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effect of farmland expansion on drought over the past century in Songnen Plain,Northeast China

Journal of Geographical Sciences 2020年第3期30卷 439-454页

作者： YU Wanhui ZHANG Lijuan ZHANG Hongwen JIANG Lanqi ZHANG Ankang Pan Tao Key Laboratory of Remote Sensing Monitoring of Geographic Environment College of Heilongjiang ProvinceHarbin Normal UniversityHarbin 150025China Key Laboratory of Land Surface Process and Climate Change in Northwest Institute of Eco-Environment and Resources CASLanzhou 730000China Heilongjiang Province Institute of Meteorological Sciences Innovation and Opening Laboratory of Regional Eco-Meteorology in NortheastChina Meteorological AdministrationHarbin 150030China

The effects of human activities on climate change are a significant area of research in the field of global environmental *** use and land cover change(LUCC)has a greater effect on climate than greenhouse gases,and the effect of farmland expansion on regional drought is particularly *** the 1910s to the 2010s,cultivated land in Songnen Plain increased by 2.67 times,the area of cultivated land increased from 4.92×10^4 km^2 to 13.14×10^4 km^2,and its percentage of all land increased from 25%to 70%.This provides an opportunity to study the effects of the conversion of natural grassland to farmland on *** this study,the drought indices in Songnen Plain were evaluated from the 1910s to the 2010s,and the effect of farmland expansion on drought was investigated using statistical methods and the Weather Research and Forecasting Model based on UK’s Climatic Research Unit *** resulting dryness index,Palmer drought severity index,and standardized precipitation index values indicated a significant drying trend in the study area from 1981 to *** trend can be attributed to increases in maximum temperature and diurnal temperature range,which increased the degree of *** on statistical analysis and simulation,the maximum temperature,diurnal temperature range,and sensible heat flux increased during the growing season in Songnen Plain over the past 100 years,while the minimum temperature and latent heat flux *** findings indicate that farmland expansion caused a drying trend in Songnen Plain during the study period.

关键词： drought effect farmland expansion centennial-scale changes Songnen Plain

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Decline and dieback of cork oak(Quercus suber L.)forests in the Mediterranean basin:a case study of Kroumirie,Northwest Tunisia

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Journal of Forestry Research 2020年第5期31卷 1461-1477页

作者： Issam Touhami E.Chirino H.Aouinti A.El Khorchani M.T.Elaieb A.Khaldi Z.Nasr The National Research Institute of Rural Engineering Waterand ForestryINRGREFLaboratory of Management and Valorization of Forest ResourcesUniversity of CarthageBP 102080 ArianaTunisia Faculty of Agricultural Sciences Lay University Eloy Alfaro de Manabı´Ciudadela Universitariaav.Circunvalacio´n vı´a San Mateo s/nMantaManabı´Ecuador

Assessing the vulnerability of forest ecosystems in the climate change context is a challenging task as the mechanisms that determine this vulnerability cannot be directly *** on the ecological interrelationships between forests and climate,the present review focused on providing current information about vulnerability assessments of cork oak(Quercus suber L.)forests in the Mediterranean basin,especially,in the Kroumirie region(northwest Tunisia),currently under historic extreme drought *** comparing recent findings in this region,we synthesized data on cork oak decline and mortality collected during the historic drought years 1988–1995 *** change impacts cork forest decline,with special interest shown in elevated temperatures and drought;cork oak forest regeneration,and the adaptation of the Kroumirie forest to climate change,are reviewed *** studied region has been influenced largely by frequent prolonged drought periods,especially from 1988 to *** were found to consistently have a more detrimental impact on the growth and mortality rates of cork oak *** oak mortality was recorded for up to 63,622 *** the future,more research studies and observational data will be needed,which could represent an important key to understand ecosystem processes,and to facilitate the development of better models that project climate change impacts and *** study is useful for researchers and forestry decision makers to develop the appropriate strategies to restore and protect ecosystems,and to help anticipate potential future droughts and climate change.

关键词： Climate change drought effect Forest decline Tree mortality Mediterranean forest

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