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The unimodal latitudinal pattern of K,Ca and Mg concentration and its potential drivers in forest foliage in eastern China

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Forest Ecosystems 2024年第3期11卷 318-328页

作者： Zhijuan Shi Sining Liu Yahan Chen Dongdong Ding Wenxuan Han Key Laboratory of Plant-Soil Interactions Ministry of EducationCollege of Resources and Environmental SciencesChina Agricultural UniversityBeijing100193China Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province&National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River College of ForestrySichuan Agricultural UniversityChengdu611130China Institute of Botany Chinese Academy of SciencesBeijing100093China

Potassium(K),calcium(Ca),and magnesium(Mg)are essential elements with important physiological functions in *** studies showed that leaf K,Ca,and Mg concentrations generally increase with increasing ***,recent meta-analyses suggested the possibility of a unimodal pattern in the concentrations of these elements along latitudinal *** authenticity of this unimodal latitudinal pattern,however,requires validation through large-scale field experimental data,and exploration of the underlying mechanisms if the pattern is ***,we collected leaves of common species of woody plants from 19 montane forests in the north-south transect of eastern China,including 322 species from 160 genera,67 families;and then determined leaf K,Ca,and Mg concentrations to explore their latitudinal patterns and driving *** results support unimodal latitudinal patterns for all three elements in woody plants across eastern China,with peak values at latitude 36.5±1.0°*** shift of plant-functional-type compositions from evergreen broadleaves to deciduous broadleaves and to conifers along this latitudinal span was the key factor contributing to these *** factors,mainly temperature,and to a lesser extent solar radiation and precipitation,were the main environmental *** factors,by altering the composition of plant communities and regulating plant physiological activities,influence the latitudinal patterns of plant nutrient *** findings also suggest that high leaf K,Ca,and Mg concentrations may represent an adaptive strategy for plants to withstand water stress,which might be used to predict plant nutrient responses to climate changes at large scales,and broaden the understanding of biogeochemical cycling of K,Ca,and Mg.

关键词： Potassium Calcium Magnesium mid-latitudes Latitudinal pattern Plant functional type Water stress Woody plant

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Spatial-Temporal Variations of Arctic Amplification and Their Linkage with the Arctic Oscillation

Spatial-Temporal Variations of Arctic Amplification and Thei...

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第33届中国气象学会年会

作者：王砚硕黄菲樊婷 Physical Oceanography Laboratory and Key Laboratory of Ocean-Atmospheric Interaction and Climate in Universities of Shandong Ocean University of China

The Arctic near-surface air temperatures are increasing more than twice as fast as the global average—a feature known as Arctic Amplification（AA）.A modified AA index is constructed in this paper to emphasize the contrast of warming rate between polar and mid-latitude regions,as well as the spatial and temporal characteristics of AA and their influence on atmospheric circulation over the Northern *** show that AA has a pronounced annual *** positive and negative phase activities are the strongest in autumn and winter,the weakest in *** experiencing a remarkably decadal shift from negative to positive phase in the early global warming hiatus period,the AA enters a state of being enlarged continuously,and the decadal regime shift of AA at about 2002 is affected mainly by decadal shift in *** terms of spatial distribution,AA has maximum warming near the surface in almost all seasons except in *** of 20°N,AA in autumn has a significant influence on the atmospheric circulation in the following *** reason may be that the autumn AA increases the amplitude of planetary waves,slows the wave speeds and weakens upper-level zonal winds through the thermal wind relation,thus influencing surface air temperature in the following *** AA correlates to negative phase of the Arctic Oscillation（AO）and leads AO by 0-3 months within the period ***,weaker relationship between them is indistinctive after the decadal shift of AA.

关键词： Arctic amplification Arctic oscillation decadal shift mid-latitudes

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