不同经营世代刺槐人工林多功能经营的密度管理图研建

Research and development of density management map for multifunctional management of Robinia pseudoacacia plantations with different generations of management

【目的】建立刺槐人工林多功能林分密度管理图,以实现对不同培育目的刺槐林的科学合理经营,为森林经营过程中的产量预测和抚育管理方案制定提供科学依据。【方法】以河南省洛宁县国有吕村林场的刺槐人工林为研究对象,针对不同经营世代的刺槐林,设置固定样地和临时样地,对胸径2 cm以上的林木进行每木检尺。测量指标包括胸径、树高、株数等,并测定刺槐一代林和二代林固定样地的土壤最大持水量,同时计算刺槐林分的碳储量。【结果】研究拟合了刺槐的最优树高生长曲线,建立了由等树高线、等直径线、等疏密度线、最大密度线以及自然稀疏线组成的林分密度管理图,最终得到了林分生产力、固碳和水源涵养能力的密度管理图。【结论】结合刺槐树高生长曲线,阐述了刺槐林分密度管理图在产量预估、资源清查和疏伐作业设计方面的应用方法。根据可靠性验证结果,本研究得出的模型适用于豫西丘陵区的刺槐人工林。

[Objective]This study established a multifunctional forest density management map for Robinia pseudoacacia plantations to achieve scientific and rational management of R.pseudoacacia forests with different cultivation purposes,and provide scientific basis for yield prediction and tending management plan formulation in forest management processes.[Method]The fixed and temporary sample plots of R.pseudoacacia plantations,which located in the State-Owned LüVillage Forest Farm in Luoning County,Henan Province of northern China were set up for different management generations of R.pseudoacacia.Each tree was measured,with indexes including DBH,tree height and the number of trees,and the maximum soil water capacity of fixed sample plots in the first and second generation of R.pseudoacacia forests was determined.Additionally,the carbon storage of R.pseudoacacia stands was calculated.[Result]The optimum tree height growth curve of R.pseudoacacia was fitted,and the stand density management map composed of equivalent tree height lines,equivalent diameter lines,equivalent thinning density lines,maximum density lines and natural sparse line was established.Finally,the density management map of stand productivity,carbon sequestration and water conservation ability was obtained.[Conclusion]In terms of height growth curve of R.pseudoacacia tree,the application of R.pseudoacacia stand density management map in yield prediction,resource inventory and thinning operation design is analyzed.According to the reliability verification results,the model obtained in this study is suitable for R.pseudoacacia plantations in the hilly area of western Henan Province of northern China.