大多数冰岛人靠农业谋生？ ？人们的希望寄托在土地，即土壤上。
Most icelanders derived their livelihood from farming? And people 's hopes were centered on the land, its soil.
受自然和人为因素的影响，土壤特性在空间分布上呈现非均一性，即土壤特性的空间变异性。
Affected by the nature and human factors, soil property is non - homogeneous in the spatial distribution, that is spatial variability of soil property.
甲磺隆在土壤中的降解符合指数降解规律，即土壤中剩余甲磺隆浓度的对数与小麦生长时间呈线性负相关；
The degradation rule of metsulfuron-methyl accorded with decaying exponential, that meant there was inverse linear correlation between the logarithm of metsulfuron-methyl concentration and the time;
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