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Modelling the response of larch growth to age,density,and Elevation and the implications for multifunctional management in northwest China

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林业研究:英文版 2023年第5期34卷 1423-1436页

作者： Ao Tian Yanhui Wang Ashley A.Webb Pengtao Yu Xiao Wang Zebin Liu Institute of Mountain Resource of Guizhou Province Guiyang 550001People’s Republic of China Ecology and Nature Conservation Institute Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland AdministrationChinese Academy of ForestryBeijing 100091People’s Republic of China WaterNSW TamworthNSWAustralia

Plantations of Rupprecht's larch(Larix principis-rupprechtii)have been widely established in the drylands of northwest and north China under traditional fastgrowing plantation management strategies.These strategies and the long-term logging ban have led to over-populated stands with lower structural and functional stability,less economic benefit and higher water consumption.To guide the sustainable management of larch plantations,field surveys and historical data compilation were undertaken in the Liupan Mountains of northwest China.The main influencing factors(stand structure and site condition)and their effects on mean tree height,mean DBH and timber volumes were determined based on up-boundary line analysis.Tree growth models coupling the effects of tree age,stand density,and Elevation were established.Both height and DBH markedly increased initially and then slowly with tree age,decreased with stand density,and showed unimodal change with Elevation.The coupled growth models accounted for72-78%of the variations in tree height,DBH and timber growth.Recommendations for future plantation management are:(1)prolong the rotation to at least 60 years to produce large-diameter,high-quality timber and maintain greater carbon stocks;(2)zone the target functions of stands by Elevation;and,(3)reduce stand density for balanced supply of multiple ecosystem services.The growth models developed can predict growth response of larch plantations to density alteration under given ages and Elevations,and assist the transformation from traditional management for maximum timber production to site-specific and multifunctional management with longer rotations and moderate tree density.

关键词： Larch plantations Coupled growth model Influencing factors Age Density Elevation

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The storage and utilization of carbohydrates in response to Elevation mediated by tree organs in subtropical evergreen broad-leaved forests

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Forest Ecosystems 2024年第1期11卷 52-61页

作者： Bin Xu Xueli Jiang Yingying Zong G.Geoff Wang Fusheng Chen Zhenyu Zhao Xiangmin Fang Key Laboratory of National Forestry and Grassland Administration on Forest Ecosystem Protection and Restoration of Poyang Lake Watershed College of ForestryJiangxi Agricultural UniversityNanchang330045China Jiulianshan National Observation and Research Station of Chinese Forest Ecosystem College of ForestryJiangxi Agricultural UniversityNanchang330045China Department of Forestry and Environmental Conservation Clemson UniversityClemsonSC29634USA

Global climate change can affect tree growth and carbon sink function by influencing plant carbohydrate synthesis and utilization,while Elevation can be used as an ideal setting under natural conditions to simulate climate change effects.The effect of Elevation on tree growth may depend on organ type.However,the allocation patterns of nonstructural and structural carbohydrates(NSCs and SCs,respectively)in different tree organs and their response to Elevation remain unclear.We selected four dominant tree species,Schima superba,Castanopsis eyrei,Castanopsis fargesii and Michelia maudiae,along an Elevation gradient from 609 to 1,207 m in subtropical evergreen broad-leaved forests and analyzed leaf,trunk,and fine root NSCs,carbon(C),nitrogen(N)and phosphorus(P)concentrations and the relative abundance of SCs.Leaf NSCs increased initially and then decreased,and trunk NSCs increased with increasing Elevation.However,root NSCs decreased with increasing Elevation.The relative abundance of SCs in leaves and trunks decreased,while the relative abundance of root SCs increased with increasing Elevation.No significant correlations between SCs and NSCs in leaves were detected,while there were negative correlations between SCs and NSCs in trunks,roots,and all organs.Hierarchical partitioning analysis indicated that plant C/N and C/P were the main predictors of changes in SCs and NSCs.Our results suggest that tree organs have divergent responses to Elevation and that increasing Elevation will inhibit the aboveground part growth and enhance the root growth of trees.A tradeoff between the C distribution used for growth and storage was confirmed along the Elevation gradient,which is mainly manifested in the"sink"organs of NSCs.Our results provide insight into tree growth in the context of global climate change scenarios in subtropical forest ecosystems.

