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冰川冻土  2012 

藏北高原D105点土壤冻融状况与温湿特征分析

, PP. 56-63

Keywords: 藏北高原,D105,土壤温度,未冻含水量,土壤冻融

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Abstract:

利用CAMP/Tibet在藏北高原D105点所观测的2002年1月1日—2005年12月31日土壤温度、含水量资料,分析了该点的土壤温、湿度变化及其冻融特征.结果表明D105点40cm深度以上土壤温度日变化明显,随着深度增加,土壤温度日变化相位明显滞后.各层土壤温度月最高值出现在8-9月,月最低值都出现在1-2月;年际气候的差异至少可以反映到185cm深处的土壤.土壤冻结和消融都是由表层开始,土壤随深度增加冻结快,消融则慢.冻结期间,土壤温度分布上部低,下部高;消融期间,则分布相反.60cm深度以上的土壤含水量在消融期有显著的波动,表明60cm深度以上的土壤与大气之间的水热交换比较频繁.土壤温度的日变化和平均温度对土壤的冻融过程有较大的影响;土壤含水量的多少会极大的影响土壤的冻融过程、土壤热量的分布状况以及地表能量的分配.因此水(湿度)热(温度)相互耦合影响着土壤的冻融过程.

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