal tibia *** aim of our study is to compare the functional outcome between the two treatment ***:This was the prospective comparative study of 100 patients with distal third tibia fractures divided into two *** first group of patients were treated with MIPPO technique while the second group of patients were managed by IMIL *** were followed up in outpatient department to assess the functional outcomes,malunion,delayed union,nonunion,superficial and deep infection between the two *** analyses were performed using the SPSS software(version 16.0).Results:Average malunion(degrees)in the MIPPO group was 5(3—7)±1.41 vs.10.22(8—14)±2.04 in the IMIL group(p=0.001).Similarly postoperative knee pain in the IMIL group was 10%vs.2%in the MIPPO group(p=0.001).In terms of superficial infection and nonunion,the results were 8%vs.4%and 2%vs.6%for the MIPPO and IMIL group,respectively(p=0.001).Conclusion:Both procedures have shown the reliable method of fixation for distal extra-articular tibia fractures preserving the soft tissue,bony vascularity and fracture hematoma that provide a favourable biological environment for fracture *** the results of the study,we have slightly more preference for the MIPPO technique.

关键词： Distal tibia fractures IMIL nailing Maiunion MIPPO technique

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揭示生物因子调控喜马拉雅高山树线变化速率

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高科技与产业化 2020年第6期 79-79页

作者： shalik ram.sigdel 梁尔源中国科学院青藏高原研究所中科院青藏高原所

基于喜马拉雅山中段树线样地网络,我所生态系统格局与过程团队梁尔源研究员及合作者最新研究揭示,种内（同种树木内部之间的竞争和互利）关系也是调控喜马拉雅山中段树线爬升速率的重要因子。进一步研究表明,温度-降水交互作用影响树木...

基于喜马拉雅山中段树线样地网络,我所生态系统格局与过程团队梁尔源研究员及合作者最新研究揭示,种内（同种树木内部之间的竞争和互利）关系也是调控喜马拉雅山中段树线爬升速率的重要因子。进一步研究表明,温度-降水交互作用影响树木幼苗集群分布状态,进而调控树线爬升速率。

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