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Assessing the response of dryland barley yield to climate variability in semi-arid regions,Iran

Journal of Arid Land 2021年第9期13卷 905-917页

作者： Mohammad KHEIRI Jafar KAMBOUZIA Reza DEIHIMFARD Saghi M MOGHADDAM Seyran ANVARI Department of Agroecology Environmental Sciences Research InstituteShahid Beheshti UniversityTehran ***Iran Faculty of Environmental Sciences Czech University of Life Sciences PraguePrague 16500Czech Republic

Precipitation and temperature are the most abiotic factors that greatly impact the yield of crop,particularly in ***,as the main cereal is predominantly cultivated in dryland and the livelihood of smallholders depends on the production of this crop,particularly in arid and semi-arid *** study aimed to investigate the response of the grain yield of dryland barley to temperature and precipitation variations at annual,seasonal and monthly scales in seven counties of East and West Azerbaijan provinces in northwestern Iran during *** index(HI)was calculated and its relationship with dryland barley yield was evaluated at annual and monthly *** results showed that the minimum,maximum and mean temperatures increased by 0.19℃/a,0.11℃/a and 0.10℃/a,respectively,while annual precipitation decreased by 0.80 mm/a during *** in study area has become drier by 0.22/a in annual HI during the study *** effects of increasing temperature on the grain yield of dryland barley were more severe than the positive effects of increasing ***,weather variations in April and May were related more to the grain yield of dryland barley than those in other *** grain yield of dryland barley was more drastically affected by the variation of annual minimum temperature comparing with other weather ***,our findings illustrated that the grain yield of dryland barley increased by 0.01 t/hm^(2) for each unit increase in annual HI during ***,any increase in the monthly HI led to crop yield improvement in the study area,particularly in the drier counties,i.e.,Myaneh,Tabriz and Khoy in Iran.

关键词： humidity index crop yield spatiotemporal variation temperature precipitation

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Dynamics of the vegetation eco-boundary under climate warming in Northeast China

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Journal of Forestry Research 2000年第3期11卷 191-197页

作者：邹春静韩士杰周玉梅张军辉王琛瑞 Institute of Applied Ecology Chinese Academy of Sciences Shenyang P.R. China

Based on data from 210 meteorological stations in Northeast China and survey on zonal climax vegetation, the Kira's warmth index (W l), coldness index (C l), and Xu Wenduo's humidity index (H l) were adopted to simulate and predict the dynamics of the vegetation eco-boundary under climate warming in Northeast China. The future vegetation eco-boundary alteration types of zonal climax vegetation could be divided into three types, such as extended vegetation eco-boundary species (W l value range for 45–95°C · month) which would move northwards under climate warming, retreated vegetation eco-boundary species (W l value range for 25–65°C · month) which would retreat from the present localities, and extinct population species (W l value range for 5–35°C · month) which would be extinguished because the ecosystems they depend on disappeared. In Northeast China, there were differences for 15° latitudinal and 2600 m altitudinal. Based on our research results, the edificators would move northwards about 400–700 km, steppe vegetation would move eastwords 900 km, and the populations would move upwards about 260–360 m in mountains if the global temperature increases 2°C in the future. However, the moving distance would become shorter and shorter as the latitude and altitude increased. Therefore, the populations in alpine tundra zone at Daxing'an Mountains and Changbai Mountain might disappear. The results were expected to supply reference to local government when they set down strategies to respond to climate change in the future.

关键词： Warmth index humidity index Vegetation Eco-boundary

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