间伐追肥对杉木中龄林材种变化的早期效应  

Early Effects of Thinning and Topdressing on Changes of Timber Assortment Structure in Middleaged Cunninghamia lanceolate

作　　者：伍观娣 胡德活[1] 郑会全[1] 王润辉[1] 韦如萍[1] 晏姝[1] 黄荣 邱智雄 WU Guandi;HU Dehuo;ZHENG Huiquan;WANG Runhui;WEI Ruping;YAN Shu;HUANG Rong;QIU Zhixiong(Guangdong Provincial Key Laboratory of Silviculture,Protection and Utilization/Guangdong Academy of Forestry,Guangzhou,Guangdong 510520,China;Guangdong Shaoguan State-owned Forest Farm,Shaoguan,Guangdong 512000,China)

机构地区：[1]广东省森林培育与保护利用重点实验室/广东省林业科学研究院,广东广州510520 [2]韶关市国有韶关林场,广东韶关512000

出　　处：《林业与环境科学》2024年第6期10-17,共8页Forestry and Environmental Science

基　　金：国家重点研发计划项目(2016YFD0600301)。

摘　　要：为构建南岭山区杉木Cunninghamia lanceolate大径材高效培育技术体系,提高南岭山区杉木大径材产量与质量,采用正交设计对杉木中龄林进行间伐与施肥试验,3 a后进行林分生长分析。T检验分析结果显示,处理T-3(间伐后密度1500株·hm^(-2),每株尿素200 g,过磷酸钙600 g)、T-6(间伐后密度1200株·hm^(-2),每株尿素200 g)的单位面积蓄积在处理前、后间分别达显著(P<0.05)、极显著差异(P<0.01)。最优的胸径-树高生长模型拟合为y=3.7838x0.4727。不同材种生长分析结果显示,处理前和处理后各材种总体呈现小径材递减,中径材、大径材递增的趋势。正交试验分析表明,密度控制和追肥效应对杉木中龄林材种结构有影响。间伐后增加大径材出材率最佳因素组合为A3B3C2,即最小密度900株·hm^(-2),每株最大尿素用量200 g和中等水平过磷酸钙300 g;增加大径材出材量最佳因素组合为A3B3C1,即最小密度900株·hm^(-2),每株最大尿素用量200 g和最低水平过磷酸钙0 g。To construct the efficient cultivation technology system of Cunninghamia lanceolate diameter timber in the Nanling mountain area,and improve the yield and quality of large diameter timber of C.lanceolate in the Nanling mountain area,the orthogonal design was used to carry out the thinning and fertilization experiment of C.lanceolate middle-aged forest,and the stand growth was carried out after 3 years.T-test analysis results showed that the unit area accumulation of T-3(After thinning,the density was 1500 plants per hm^(2),with each plant being fertilized with 200 g urea and 600 g calcium superphosphate)and T-6(The density after thinning was 1200 plants per hm^(2),with each plant being fertilized with 200 g)reached significant(P<0.05)and extremely significant difference(P<0.01)before and after treatment,respectively.The optimal DBH-height growth model fitting was y=3.7838x0.4727.The results of growth analysis of different timber assortment structures showed that before and after treatment,timber assortment structures showed a decreasing trend of small diameter timber,and an increasing trend of medium diameter timber and large diameter timber.Orthogonal test analysis showed that the density control and topdressing effect had an effect on the timber assortment structures of C.lanceolate middle age forest.The optimal combination of factors for increasing the yield of large diameter timber was A3B3C2,that is,the minimum density(900 plants per hm^(2)),the amount of urea(200 g per plant),and the medium level of calcium superphosphate(300 g per plant),which is the most conducive to increase the yield of large diameter timber.The best combination of factors to increase the output of large diameter timber was A3B3C1,that is,the minimum density(900 plants per hm^(2)),the amount of urea(200 g per plant),and the minimum level of calcium superphosphate(0 g per plant).

关 键 词：杉木 中龄林 大径材培育 密度控制 施肥控制 

分 类 号：S753[农业科学—森林经理学]