The management and planning of citrus orchards at a regional scale with GIS |
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Authors: | Wei Wu Hong-Bin Liu Heng-Lin Dai Wei Li Peng-Shou Sun |
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Institution: | (1) College of Computer and Information Science, Southwest University, 400716 Chongqing, China;(2) College of Resources and Environment, Southwest University, 400716 Chongqing, China;(3) Chongqing Agriculture Bureau, 400015 Chongqing, China;(4) Chongqing Key Laboratory of Digital Agriculture, Southwest University, 400716 Chongqing, China; |
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Abstract: | Citrus growing is regarded as an important cash crop in some regions of China. A geographic information system (GIS) was used
to investigate the growing conditions of citrus orchards in Chongqing, China. Digital maps on topography, land use, soil types
and climate were obtained and a digital elevation model (DEM) was produced at a scale of 1:10 000 using a GIS. A total of
50 representative orchards (2032 ha) were examined and extensive investigation were carried out in the summer of 2007. Topographic
characteristics of the orchards studied were determined using the DEM. About 53% of the total area covered by the orchards
has slopes of 8–25° and 4.4% has slopes steeper than 35°. The orchards were dominantly on south-facing slopes (42%). About
80% of the orchards were within 200–400 m in altitude. The orchards were mainly on soil developed on purple shale and limestone
(86 and 14% of the total area, respectively). About 42% of the area has soil with a pH of less than 5.5. The majority of the
study area (60%) has soil with organic matter contents of 1–2%. General guidelines for sustainable citrus production are proposed
based on the topography and soil properties of the citrus orchards. The result of regional planning indicates that about one-third
of the total area of Chongqing is suitable for citrus growth (2.68 × 106 ha). A GIS-based database management system provides a new perspective on the management and planning of citrus orchards
in Chongqing. |
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