萌蘖更新方式对退化刺槐林改造的效果研究

Study on the Effect of Sprouting Regeneration Method on the Transformation of Degraded Robinia Pseudoacacia Forest

为了探索适合在辽西地区退化刺槐林内推广的改造方式,特选择了几种方式开展了改造效果研究。以土壤含水量、根系生物量分布、生物多样性等作为主要的指标进行分析,结果表明,土层0—80 cm内退化刺槐林土壤含水量最高,超过80 cm萌蘖更新刺槐林内的土壤含水量逐渐超过退化刺槐林;各处理根系生物量主要集中在0—30 cm土层中,各处理所占的比例差异不明显;重新营建的蒙古栎林、油松林内生物多样性比萌蘖更新刺槐林及退化刺槐林差,萌蘖更新刺槐林内乔木类型更加丰富。建议在退化的刺槐林内推广自然萌蘖更新的改造模式,可以较低的成本获得较好的经济、生态效益。

In order to explore the transformation methods suitable for promotion in the degraded Robinia pseudoacacia forests in western Liaoning,several methods were selected to carry out the transformation effect research,and the soil water content,root biomass distribution,biodiversity,etc.were used as the main indicators to analyze the results.It shows that the soil moisture content of the degraded Robinia pseudoacacia forest is the highest within the soil layer of 0-80 cm,and the soil moisture content in the regeneration Robinia pseudoacacia forest gradually exceeds that of the degraded Robinia pseudoacacia forest over 80 cm.The root biomass of each treatment is mainly concentrated in the 0-30 cm soil layer.The proportion of each treatment is not significant;the biodiversity in the rebuilt Mongolian oak forest and Pinus tabulaeformis forest is worse than that of the sprouting regeneration Robinia locust forest and the degraded Robinia locust forest.The arbor types in the sprouting regeneration Robinia locust forest are more abundant,and the degraded Robinia pseudoacacia forest is recommended.The forest can promote the transformation model of natural sprouting and renewal,which can obtain better economic and ecological benefits at a lower cost.