红锥+厚荚相思同龄混交林的生长量与土壤肥力研究

Study on the Growth Amount and Soil Fertility of the Same Age Mixed Forest of Castanopsis hystrix and Acacia crassicarpa

对高峰林场红锥+厚荚相思同龄混交林及对照林分红锥纯林采取相同的营林措施,监测2种林分在16~22年龄时在林木生长量、土壤pH值和土壤养分含量等方面的动态变化及差异。结果表明,林分第16年到第22年,混交林和纯林内所有树种高生长和径生长均逐年增加;林分林龄16~19年,红锥+厚荚相思同龄混交林和红锥纯林单位面积蓄积量均逐年增加。林龄20年时间伐,间伐当年混交林和纯林单位面积蓄积量均降低;在间伐后的21~22年,混交林和纯林单位面积蓄积量均逐年增加。红锥纯林单位面积蓄积量增长速度比混交林快,且在期末高出混交林34.7%。混交林pH值高于纯林,表明混交林降酸能力比纯林好。混交林土壤肥力比纯林的高。

The same forest management measures were taken for the same age mixed forest with Castanopsis hystrix+Acacia crassicarpa and the pure forest with dividend cone in the control forest,and the dynamic changes and differences in tree growth,soil pH value and soil nutrient content of the two stands were monitored at the age of 16~22 years.The results showed that the height and diameter growth of all tree species increased year by year from the 16th to the 22nd year in mixed and pure stands.The stand age was 16~19 years,and the stock per unit area of Castanopsis hystrix and Acacia crassicarpa mixed forest and red cone pure forest increased year by year.The stock volume per unit area of mixed forest and pure forest decreased when the forest was intercut for 20 years.In 21~22 years after thinning,the stock per unit area of mixed forest and pure forest increased year by year.The accumulation per unit area of pure Castanopsis hystrix forest increased faster than that of mixed forest,and was 34.7%higher than that of mixed forest at the end of the period.The pH value of mixed forest was higher than that of pure forest,indicating that the acid lowering ability of mixed forest was better than that of pure forest.The soil fertility of mixed forest is higher than that of pure forest.