Site Type Classification and Quality Response of Chimonobambusa uitilis Forest in Northern Guizhou Province
Bamboo forest in sub-superior layer is a hot research topic in ecology,and site types and their classification are not only the basis for science-based management of suboptimal bamboo forests,but also a gap and difficulty in the research.This paper investigates 92 Chimonobambusa uitilis(hereinafter referred to as CU)plots in Dalou mountain,located in northern Guizhou province,among which the plots with limestone soil account for 42.39%.The site classification system and control factor levels of CU forest are established using the site factor stripping method,and the quality variation patterns of CU forest and its trees and shrubs in site type regions and between site types are analyzed.The results show that:1)In the CU forest site classification system,the site regions(sub-regions)are the basic units of the national and provincial forest site classification system,while the control factors are large and medium geomorphology and altitude in site type regions,rock group and soil type in site type sub-regions,slope direction,position and gradient in site type groups,thickness of soil AB layer in site types,and thickness of soil A layer and gravel amount in site sub-types;2)Between site type regions,CU forests with different soil types are significantly different in their average DBH,height and density,but not significantly different in stem biomass.The average DBH and height of tall trees are significantly different,but the density is not significantly different.The corresponding index values of shrub are significantly different.Marglef index,Shannon-Winner index and Pielou index of tall trees are significantly different,but Simpsom index of tall trees is not significantly different.Among different levels of site type regions,the corresponding index values of CU forests with different soil types are not significantly different,and some index values of tall trees and shrubs are significantly different.The corresponding index values of CU forest,tall trees and shrubs vary with the changes in the level of site type regions;and 3)Among different levels of site types,the quality index values of CU forests,tall trees and shrubs are not significantly different,and the quality index values of CU forests,trees and shrubs vary with the changes in the level of site types.The results provide scientific evidences for the efficient management of CU forest.
Chimonobambusa uitilissite classificationsite factorstand qualitynorthern Guizhou province
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