壤类型及土壤物理!化学性质因其来源不同而并且土壤多为生土"有机物含量低"速效养分贫乏"结构性质差"不利于幼苗的生长#此外"由于路基高于地面"边坡土壤接受太阳辐射不同$阳坡接受阳光辐射较多"温度上升快"土壤温度常常
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