论文部分内容阅读
基于2004~2008年的土壤温度和湿度等数据,分析了盘锦芦苇(Phragmites australis)沼泽的土壤冻融过程及其浅层土壤的水热特征。结果表明,盘锦芦苇沼泽土壤温度变幅随着土壤深度增加而减小;土壤冻融期一般从12月初开始,至3月末或4月初结束。土壤冻融过程表现为单向冻结、双向消融的特征,总体上冻结过程慢,消融过程快。日冻融循环(土壤夜间冻结,白天消融)持续时间较短,冻结期几乎没有明显的日冻融循环,消融期日冻融循环天数不超过10 d。冻融期开始与结束时间、最大冻结深度以及完全冻结期持续时间有显著的年际差异。浅层土壤未冻水含量在完全冻结期低于10%。
Based on the data of soil temperature and humidity from 2004 to 2008, the soil freeze-thaw process of Panjin aphid (Phragmites australis) swamp and the hydrothermal characteristics of shallow soil were analyzed. The results showed that the temperature fluctuation of soil in Panjin reed swamp decreased with the increase of soil depth. The soil freezing and thawing period usually started from early December to the end of March or early April. Soil freezing and thawing process showed one-way freezing, two-way ablation characteristics, the overall slow freezing process, abortion faster. The daily freeze-thaw cycles (soil freezing at night and daytime ablation) have a short duration, with almost no obvious freeze-thaw cycles on the freezing phase and no more than 10 days on the day of ablation. There is a significant interannual difference between the beginning and the end of the freeze-thaw period, the maximum freezing depth, and the duration of the complete freezing period. The amount of unfrozen water in the shallow soil is less than 10% during the full freezing period.