关键词： Nonstructural carbohydrates Structural carbohydrates Elevation Subtropical evergreen broad-leaved forests Tree organs

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Abdominal Grey Color Variation along an Elevation Gradient in a Lizard

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Asian Herpetological Research 2023年第2期14卷 156-166页

作者： Zian WEI Jiasheng LI Tao WANG Minglu YANG Yuanting JIN College of Life Sciences China Jiliang UniversityHangzhou 310018ZhejiangChina College of Life Sciences and Medicine Zhejiang Sci-Tech UniversityHangzhou 310018ZhejiangChina College of Life Sciences Northwest Normal UniversityLanzhou 730070GansuChina

Color variation among populations is thought to be either due to genetic variation or phenotype plasticity.In this study,we found that an agamid lizard,Phrynocephalus theobaldi,inhabiting Elevations greater than any other reptile,displayed a significantly darker spotted marking on the central ventral abdomen in higher populations than in lower populations.The grey spotted area only occurred in Elevations>4200 m,and also increased with increased Elevation.The ratio of the size of the dark colored area to the degree of skin luminance/reflectance was used to test whether the lizard has a larger and darker spotted area at higher Elevations.This ratio was significantly positively associated with Elevation rather than substrate color.The lizard did not display sexual difference in this phenotype.Temperature had a significant influence on the brightness of central abdomen,but temperature-related plasticity of this trait was much smaller than the magnitude of the difference between higher(>4200 m)and lower populations(<4200 m).Common garden experiments showed that genetic inheritance,rather than phenotype plasticity,played a dominant role in this variation.Our research addressed the darkness of a body region that is rarely analyzed because it is shielded from direct insolation.The idea that ventral color could be related to thermoregulation is shown to be worthy of further research.

关键词： central abdomen color variation common garden experiments Elevation reptile temperature

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Impacts of CO2 Elevation on the physiology and seed quality of soybean

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Plant Diversity 2020年第1期42卷 44-51页

作者： Guowei Zheng Jia Chen Weiqi Li College of Chinese Material Medica Yunnan University of Chinese MedicineKunmingYunnanPeople's Republic of China Germplasm Bank of Wild Species Kunming Institute of BotanyChinese Academy of SciencesKunmingYunnanPeople's Republic of China Yunnan Key Laboratory of Dai and Yi Medicines Yunnan University of Chinese MedicineKunmingYunnanPeople's Republic of China

Understanding the responses of crops to elevated atmospheric carbon dioxide concentrations(E[CO2])is very important in terms of global food supplies.The present study investigates the effects of CO2 enrichment(to 800μmol mol^-1)on the physiology of soybean plants and the nutritional value of their seeds under growth chamber conditions.The photosynthesis of soybean was significantly promoted by E[CO2]at all growth stages,but leaf area and specific leaf weight were not affected.The levels of mineral elements in the leaves decreased under EICO2J.The soil properties after soybean cultivation under E[CO2]were not affected,except for a decrease in available potassium.Moreover,the levels of soluble sugars in the seeds were not affected by E[CO2].but the levels of natural antioxidants decreased.In addition,the level of oleic acid decreased under E[CO2].However,levels of fatty acid peroxidation and saturation were maintained.In conclusion.E[CO2] appears to have positive effects on the growth of cultivated soybean plants,but its influence on the nutritional values of soybean seeds is complex.Copyright?2019 Kunming Institute of Botany.Chinese Academy of Sciences.

关键词： CO2 Elevation Isoflavone Tocopherol Fatty acid Mineral element

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Diversity and distribution patterns of non-volant smallmammals along different Elevation gradients on Mt. Kenya,Kenya

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Zoological Research 2019年第1期40卷 53-60页

作者： Simon Musila Zhong-Zheng Chen Quan Li Richard Yego Bin Zhang Kenneth Onditi Immaculate Muthoni Shui-Wang He Samson Omondi James Mathenge Esther N.Kioko Xue-Long Jiang Mammalogy Section Department of Zoology National Museums of Kenya Kunming Institute of Zoology Chinese Academy of Sciences Anhui Province Key Laboratory for Conservation and Exploitation of Biological Resource College of Life Science Anhui Normal University Sino-Africa Joint Research Center Chinese Academy of Sciences Kenya Wildlife Service Mweiga Research Station

