不同冠层形态树木植株冠幅内土壤解冻过程研究

In order to study the process of soil thawing within the crown in different canopy morphological trees plant, the Amygdalus triloba(spherical deciduous shrubs), Eucommia ulmoides Oliver(flat topped deciduous trees), Picea wilsonii Mast (pyramid evergreen trees) and Sabina chinensis(cylindrical evergreen trees), 4 common canopy morphological trees plant in Northeast China were selected to monitor the soil thawing depth in the spring thawing period. The results showed that: (1) The average soil thawing depth is decline in the order of Flat topped deciduous tree, Spherical deciduous shrub, Pyramid evergreen tree and Cylindrical evergreen tree. (2) The evergreen trees have good buffer effects on temperature variation while the soil thawing of deciduous plants are sensitive to temperature change. (3) The average soil thawing depth of all plants in the southwest was greater than that in the northeast generally. (4) The average soil thawing depth from plants root to canopy edge was increasing, and the average variance of average soil thawing depth between the inner and outer layers is spherical deciduous shrubs> pyramid evergreen trees> cylindrical evergreen trees > flat topped deciduous trees.