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2008年5月12日,四川省汶川县发生Ms 8.0、裂度11级的灾难性特大地震,造成了严重的人员伤亡,同时也对森林生态系统造成了严重伤害。在主地震带上的四川省绵阳市,以无林地上未滑坡、滑坡和崩塌3种立地类型的土壤为研究对象,于2009和2010年分别研究了地震后各立地类型不同层次的土壤容重、毛管持水量、毛管孔隙度和非毛管孔隙度。结果如下:(1)大地震后无林地土壤物理性质受影响程度为崩塌>滑坡>未滑坡;(2)经过1 a的自然恢复,各立地类型的土壤容重没有恢复;未滑坡样地和滑坡样地土壤表层(0~10 cm)的毛管持水量、毛管孔隙度和非毛管孔隙度得到有效的恢复,土壤中层(10~20 cm)和深层(20~40 cm)的相应指标虽有相同的变化趋势,但变化并不显著;而崩塌样地由于土壤结构被严重破坏,恢复缓慢。
On May 12, 2008, a catastrophic earthquake with magnitude 8.0 and magnitude of 11 on the Wenchuan County of Sichuan Province caused serious human casualties and caused serious damage to the forest ecosystem. In Mianyang City, Sichuan Province, on the main seismic zone, the soil bulk density at different soil layers of different standing types after the earthquake was studied in 2009 and 2010 respectively with three kinds of non-landslide landslides, landslides and landslides without landslides. Capillary holding capacity, capillary porosity and non-capillary porosity. The results are as follows: (1) The soil physical properties of the non-forest land after the earthquake have been affected by landslide> landslide> non-landslide; (2) After 1-year natural restoration, the soil bulk density of each site type did not recover; Capillary water content, capillary porosity and non-capillary porosity of surface soils (0 ~ 10 cm) of soil samples were effectively recovered. Corresponding indexes of soil middle layer (10 ~ 20 cm) and deep layer (20 ~ 40 cm) However, the changes were not significant. However, the collapsed plots were slow to recover due to the serious destruction of soil structure.