不同密度马尾松林下植被和土壤性质

通过对11年生不同密度马尾松林下植物和土壤理化性质的研究，结果表明：林分密度增加，马尾松林下植物的平均高、覆盖度和生物量递减；0—20cm和20—40cm土层的通气度、非毛管孔隙度、毛管孔隙度和总孔隙度递增；0～20cm土层的自然含水量和土壤贮水量递减，20—40cm的土层规律性不明显；0～20cm和20～40cm土层的有机质、全N、全P、水解N和速效P的含量递减。说明林下植物有利于土壤含水量和肥力的改善，为了促进马尾松林地力改善。必须保护和恢复林下植被。

Undergrowth Vegetation and Soil Properties of Pinus massoniana with Different Densities

Undergrowth vegetation and soil properties of 11-year-old Pinus massoniana with different densities were studied.Result shows that:average height,coverage,biomass of undergrowth vegetation decrease with the increase of the stand density;ventilation degree,non-capillary porosity,capillary prosity,total prosity of soil layer of 0-20 cm and 20-40 cm increase;natural water content and soil water storage of soil layer of 0-20 cm decrease;the regularity of soil layer of 20-40 cm is not significant;content of orga...