论文部分内容阅读
对辽东丘陵区腰堡乡林下的棕壤进行了调查研究,结果表明:造林后二十年左右地面就能恢复2～6cm厚完整的枯枝落叶层,控制了地表迳流的形成。土壤性状变化与邻近草被下的棕壤相比,土壤有机质和速效养分量有不同程度的增长,有的有机质量增长0.8倍,土壤孔性也得到改善。但是,土体浅薄、针叶林下土壤酸化(最低pH5.6)及紧实的粘淀层(最高紧实度达50kg/cm~3)是林木生长的土壤限制因素。要因土选择适宜树种发展针阔混交林,在土体的浅位著有极紧实的粘淀层,造林时应加以破碎。
The investigation of brown earth in the undergrowth of Liaobu County in the hilly area of Liaodong Mountain showed that after 20 years of afforestation, intact litter layer of 2 ~ 6cm in thickness could be recovered and the formation of surface tawny flow was controlled. Compared with the brown soil under adjacent grassland, soil organic matter and available nutrient content increased to some extent, some of the organic matter increased by 0.8 times and the soil porosity was also improved. However, soil thinning, soil acidification under coniferous forest (minimum pH5.6) and tight adhesive layer (maximum compaction of 50kg / cm ~ 3) are the limiting factors of forest growth. Due to the selection of suitable soil for the development of coniferous and broad-leaved forest, in the shallow soil with a very tight sticky layer, afforestation should be broken.