The distribution of small mammals in mountainous environments across different Elevations can provide important information on the effects of climate change on the dispersal of species. However, few studies conducted on Afromontane ecosystems have compared the altitudinal patterns of small mammal diversity. We investigated the species diversity and abundance of non-volant small mammals(hereafter ‘small mammals')on Mt. Kenya, the second tallest mountain in Africa,using a standard sampling scheme. Nine sampling transects were established at intervals of 200 m on the eastern(Chogoria) and western(Sirimon) slopes.A total of 1 905 individuals representing 25 species of small mammals were trapped after 12 240 trap-nights.Abundance was highest at mid-Elevations on both slopes.However, species richness and their distribution patterns differed between the two slopes. More species were recorded on Chogoria(24) than on Sirimon(17). On Chogoria, species richness was higher at mid-high Elevations, with a peak at mid-Elevation(2 800 m a.s.l.),whereas species richness showed little variation on the Sirimon slope. These results indicate that patterns of species diversity can differ between slopes on the same mountain. In addition, we extensively reviewed literature on Mt. Kenya's mammals and compiled a comprehensive checklist of 76 mammalian species. However, additional research is required to improve our understanding of smal mammal diversity in mountain habitats in Africa.

关键词： Small mammals Species richness Abundance Elevation Mt.Kenya

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Relationship between serum homocysteine levels and long-term outcomes in patients with ST-segment Elevation myocardial infarction

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Chinese Medical Journal 2019年第9期132卷 1028-1036页

作者： Jin Si Xue-Wen Li Yang Wang Ying-Hua Zhang Qing-Qing Wu Lei-Min Zhang Xue-Bing Zuo Jing Gao Jing Li Department of Cardiology Xuanwu HospitalCapital Medical UniversityBeijing 100053China Department of Cardiology Tianjin Medical UniversityTianjin 300070China Cadre's Ward Characteristic Medical Center of Chinese People's Armed Police ForceTianjin 300162China Medical Research & Biometrics Center National Center for Cardiovascular DiseasesFuwai HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100037China Department of Cardiology Beijing Luhe HospitalCapital Medical UniversityBeijing 101149China Department of Cardiology Qinghe Substation Hospital of Beijing Municipal Administration of PrisonsTianjin 300481China

Background:The mortality of cardiovascular disease is constantly rising,and novel biomarkers help us predict residual risk.This study aimed to evaluate the predictive value of serum homocysteine (HCY) levels on prognosis in patients with ST-segment Elevation myocardial infarction (STEMI).Methods:The 419 consecutive patients with STEMI,treated at one medical center,from March 2010 to December 2015 were retrospectively investigated.Peripheral blood samples were obtained within 24 h of admission and HCY concentrations were measured using an enzymatic cycling assay.The patients were divided into high HCY level (H-HCY) and low HCY level (L-HCY) groups.Short- and long-term outcomes were compared,as were age-based subgroups (patients aged 60 years and younger vs.those older than 60 years).Statistical analyses were mainly conducted by Student t-test,Chi-squared test,logistic regression,and Cox proportional-hazards regression.Results:The H-HCY group had more males (84.6% vs.75.4%,P=0.018),and a lower prevalence of diabetes (20.2% vs.35.5%,P<0.001),compared with the L-HCY group.During hospitalization,there were seven mortalities in the L-HCY group and 10 in the H-HCY group (3.3% vs.4.8%,P= 0.440).During the median follow-up period of 35.8 (26.9–46.1) months,33 (16.2%) patients in the L-HCY group and 48 (24.2%) in the H-HCY group experienced major adverse cardiovascular and cerebrovascular events (MACCE)(P=0.120).History of hypertension (hazard ratio [HR]:1.881,95% confidence interval [CI]:1.178–3.005,P=0.008) and higher Killip class (HR:1.923,95% CI:1.419–2.607,P<0.001),but not HCY levels (HR:1.007,95% CI:0.987–1.027,P=0.507),were significantly associated with long-term outcomes.However,the subgroup analysis indicated that in older patients,HCY levels were significantly associated with long-term outcomes (HR:1.036,95% CI:1.011–1.062,P=0.005).Conclusion:Serum HCY levels did not independently predict in-hospital or long-term outcomes in patients with STEMI;however,among elderly patients with STEMI,this study revealed a risk

