摘要
利用土壤剖面的温度、湿度观测数据,结合气象资料初步分析了蒙古高原中部典型针茅草原在季节转变过程中(2003～2004年)的土壤冻融过程和土壤含水量分布动态。研究表明,0～150cm深度范围的土壤完全冻结天数为154～160d。冻融日循环主要发生在表层0～5cm。0～30cm土层的土壤含水量变化剧烈,与地温有较好的一致性。0～10cm深度土壤含水量高于其他土层。随着深度的增加,土壤含水量季节波动性变小。冻结过程有利于保持土壤水分,有利于春季草地植被返青。
The dynamics of soil moisture distribution and thawing-freezing process of stipa steppe in central Mongolia during the seasonal transition period （2003 - 2004） were analyzed with the measurement of temperature and moisture in the soil profile combined with the meteorological data. The results show that there is a completely frozen period about 154 - 160 d in the soil profile of 0 - 150 cm. The diurnal freeze/thaw cycle mainly takes place at the ground surface of 0 - 5 cm. The soil moisture in 0 - 30 cm layer changes intensively in the thawing-freezing processes, as well as the soil temperature. In general, the soil water content at 10 cm depth is always higher than those of other depths. The seasonal variation of soil moisture weakened gradually with the increasing soil depth. The frozen soil is favor of keep water, which benefits the regreening of grass in spring.
出处
《土壤学报》
CAS
CSCD
北大核心
2009年第1期46-51,共6页
Acta Pedologica Sinica
基金
中国科学院“百人计划”
国家自然科学基金重大项目(30590381)
日本科学技术振兴机构“东北亚草原大气-水圈-生物圈相互作用研究实验”(RAISE)研究项目共同资助
关键词
冻融过程
土壤含水量
蒙古高原
针茅草地
Thawing-freezing processes
Soil moisture
Mongolian Plateau
Stipa steppe
