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半干旱区
[地理] semi-arid region
- 东北半干旱区是我国北方旱农地区的重要组成部分，多数地区没有灌溉水源。
Northeast semi-arid region is one of the main parts of the north dry farming area, most of which no irrigation water resources. - 土壤盐渍化是干旱半干旱区土地退化的主要形式之一，其发生发展是一个复杂的非线性动力学过程。
Soil-salinization is one of the main forms of land degradation in arid and semi-arid region, and its(happening) and development are complex non-linear dynamic process. - 文章所建的树轮定年年表是国内目前最长的连续年表，它可为我国西北干旱-半干旱区树轮长序列的定年提供标尺。
This is by far the longest tree ring dating chronology in China, which can be used as a reference for ring-width dating for trees from the arid and semi-arid regions of Northwest China.
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