Đang chuẩn bị liên kết để tải về tài liệu:
Climate Change and Variability Part 13

Tham khảo tài liệu 'climate change and variability part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 348 Climate Change and Variability 5. Land Evaluation in Climate Change Scenarios Bioclimatic deficiency land capability land vulnerability and finally in summary land evaluation or land use planning will vary following the climate change impacts on the indexes. Thus management will have an important role to achieve the sustainability. 5.1. Land Productivity Impact 5.1.1. Bioclimatic Deficiency in East Azerbaijan While temperature conditions may be favorable for growing new types of crops moisture deficits may preclude these new crops as an adaptation option. However in order to adopt these new crops moisture deficits could be overcome through the use of irrigation also an adaptive strategy . Decreasing availability of water for all users will lead to conflicts as producers compete with re-creationists household users electrical utilities and the manufacturing and other industry for water for irrigation Rosenberg 1992 Wittrock Wheaton 1992 . Moisture stress as affected by rainfed and irrigated conditions and impacts on yield reduction of production for wheat alfalfa sugar beet potato and maize as major crops in Ahar area was calculated applying the Terraza model Figure 6 . Fig. 6. Annual yield reduction for cultivation of irrigated and rainfed comparing two scenarios Shahbazi et al. 2009 a Water irrigation supplement based on usual amount in the study area see Table 6 Bioclimatic classification H1 0-20 H2 20-40 H3 40-60 H4 60 In the current situation the Terraza modelling approach predicts that wheat has 0 H1 class of yield reduction in both rainfed and irrigated cultivations. The usual irrigation in the study area for potato and alfalfa is sufficient increasing their bioclimatic classes from H3 and H2 to H1. Sugar beet and maize currently have 57 and 72 yield reduction of production while this reduction will decrease to 23 and 20 respectively for the selected crops. Results reveal that usual irrigation the amount of water is sufficient for wheat alfalfa and sugar