抚育间伐对小黑杨人工林非结构性碳和氮磷钾生态化学计量特征的影响  

Effects of Tending Thinning on Non-Structural Carbon and NPK Ecological Stoichiometric Characteristics in Populus×xiaohei Plantations

作　　者：吕彦飞 牛鉴祺 王树力[1] LÜYanfei;NIU Jianqi;WANG Shuli(College of Forestry,Northeast Forestry University,Harbin 150040,China)

机构地区：[1]东北林业大学林学院,哈尔滨150040

出　　处：《森林工程》2024年第5期62-73,共12页Forest Engineering

基　　金：黑龙江省省级财政林业科研专项(201522);中央高校基本科研业务费专项资金项目(2572020DR04)。

摘　　要：了解不同林龄阶段小黑杨人工林各器官的非结构性碳(NSC)含量和氮(N)磷(P)钾(K)生态化学计量特征及其对抚育间伐的响应,从而为小黑杨人工林的科学经营提供依据。以黑龙江省大庆市红旗林场幼龄和中龄小黑杨人工林为研究对象,建立间伐强度为25%(以株数计)的抚育间伐样地,调查分析抚育间伐对小黑杨人工林各器官NSC含量和NPK生态化学计量的影响特征。研究结果表明,2种林龄小黑杨人工林具有各自不同的NSC含量和NPK生态化学计量分布特征。中龄林树叶、树枝和树根NSC含量较幼龄林分别降低31.76%、21.19%、38.98%(P<0.05)。中龄林树叶N含量较幼龄林增加11.85%(P<0.05)。中龄林树枝、树干和树根P含量分别较幼龄林分别降低17.57%、35.85%、60.11%(P<0.05),树叶、树枝、树干和树根K含量分别较幼龄林分别降低21.05%、34.67%、22.99%、46.22%(P<0.05)。抚育间伐显著影响小黑杨幼龄林树干和树根的NSC含量、中龄林树枝和树根的NSC含量(P<0.05)。抚育后幼龄林树干NSC含量增加29.35%,树根NSC含量降低40.37%;中龄林树枝和树根NSC含量分别增加12.81%、33.51%。抚育间伐显著影响小黑杨幼龄林各器官N含量、树枝K含量、树干P含量和中龄林树叶、树根K含量(P<0.05)。抚育后小黑杨幼龄林树叶、树枝、树干和树根N含量分别增加5.77%、15.68%、53.71%、10.85%,树枝K含量增加36.90%,树干P含量降低19.63%;小黑杨中龄林树叶和树根K含量分别增加20.86%、31.69%。树叶NSC含量与N含量极显著负相关(P<0.01),与K含量间显著正相关(P<0.05);树枝NSC含量与N含量显著负相关,与P含量显著正相关(P<0.05),与K含量极显著正相关(P<0.01);树干NSC含量与N含量极显著正相关(P<0.01);树根NSC含量与N含量极显著负相关,与P含量极显著正相关(P<0.01)。结果表明,林分未进行抚育时,小黑杨幼龄林和中龄林NSC和N、P、K元素在各器官中的分配格局差异明显;�In order to understand the non-structural carbon(NSC)content,nitrogen(N)phosphorus(P)potassium(K)ecological stoichiometric characteristics and their responses to tending thinning in different age stages of Populus×xiaohei,and to provide a basis for scientific management of Populus×xiaohei,the young and middle Populus×xiaohei plantation in Hongqi Forest Farm of Daqing City,Heilongjiang Provinc was studied,the effects of tending thinning on NSC content and NPK ecological stoichiometry in each organ of the plantation were investigated and analyzed by setting up thinning plots with thinning intensity of 25%(based on number of trees).The results showed that there were different NSC content and NPK ecological stoichiometric distribution characteristics of two kinds of Populus×xiaohei plantations.The contents of NSC in the leaf,branch and root of middle-aged forest were decreased by 31.76%,21.19%and 38.98%compared with those of young forest,respectively(P<0.05).The N content of leaf in the middleaged forest was increased by 11.85%compared with that in the young forest(P<0.05).Compared with young forest,the P content of branch,stem and root of middle-aged forest decreased by 17.57%,35.85%and 60.11%,respectively(P<0.05),and the K content of leaf,branch,stem and root decreased by 21.05%,34.67%,22.99%and 46.22%,respectively(P<0.05).Tending thinning significantly affected the NSC content in the stem and root of young forest,and the NSC content in the branch and roots of middleaged forest(P<0.05).NSC content in stem of young forest increased by 29.35%,while NSC content in root decreased by 40.37%.The contents of NSC in branch and root of middle-aged forest increased by 12.81%and 33.51%,respectively.Tending thinning sig nificantly affected N content in organs,K content in branch,P content in stem and K content in leaf and root of young forest(P<0.05).After tending,N content in leaf,branch,stem and root of young forest increased by 5.77%,15.68%,53.71%and 10.85%,respectively,K content in branch increased by 36.90%,and P cont

关 键 词：小黑杨 抚育间伐 林龄 非结构性碳 N∶P∶K计量比 

分 类 号：S753[农业科学—森林经理学]