scholarly journals Characterizing multiscale effects of climatic factors on the temporal variation of vegetation in different climatic regions of China

2022 ◽  
Author(s):  
Hongfen Zhu ◽  
Ruipeng Sun ◽  
Rutian Bi ◽  
Meiting Hou
Keyword(s):  
Temporal Variation ◽  
Climatic Factors ◽  
Climatic Regions

scholarly journals The role of socioeconomic and climatic factors in the spatio-temporal variation of human rabies in China

2018 ◽  
Vol 18 (1) ◽  
Author(s):  
Danhuai Guo ◽  
Wenwu Yin ◽  
Hongjie Yu ◽  
Jean-Claude Thill ◽  
Weishi Yang ◽  
...  
Keyword(s):  
Temporal Variation ◽  
Climatic Factors ◽  
Human Rabies ◽  
Spatio Temporal

scholarly journals Potential Contribution of Climate Conditions on COVID-19 Pandemic Transmission over West and North African Countries

Atmosphere ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 34
Author(s):  
Ibrahima Diouf ◽  
Souleymane Sy ◽  
Habib Senghor ◽  
Papa Fall ◽  
Diarra Diouf ◽  
...  
Keyword(s):  
Water Vapor ◽  
Climatic Factors ◽  
Explanatory Power ◽  
Specific Humidity ◽  
World Health ◽  
Potential Contribution ◽  
Gulf Of Guinea ◽  
African Countries ◽  
Climate Conditions ◽  
Climatic Regions

COVID-19, caused by the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2), is a very contagious disease that has killed many people worldwide. According to data from the World Health Organization (WHO), the spread of the disease appears to be slower in Africa. Although several studies have been published on the relationship between meteorological parameters and COVID-19 transmission, the effects of climate conditions on COVID-19 remain largely unexplored and without consensus. However, the transmission of COVID-19 and sensitivity to climate conditions are also not fully understood in Africa. Here, using available epidemiological data over 275 days (i.e., from 1 March to 30 November 2020) taken from the European Center for Disease Prevention and Control of the European Union database and daily data of surface air temperature specific humidity and water vapor from the National Center for Environmental Prediction (NCEP), this paper investigates the potential contribution of climate conditions on COVID-19 transmission over 16 selected countries throughout three climatic regions of Africa (i.e., Sahel, Maghreb, and Gulf of Guinea). The results highlight statistically significant inverse correlations between COVID-19 cases and temperature over the Maghreb and the Gulf of Guinea regions. In contrast, positive correlations are found over the Sahel area, especially in the central part, including Niger and Mali. Correlations with specific humidity and water vapor parameters display significant and positive values over the Sahelian and the Gulf of Guinea countries and negative values over the Maghreb countries. Then, the COVID-19 pandemic transmission is influenced differently across the three climatic regions: (i) cold and dry environmental conditions over the Maghreb; (ii) warm and humid conditions over the Sahel; and (iii) cold and humid conditions over the Gulf of Guinea. In addition, for all three climatic regions, even though the climate impact has been found to be significant, its effect appears to display a secondary role based on the explanatory power variance compared to non-climatic factors assumed to be dominated by socio-economic factors and early strong public health measures.

scholarly journals Genetic Diversity and Population Structure of the Asian Tiger Mosquito (Aedes albopictus) in Vietnam: Evidence for Genetic Differentiation by Climate Region

Genes ◽  
2021 ◽  
Vol 12 (10) ◽  
pp. 1579
Author(s):  
Cuong Van Duong ◽  
Ji Hyoun Kang ◽  
Vinh Van Nguyen ◽  
Yeon Jae Bae
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Aedes Albopictus ◽  
Disease Transmission ◽  
Climatic Factors ◽  
Control Strategies ◽  
Geographic Distance ◽  
Coi Gene ◽  
Tropical Regions ◽  
Climatic Regions

Aedes albopictus is a native mosquito to Southeast Asia with a high potential for disease transmission. Understanding how Ae. albopictus populations that develop in the species’ native range is useful for planning future control strategies and for identifying the sources of invasive ranges. The present study aims to investigate the genetic diversity and population structure of Ae. albopictus across various climatic regions of Vietnam. We analyzed mitochondrial cytochrome oxidase I (COI) gene sequences from specimens collected from 16 localities, and we used distance-based redundancy analysis to evaluate the amount of variation in the genetic distance that could be explained by both geographic distance and climatic factors. High levels of genetic polymorphism were detected, and the haplotypes were similar to those sequences from both temperate and tropical regions worldwide. Of note, these haplotype groups were geographically distributed, resulting in a distinct population structure in which northeastern populations and the remaining populations were genetically differentiated. Notably, genetic variation among the Ae. albopictus populations was driven primarily by climatic factors (64.55%) and to a lesser extent was also influenced by geographic distance (33.73%). These findings fill important gaps in the current understanding of the population genetics of Ae. albopictus in Vietnam, especially with respect to providing data to track the origin of the invaded regions worldwide.

scholarly journals Characterizing Multiscale Effects of Climatic Factors on the Temporal Variation of Vegetation in Different Climatic Regions of China

2021 ◽  
Author(s):  
hongfen zhu ◽  
Haoxi Ding ◽  
Rutian Bi ◽  
Meiting Hou
Keyword(s):  
Climatic Factors ◽  
Influencing Factor ◽  
Explanatory Power ◽  
Northwest China ◽  
Wavelet Coherence ◽  
Medium Term ◽  
Vegetation Dynamic ◽  
Climatic Regions ◽  
Wavelet Coherency ◽  
Warm Temperate

