不同埋干深度对1年生楸树生长和生物量的影响

[目的]研究4种埋干深度对1年生豫楸1号生长和生物量的影响。[方法]埋干深度设计4种处理(10、20、30和40 cm),各处理分别选3株平均木,调查其一级侧枝的数量、长度和粗度,测量其胸径、树高及地上和地下生物量。[结果]4种埋干深度间,1年生楸树的侧枝数量、长度和粗度差异不显著,供试材料以埋干10 cm的平均枝条数和平均枝条粗度最大,埋干30 cm的平均枝条长度最大。各处理间胸径和树高总体随埋干深度的增大而变小,胸径差异呈显著性,树高差异不显著。地上生物量、茎生物量和枝生物量差异处理间达极显著,根生物量间差异显著,地上生物量和根生物量均随埋干深度的增加而减小。[结论]4种埋干深度对参试豫楸1号的胸径和生物量有不同程度的影响,埋干10 cm时,参试材料的胸径和生物量相对最大。

Effects of Different Trunk Buried Depth on Growth and Biomass of One-year Old Catalpa bungei

[Objective] To understand growth and biomass of one-year old Catalpa bungei cl.’Yu-1’under different trunk buried depth.[Method] Four trunk buried depth were designed(10,20,30 and 40 cm),and among each treatment three standard trees were selected,and then their branch number,length and coarseness were investigated,and meanwhile the diameter,height,above and underground biomass were measured.[Result] Among four treatments,the branch amount,length and width had no significant difference of one-year old Catalpa bungei cl.’Yu-1’.The average branch number,width was biggest under 10 centimeter,and the average branch length was the longest under 30 centimeter.The diameter and tree height decreased with buried depth increased.The differences of above-ground biomass,stem biomass and branch biomass among treatments were extremely significant,the differences of root biomass was significant.Above-ground biomass and root biomass decreased with buried depth increased.[Conclusion] There were different influences on diameter and biomass among four trunk buried depths,diameter and biomass were biggest when trunk were buried under 10 centimeter.