岷江干旱河谷不同造林模式辐射松人工林物种多样性研究  

Research on Species Diversity of Pinus radiata Plantation under Different Afforestation Models in Dry-hot Valley of the Minjiang River

作　　者：贺维[1] 李田 张炜[1] 吴世磊[1] 苏宇 鄢武先[1] 尤继勇[1] HE Wei;LI Tian;ZHANG Wei;WU Shilei;SU Yu;YAN Wuxian;YOU Jiyong(Sichuan Key Laboratory of Ecological Restoration and Conservation for Forest and Wetland,Sichuan Academy of Forestry,Chengdu 610081,China;Xuankou Town Forestry Workstation,Wenchuan 623001,China)

机构地区：[1]四川省林业科学研究院,森林和湿地生态恢复与保育四川重点实验室,四川成都610081 [2]汶川县漩口镇林业工作站,四川汶川623001

出　　处：《四川林业科技》2021年第4期61-67,共7页Journal of Sichuan Forestry Science and Technology

摘　　要：该实验采用典型样地法,在岷江干旱河谷汶川、理县、茂县,对辐射松纯林、辐射松+岷江柏针叶混交林、辐射松+刺槐+岷江柏针阔混交林物种多样性进行研究。结果表明:(1)辐射松人工林乔木层常见有伴生树种臭椿;灌木层有优势种胡枝子;草本层蒿属植物有较大更新潜力;物种丰富情况总体表现为草本层>灌木层>乔木层,林下以菊科、禾本科、豆科为主。(2)5~20年间,随着时间延长,辐射松纯林平均树高、胸径生长速度加快,但林下灌草物种数量逐渐减少,植被盖度降低;辐射松+岷江柏针叶混交林平均树高、胸径生长量偏低,林下灌草物种数量变化不大;辐射松+刺槐+岷江柏针阔混交林平均树高、胸径生长量增加缓慢,但林下灌草物种多样性和生物量呈上升趋势。(3)在岷江干旱河谷造林实践中,可以将密度适宜的辐射松+刺槐+岷江柏针阔混交林作为主要造林模式,对于待抚育的辐射松纯林,可以间伐后补植刺槐、臭椿、胡枝子等乡土树种,增加物种多样性。According to the field experiment,the species diversity of Pinus radiata pure forest,Pinus radiata and Cupressus chengiana mixed forest,Pinus radiata,Cupressus chengiana and Robinia pseudoacacia mixed forest was studied in Wenchuan,Lixian and Maoxian dry-hot valleys of the Minjiang River.The results showed that:(1)Ailanthus altissima was the common accompanying tree species in the tree layer of P.radiata plantation,Lespedeza bicolor was the dominant species in the shrub layer,and Artemisia had great regeneration potential in the herb layer.The species richness was in the order of herb layer>shrub layer>tree layer,and Asteraceae,Gramineae and Leguminosae were the dominant species under the forest.(2)During the time of 5—20 years,with the extension of time,the growth of average tree height and diameter at breast height(DBH)of P.radiata pure forest increased,but the number of shrub and herb species and vegetation coverage decreased gradually.The growth of average tree height and DBH of P.radiata and C.chengiana mixed forest was low,and the number of shrub and herb species under the forest had little change.The growth of average tree height and DBH of P.radiata,C.chengiana and R.pseudoacacia mixed forest increased slowly,but the species diversity and biomass of shrub and herb under the forest showed an upward trend.(3)In the practice of afforestation in the dry-hot valley of the Minjiang River,P.radiata,C.chengiana and R.pseudoacacia mixed forests with suitable density could be used as the main afforestation model.For the P.radiata pure forests to be tending,native tree species such as R.pseudoacacia,A.altissima and L.bicolor were preferred to be replanted after thinning to increase species diversity.

关 键 词：干旱河谷 辐射松人工林 物种多样性 

分 类 号：S718.5[农业科学—林学]