晋西北风沙区植物功能性状对人工柠条林生产力的影响  

Effect of plant functional traits on productivity of artificial Caragana korshinskii forest in the windy⁃sandy region of northwest Shanxi province,China

作　　者：李亚杰 赵峰侠 唐学娟 冀雯霞 王国华 缑倩倩 段萱 王永吉 LI Ya-jie;ZHAO Feng-xia;TANG Xue-juan;JI Wen-xia;WANG Guo-hua;GOU Qian-qian;DUAN Xuan;WANG Yong-ji(College of Geographical Sciences,Shanxi Normal University,Taiyuan 030000,China;School of Life Sciences,Shanxi Normal Univer-sity,Taiyuan 030000,China)

机构地区：[1]山西师范大学地理科学学院,太原030000 [2]山西师范大学生命科学学院,太原030000

出　　处：《西南农业学报》2023年第3期647-654,共8页Southwest China Journal of Agricultural Sciences

基　　金：山西省面上青年基金项目(201901D211387);国家自然科学基金项目(41807518,41801027);山西师范大学校级自然科学基金项目(02080163)。

摘　　要：【目的】探究晋西北风沙区人工柠条林(Caragana korshinskii)功能性状对生产力的影响,揭示人工柠条林生态功能退化机制,以期为该区植被管理及生态安全的可持续性提供理论指导。【方法】利用一般回归模型和随机森林回归模型探讨植物功能性状对不同林龄人工柠条林生产力的影响。【结果】①随着林龄的增加,人工柠条林的生产力和地上生物量呈先增加后降低趋势,18年后出现退化现象;②人工柠条林茎叶比(R^(2)=0.277,P=0.000)、基径(R^(2)=0.404,P=0.000)、分枝数(R^(2)=0.269,P=0.000)、株高(R^(2)=0.395,P=0.000)、纵截面积(R^(2)=0.211,P=0.001)、叶面积(R^(2)=0.314,P=0.000)、叶片碳含量(R^(2)=0.284,P=0.000)、叶干重(R^(2)=0.233,P=0.001)、枝干重(R^(2)=0.211,P=0.001)均与生产力呈极显著正相关;③茎叶比(R^(2)=0.287,P=0.000)、纵截面积(R^(2)=0.318,P=0.000)、叶干重(R^(2)=0.366,P=0.000)、枝干重(R^(2)=0.992,P=0.000)与地上生物量呈极显著相关,但其它功能性状与地上生物量未呈显著相关性(P>0.05);④随机森林回归模型的研究显示,茎叶比(11.59)、基径(9.82)、枝干重(9.18)是影响其生产力变化的主要功能性状,枝干重(22.59)、叶干重(12.87)、纵截面积(4.58)是影响地上生物量的主要功能性状。【结论】与枝条相关的功能性状是影响晋西北风沙区柠条林生产力和地上生物量的主要机制之一,而叶片性状的影响相对较弱,在未来人工柠条林的管理中应着重促进叶片性状的发挥。【Objective】Through the effects of functional traits of artificialCaragana korshinskiiforest on the productivity in the windy⁃sandy region of northwest Shanxi province,the mechanism of ecological function degradation of artificialC.korshinskiiforest was revealed in order to provide theoretical guidance for the sustainability of vegetation management and ecological security in the region.【Method】The effects of plant functional traits on productivity of artificialC.korshinskiiforest stand of different ages were studied by general regression model and ran⁃dom forest regression model.【Result】(i)With the increase of stand age,the productivity and aboveground biomass of artificialC.korshinskii forest indicated a trend of increasing first and then decreasing,and the degradation occurred after 18 years;(ii)ArtificialC.korshinskiiforest stem⁃leaf ratio(R^(2)=0.277,P=0.000),branch diameter(R^(2)=0.404,P=0.000),branch number(R^(2)=0.269,P=0.000),plant height(R^(2)=0.395,P=0.000),longitudinal cross⁃sectional area(R^(2)=0.211,P=0.001),leaf area(R^(2)=0.314,P=0.000),leaf carbon content(R^(2)=0.284,P=0.000),leaf dry weight(R^(2)=0.233,P=0.001),branch dry weight(R^(2)=0.211,P=0.001)were all extremely significantly positive correlated with productivity.(iii)Stem⁃leaf ratio(R^(2)=0.287,P=0.000),longitudinal cross⁃sectional area(R^(2)=0.318,P=0.000),leaf dry weight(R^(2)=0.366,P=0.000)and branch dry weight(R^(2)=0.992,P=0.000)were signifi⁃cantly correlated with aboveground biomass,but there was no significant correlation between other functional traits and aboveground biomass(P>0.05).(iv)The results of the random forest regression model indicated that stem⁃leaf ratio(11.59),branch diameter(9.82),and branch dry weight(9.18)were the main functional traits that affected its productivity.The branch dry weight(22.59),leaf dry weight(12.87)and longitudinal cross⁃sectional area(4.58)were the main functional traits that affected aboveground biomass.【Conclusion】Func⁃tional traits related to shoots were one

关 键 词：晋西北风沙区 人工柠条林 功能性状 生产力 随机森林回归模型 

分 类 号：K903[历史地理—人文地理学]