关键词： Homocysteine Acute ST-segment Elevation myocardial infarction Percutaneous coronary intervention Clinical outcome

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Invasive versus conservative strategy in consecutive patients aged 80 years or older with non-ST-segment Elevation myocardial infarction: a retrospective study in China

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Journal of Geriatric Cardiology 2019年第10期16卷 741-748页

作者： Yong-Gang SUI Si-Yong TENG Jie QIAN Yuan WU Ke-Fei DOU Yi-Da TANG Shu-Bin QIAO Yong-Jian WU Department of Cardiology Fuwai Hospital National Center for Cardiovascular Diseases Chinese Academy of Medical Sciences and Peking Union Medical College

Objective To investigate whether the very elderly patients with non-ST-segment Elevation myocardial infarction (NSTEMI) will benefit from an invasive strategy versus a conservative strategy. Methods 190 consecutive patients aged 80 years or older with NSTEMI were included in the retrospective study from September 2014 to August 2017, of which 69 patients received conservative strategy and 121 patients received invasive strategy. The primary outcome was death. Multivariate Cox regression models were used to assess the statistical association between strategies and mortality. The survival probability was further analyzed. Results The primary outcome occurred in 17.4% patients in the invasive group and in 42.0% patients in the conservative group (P = 0.0002). The readmission rate in the invasive group (14.9%) was higher than that in the conservative group (7.2%). Creatinine level (OR = 1.01, 95% CI: 0.10–1.03, P = 0.05) and use of diuretic (OR = 3.65, 95% CI: 1.56–8.53, P = 0.003) were independent influential factors for invasive strategy. HRs for multivariate Cox regression models were 3.45 (95% CI: 1.77–6.75, P = 0.0003), 3.02 (95% CI: 1.52–6.01, P = 0.0017), 2.93 (95% CI: 1. 46–5.86, P = 0.0024) and 2.47 (95% CI: 1.20–5.07, P = 0.0137). Compared with the patients received invasive strategy, the conservative group had remarkably reduced survival probability with time since treatment (P < 0.001). Conclusions An invasive strategy is superior to a conservative strategy in reducing mortality of patients aged 80 years or older with NSTEMI. Our results suggest that an invasive strategy is more suitable for the very elderly patients with NSTEMI in China.

关键词： Conservative strategy Death Invasive strategy Non-ST-segment Elevation myocardial infarction

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The relation between serum phosphorus levels and long-term mortality in Chinese patients with ST-segment Elevation myocardial infarction

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Journal of Geriatric Cardiology 2019年第10期16卷 775-781页

作者： Guo-Hua ZHU Xi-Peng SUN Zhi LIU Zhen-Xing FAN Yan-Ling WANG Jing TAN Jing LI Qi HUA Department of Cardiology Xuanwu Hospital Capital Medical University

Background Elevated serum phosphorus levels may be associated with adverse outcomes in cardiovascular disease. This study aimed to investigate the relation between serum phosphorus levels and risk of all-cause mortality in Chinese patients with ST-segment Elevation myocardial infarction (STEMI) who had preserved renal function at baseline. Methods We enrolled patients with STEMI who had preserved renal function at baseline in Xuanwu Hospital from January 2011 to December 2016. Those patients were divided into four groups based on serum phosphorus levels. All-cause mortality rates were compared between groups. Mean duration of follow up was 54.6 months. We used Cox proportional-hazards models to examine the relation between serum phosphorus levels and all-cause mortality after adjustment for potential confounders. Results 1989 patients were involved and 211 patients (10.6%) died during follow-up. Based on serum phosphorus levels, patients were categorized into the following groups: 4.50 mg/dL (n = 162), respectively. The lowest mortality occurred in patients with serum phosphorus levels between 2.51–3.50 mg/dL, with a multivariable-adjusted hazard ratio of 1.19 (95% CI: 0.64–1.54), 1.37 (95% CI: 1.22–1.74), and 1.46 (95% CI: 1.35–1.83) in patients with serum phosphorus levels of 4.50 mg/dL, respectively. Conclusions Elevated serum phosphorus levels were associated with all-cause mortality in Chinese patients with STEMI who had preserved renal function at baseline.

