青藏高原东北边缘云杉-巴山冷杉林火烧迹地草本植物群落构建机理  

Mechanism of herbaceous community assembly in a burned area of Picea asperata-Abies fargesii forest on the northeastern margin of the Qinghai-Tibetan Plateau

作　　者：杨欣怡 杨富强 周旭姣 王明军 黄海霞[1] 鲁松松 张晓玮 杜伟波 王旭虎 田青[1,5] 赵安 贺万鹏 周晓雷 YANG Xin-yi;YANG Fu-qiang;ZHOU Xu-jiao;WANG Ming-jun;HUANG Hai-xia;LU Song-song;ZHANG Xiao-wei;DU Wei-bo;WANG Xu-hu;TIAN Qing;ZHAO An;HE Wan-peng;ZHOU Xiao-lei(College of Forestry,Gansu Agricultural University,Lanzhou 730070,China;Landscape Engineering,Gansu Forestry Polytechnic,Tianshui 741020,China;Pratacultural College,Gansu Agricultural University,Lanzhou 730070,China;Luoda Protection Station of Gansu Bailongjiang Axia Provincial Nature Reserve Management and Protection Center,Zhouqu 746300,China;Jinchang Municipal People’s Government,Jinchang 737100,China;Qiandongnan Institute of Forestry,Kaili 556000,China)

机构地区：[1]甘肃农业大学林学院,甘肃兰州730070 [2]甘肃省林业职业技术学院园林工程学院,甘肃天水741020 [3]甘肃农业大学草业学院,甘肃兰州730070 [4]甘肃白龙江阿夏省级自然保护区管护中心洛大保护站,甘肃舟曲746300 [5]金昌市人民政府,甘肃金昌737100 [6]贵州黔东南州林业科学研究所,贵州凯里556000

出　　处：《草业学报》2023年第8期40-47,共8页Acta Prataculturae Sinica

基　　金：国家自然科学基金(31860197);甘肃省财政厅和甘肃省GEF/OP12项目(03619078)资助

摘　　要：群落构建机制是生态学研究的核心论题。生态位理论和中性理论是阐明群落构建的两种主要理论,但这两种理论分别强调的环境过滤和扩散限制对群落构建的影响尚存争议。该研究以青藏高原东北边缘云杉-巴山冷杉林火烧迹地不同演替阶段草本群落为研究对象,应用扩散-生态位连续体指数(DNCI)和校正随机率(MST),分析不同演替阶段草本植物群落的主导构建机制。研究结果显示:1)5、15和23 a群落与Climax群落之间的DNCI分别为-22.6169、-21.7507和-8.2594,都远小于0,表明不同演替阶段草本植物群落构建的主要驱动作用是扩散过程;2)5 a-Climax组和23 a-Climax组的MST值均高于50%阈值线,这表明随机性过程在两组群落构建中均占支配地位;对于15 a-Climax组,15 a的MST值为0.6664,Climax的MST值等于0.4927,说明15 a植物群落构建以随机性为主,而Climax群落构建以确定性为主;由于15 a的MST值远高于50%,而Climax的MST值较接近于50%的阈值,也可说明15 a-Climax组群落构建仍以随机性为主。在青藏高原东北边缘云杉-巴山冷杉林火烧迹地,随机扩散主导了草本植物群落的构建过程。Many competing theories exist with respect to the mechanisms behind plant community assembly.Niche theory and neutral theory are among the two most widely proposed mechanisms.In this study,we focused on herbaceous communities at different successional stages in a burned area of Picea asperata-Abies fargesii forest on the northeastern margin of Qinghai-Tibetan Plateau.We aimed to elucidate the mechanism of community assembly through calculation of dispersal-niche continuum index(DNCI)and modified stochasticity ratio(MST).Results show that,1)DNCI between communities of 5,15,23 years and Climax were-22.6169,-21.7507 and-8.2594,respectively.These values were all significantly less than 0,and indicate that the main driving effect of herbaceous community assembly at different succession stages was the dispersal process;2)MST values of both the 5 yr-Climax group and the 23 yr-Climax group were above the 50%,which indicated that the stochastic process dominated the community assembly in both groups.For the 15 yr-Climax group,the MST value of 15 yr was 0.6664,and the MST value of Climax vegetation was 0.4927,indicating that the plant community assembly of 15 yr is dominated by stochasticity,while the assembly of Climax community is deterministic;since the MST value of 15 yr is much higher than 50%,and the MST value of Climax is close to the threshold of 50%,it can also be shown that the community assembly of the 15 yr-Climax group is still dominated by stochasticity.In conclusion,in a burned area of P.asperata-A.fargesii forest on the northeastern margin of the Qinghai-Tibetan Plateau,stochasticity dispersal dominated the herbaceous community assembly.

关 键 词：草本植物 群落构建 云杉-巴山冷杉林 火烧迹地 青藏高原东北边缘 

分 类 号：Q948.1[生物学—植物学]