The researchers measured the retreat of the permafrost border byobserving hummocks known as "palsas, " which form naturally over icecontained in the soil of northern peat bogs.
研究人员通过观测被称为泥炭丘的小丘来测量永冻带边界北退的程度，泥炭丘是在北部泥炭沼泽含冰的土壤上自然形成的。
Loosen the soil in the entire planting area with a claw, border fork or hand trowel until it is smooth and light-almost fluffy.
松土，用耙或土叉把准备耕种的地全部耙松，尽量平整松散。
The characteristics of soil water distribution and soil water balance of winter wheat were analyzed under sprinkler irrigation, with surface irrigation (border irrigation) as the control treatment.
以传统地面灌溉(畦灌)为对照，分析了喷灌条件下，冬小麦农田土壤水分分布特征和水量平衡。
Combining with the current situation of the field investigation, and basing on the second grade border, we assign the polluted area to be the early warning district of soil heavy metal pollution.
结合野外实地调查现状，以二级边界为基础，将污染区域划为土壤重金属污染预警区。
Combining with the current situation of the field investigation, and basing on the second grade border, we assign the polluted area to be the early warning district of soil heavy metal pollution.
结合野外实地调查现状，以二级边界为基础，将污染区域划为土壤重金属污染预警区。
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