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    Optimum planting depth to poplar mechanical afforestation in subarid sand
    半干旱沙地杨树机械造林的最佳栽植深度
    A study on occurrence process, affecting factors and control technology measures of wind erosion on arid and subarid agricultural lands
    旱作农区土壤风蚀过程、影响因素及其防治技术措施
    Study on Investigations and Heredity Characters of Germplasm Resource of Siberian Apricot in Subarid Area
    半干旱地区山杏种质资源调查及遗传特性的研究
    (1)Arid-subarid palaeoclimate was helpful for mechanical weathering of source rocks and torrent forming;
    认为本区沙三段时期满足重力流的形成条件,主要表现在六个方面:(1)干旱-半干旱的气候环境有利于母岩的机械风化和山洪的形成;
    These materials reveal that Holocene paleosol around Xi′an formed during Megathermal is luvic cinnamon soil developing in warm and humid climate but not developing in subarid climate.
    结果表明 ,该地区全新世大暖期的古土壤为温湿气候条件下发育的淋溶褐土 ,并非过去所称的半干旱条件下发育的“黑垆土” .
    The west of Jilin province is a subarid ecotone with farming and stockbreeding, which main characteristics (soil desertization and alkalization, steppe degeneration) have restricted the sustainable development in social economy of Jilin province.
    吉林省西部为半干旱农牧交错区,以土地沙化、盐碱化和草原退化为主要特征的荒漠化制约着社会经济的可持续发展。
 

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