张海宏. 2017. 青藏高原典型湿地土壤冻结、融化期间的陆面特征[J]. 气象学报, ():-, doi:10.11676/qxxb2017.034
青藏高原典型湿地土壤冻结、融化期间的陆面特征
Land Surface Features of Typical Wetland at Tibetan Plateau during Soil Freezing and Melting Period
投稿时间:2016-10-24  最后修改时间:2017-02-09
DOI:10.11676/qxxb2017.034
中文关键词:  青藏高原  湿地  冻土  陆面特征
英文关键词:Tibetan Plateau  wetland  frozen soil  land surface features
基金项目:
作者单位E-mail
张海宏 青海省气象科学研究所 pkuzhh@163.com 
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中文摘要:
      利用玉树隆宝湿地2015年7月~2016年7月的观测资料,分析了土壤冻结、融化前后土壤温湿度和地表能量收支特征,结果表明:冻土持续时期为12月至次年4月,深层土壤的冻结较浅层土壤滞后,融化过程快于冻结过程,5~40cm土壤全部冻结历时51天,全部融化历时19天。土壤体积含水量年变化幅度达0.6 m3?m-3。冻结过程5~40cm土壤体积含水量下降,融化过程5~10cm土壤体积含水量升高。土壤冻结之后,感热通量白天的值升高,潜热通量白天的值降低,净辐射和土壤热通量均降低,土壤热通量日变化幅度增大。土壤融化之后,潜热通量、净辐射和土壤热通量白天的值升高。地表反照率、波文比、土壤热导率和土壤热扩散率冻结后增大融化后减小,土壤热容量冻结后减小融化后增大。
英文摘要:
      Using observed data at Longbao wetland, Yushu from Jul 2015 to Jul 2016, features of soil temperature, soil moisture, surface energy budget and material exchange were analyzed. The results show that freezed soil period lasts from Dec to Apr next year. Deeper soil freezes later than upper soil. Melting process is faster than freezing process. 5~40cm soil freezes entirely for 51 days and melts entirely for 19 days. Annual range of soil moisture is 0.6 m3.m-3. 5~40cm soil moisture decreases during freezing period and 5~10cm soil moisture increases during melting period. After freezing, sensible heat flux increases while latent heat flux decreases at daylight, net radiation and soil heat flux all decrease, daily range of soil heat flux gets higher and heat is transferred upwards. After melting, latent heat flux, net radiation and soil heat flux increase at daylight, heat is transferred upwards at night and downwards at daylight. Surface albedo, bowen ratio, soil thermal conductivity and soil thermal diffusivity increase after freezing and decrease after melting. Soil thermal capacity decreases after freezing and increase after melting. The abilities of soil absorbing carbon and discharging water vapour weaken after freezing and strengthen after melting.
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