关键词： Mortality Serum phosphorus levels ST-segment Elevation myocardial infarction

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Differences in symptoms and pre-hospital delay among acute myocardial infarction patients according to ST-segment Elevation on electrocardiogram: an analysis of China Acute Myocardial Infarction (CAMI) registry

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Chinese Medical Journal 2019年第5期132卷 519-524页

作者： Rui Fu Chen-Xi Song Ke-Fei Dou Jin-Gang Yang Hai-Yan Xu Xiao-Jin Gao Qian-Qian Liu Han Xu Yue-Jin Yang Department of Cardiology Fuwai Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100037 China

Background: Approximately 70% patients with acute myocardial infarction (AMI) presented without ST-segment Elevation on electrocardiogram. Patients with non-ST segment Elevation myocardial infarction (NSTEMI) often presented with atypical symptoms, which may be related to pre-hospital delay and increased risk of mortality. However, up to date few studies reported detailed symptomatology of NSTEMI, particularly among Asian patients. The objective of this study was to describe and compare symptoms and presenting characteristics of NSTEMI vs. STEMI patients. Methods: We enrolled 21,994 patients diagnosed with AMI from China Acute Myocardial Infarction (CAMI) Registry between January 2013 and September 2014. Patients were divided into 2 groups according to ST-segment Elevation: ST-segment Elevation (STEMI) group and NSTEMI group. We extracted data on patients' characteristics and detailed symptomatology and compared these variables between two groups. Results: Compared with patients with STEMI (N=16,315), those with NSTEMI (N=5679) were older, more often females and more often have comorbidities. Patients with NSTEMI were less likely to present with persistent chest pain (54.3% vs.71.4%), diaphoresis (48.6% vs.70.0%), radiation pain (26.4% vs.33.8%), and more likely to have chest distress (42.4% vs.38.3%) than STEMI patients (all P<0.0001). Patients with NSTEMI were also had longer time to hospital. In multivariable analysis, NSTEMI was independent predictor of presentation without chest pain (odds ratio: 1.974, 95% confidence interval:1.849-2.107). Conclusions: Patients with NSTEMI were more likely to present with chest distress and pre-hospital patient delay compared with patients with STEMI. It is necessary for both clinicians and patients to learn more about atypical symptoms of NSTEMI in order to rapidly recognize myocardial infarction.

关键词： Non-ST segment Elevation myocardial infarction Symptom assessment Time to treatment

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Elevation as a selective force on mitochondrial respiratory chain complexes of the Phrynocephalus lizards in the Tibetan plateau

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Current Zoology 2021年第2期67卷 191-199页

作者： Yuanting JIN Débora Y.C.BRANDT Jiasheng LI Yubin WO Haojie TONG Vladimir SHCHUR College of Life Science China Jiliang UniversityHangzhou310018China Department of Integrative Biology University of California at BerkeleyBerkeleyCA94720-3140USA International Laboratory of Statistical and Computational Genomics National Research University Higher School of EconomicsMoscowRussia

Animals living in extremely high Elevations have to adapt to low temperatures and low oxygen availability(hypoxia),but the underlying genetic mechanisms associated with these adaptations are still unclear.The mitochondrial respiratory chain can provide>95%of the ATP in animal cells,and its efficiency is influenced by temperature and oxygen availability.Therefore,the respiratory chain complexes(RCCs)could be important molecular targets for positive selection associated with respiratory adaptation in high-altitude environments.Here,we investigated positive selection in 5 RCCs and their assembly factors by analyzing sequences of 106 genes obtained through RNA-seq of all 15 Chinese Phrynocephalus lizard species,which are distributed from lowlands to the Tibetan plateau(average Elevation>4,500 m).Our results indicate that evidence of positive selec-tion on RCC genes is not significantly different from assembly factors,and we found no difference in selective pressures among the 5 complexes.We specifically looked for positive selection in line-ages where changes in habitat Elevation happened.The group of lineages evolving from low to high altitude show stronger signals of positive selection than lineages evolving from high to low Elevations.Lineages evolving from low to high Elevation also have more shared codons under positive selection,though the changes are not equivalent at the amino acid level.This study advan-ces our understanding of the genetic basis of animal respiratory metabolism evolution in extreme high environments and provides candidate genes for further confirmation with functional analyses.

关键词： Elevation positive selection reptile plateau respiratory chain complexes

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