浙江天童森林公园植物群落演替对土壤物理性质的影响

对浙江宁波天童森林公园内的裸地、灌丛、马尾松林、马尾松木荷林、木荷林、栲树木荷林和栲树林等演替阶段土壤物理性质进行了比较分析。结果表明，尽管由于样地坡度和母质等因素的影响，演替群落土壤呈现趋砂性特征，但植物群落进展演替能明显降低土壤容重，阔叶林群落减少的幅度更显著；同时，演替能提高土壤空隙度；土壤含水量、土壤最大持水量、毛管持水量和最小持水量在演替过程中的增长趋势明显；土壤固相率减少，气相率增大。因此，植物群落进展演替能明显降低土壤紧实性，改善土壤通气性及持水性能，呈现出与土壤质地效应相反的变化趋势，促进了土壤肥力的发挥。而土壤物理性质的改善，也有利于群落物种更替和演替进程

Influence of plant community succession on soil physical properties in Tiantong Forest Park, Zhejiang Province\

he physical properties of the plant community succession series in Tiantong Forest Park, Ningbo, Zhejiang Province were compared. Owing to the difference of slopes and soil parent materials, the soils among the succession series exhibited the tendency of getting sand. Even though, soil bulk density decreased distinctly as succession proceeded, especially in broad leaved forest types. On the other hand, soil porosity tended to increase. Furthermore, soil water content, maximun water holding capacity, capillary water holding capacity and minimun water holding capacity showed more distinct increasement pattern. Solid phase ratios decreased and air phase ratios increased during the course of succession. Results from this study implied that progressive succession can reduce soil tightness and improve soil aeration, water permeability and holding capacity, which showed the opposite variation trend with the effect of soil texture, gave play to soil fertility and the amelioration of soil physical properties can also promote the process of forest succession.