Abstract Vegetation dynamic is sensitive to climatic warming, and is affected by individual or combined climatic factors at different temporal scale with different intensity. Previous studies have unraveled the relationships between vegetation condition and individual climatic factors; however, it is unclear whether the effects of single or combined climatic factors on vegetation dynamic was dominant for different temporal scales, vegetation types, and climatic regions. The objective of this study was to explore the scale-specific univariate and multivariate controls on vegetation over the period 1982–2015 using bivariate wavelet coherency (BWC), multiple wavelet coherence (MWC), and multiple empirical model decomposition (MEMD). The results indicated that the significant vegetation dynamics were mainly located at scales of 1, 0.5, and 0.3 years. The combined explanatory power of the seven climatic factors on the vegetation were greater at the short-term and long-term scales, while the individual climatic factor might affect vegetation dynamic in the seasonal and medium-term scales at some climatic regions. The combined effect of climatic factors in grassland of Tibetan Plateau (TP) and Tempera grassland of Inner Mongolia (TGIM) regions were the greatest, which were 65.06% and 59.53%, respectively. The explanatory powers of climate for crop dynamics between temperate humid & subhumid Northeast China (THSNC) and TP, warm-temperate humid & subhumid North China (WHSNC) and subtropical humid Central & South China (SHCSC), and TGIM and temperate & warm-temperate desert of Northwest China (TWDNC) were equivalent, which were around 47%, 45%, and 39%, respectively. Farming practices in cropland could alleviate the spatial variation of the relationships between climate and vegetation, while enhance the temporal difference of their relationships. Additionally, the dominant influencing factor among different regions varied greatly in the medium-term scale. Collectively, the results might provide alternative perspective for understanding vegetation evolution in response to climatic changes in China.

Temporal variation of litter decomposition in relation to simulated soil climate. Long-term decomposition in a Scots pine forest. V

1985 ◽  
Vol 63 (6) ◽  
pp. 1008-1016 ◽  
Author(s):  
P.-E. Jansson ◽  
B. Berg
Keyword(s):  
Temporal Variation ◽  
Soil Water ◽  
Scots Pine ◽  
Climatic Factors ◽  
Time Lag ◽  
Pine Forest ◽  
Soil Water Tension ◽  
Needle Litter ◽  
Scots Pine Forest ◽  
Soil Climate

Decomposition of Scots pine needle litter was studied in a Scots pine forest in central Sweden. A 6-year series with annual incubations of needle litter was used to analyse the climatic influence on the process. The original litter was of similar chemical properties between years and each year new litter was incubated, in the same way, in the autumn. Sampling took place at time intervals ranging from 1 month to 1 year. Soil climate variables such as temperature and water contents and tensions were calculated with a soil water and heat model from standard meteorological data. Decomposition rates from periods longer than 145 days were correlated with different soil climatic factors. The responses for the 1st and 2nd incubation years were not significantly different, but higher coefficients of determination (r2) were found for the 2nd year. Estimated actual evapotranspiration or soil temperature explained temporal variation of decomposition to about 70%; soil water content only or soil water tension only explained 90%. When moisture and temperature were combined, 95 and 99% of the variation could be explained for the 1st and 2nd year, respectively. When time periods down to 1 month were included, very poor fits were found with the same climate response functions. However, the relationships were improved by an inertia function which indicated a time lag of 2–3 months between soil climate and the response in decomposition rate.

scholarly journals Seed dormancy varies widely among Arabidopsis thaliana populations both between and within Fennoscandia and Italy

2021 ◽  
Author(s):  
Giulia Zacchello ◽  
Svenja Bomers ◽  
Cecilia Böhme ◽  
Froukje Postma ◽  
Jon Agren
Keyword(s):  
Climate Change ◽  
Arabidopsis Thaliana ◽  
Seed Dormancy ◽  
Climatic Factors ◽  
Summer Temperature ◽  
Population Variation ◽  
Life History Trait ◽  
Adaptive Potential ◽  
Climatic Regions ◽  
The Relationship

The timing of germination is a key life-history trait in plants, which is strongly affected by the strength of seed dormancy. Continental-wide variation in seed dormancy has been related to differences in climate and the timing of conditions suitable for seedling establishment. However, for predictions of adaptive potential and consequences of climatic change, information is needed regarding the extent to which seed dormancy varies within climatic regions and the factors driving such variation We planted 17 Italian and 28 Fennoscandian populations of Arabidopsis thaliana in the greenhouse and at two field sites in Italy and Sweden. To identify possible drivers of among-population variation in seed dormancy, we examined the relationship between seed dormancy and climate at the sites where populations were originally sampled. Seed dormancy was on average stronger in the Italian compared to the Fennoscandian populations, but also varied widely within both regions. Estimates of seed dormancy in the three maternal environments were positively correlated, but seeds had on average stronger dormancy when produced in the greenhouse than at the two field sites. Among Fennoscandian populations, seed dormancy tended to increase with increasing summer temperature and decreasing precipitation at the site of origin. In the smaller sample of Italian populations, no significant association was detected between mean seed dormancy and climate at the site of origin. The correlation between seed dormancy and climatic factors in Fennoscandia suggests that at least some of the among-population variation is adaptive and that climate change will affect selection on this trait.

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