Stand biomass of Pinus sylvestris var. mongolica plantations benefits from high density monocultures in the boreal zone  

作　　者：Bingming Chen Shensi Liu Jinghua Yu Yanqing Huang Shuai Yu Huanchu Liu Tianyu Zhang Xiangdong Liu Guangze Jin Wei Chen Xingyuan He 

机构地区：[1]CAS Key Laboratory of Forest Ecology and Silviculture,Institute of Applied Ecology,Chinese Academy of Sciences,Shenyang,110016,China [2]University of Chinese Academy of Sciences,Beijing,100049,China [3]Shenyang Arboretum,Chinese Academy of Sciences,Shenyang,110016,China [4]Liaoning Shenyang Urban Ecosystem National Observation and Research Station,Shenyang 110164,China [5]College of Forestry,Shenyang Agricultural University,Shenyang,110866,China [6]Center for Ecological Research,Northeast Forestry University,Harbin,150040,China [7]Key Laboratory of Sustainable Forest Ecosystem Management,Ministry of Education,Northeast Forestry University,Harbin,150040,China [8]Northeast Asia Biodiversity Research Center,Northeast Forestry University,Harbin,150040,China

出　　处：《Forest Ecosystems》2024年第5期650-658,共9页森林生态系统（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2022YFF1300500);the Youth Innovation Promotion Association of CAS(No.2022195).

摘　　要：Pinus sylvestris var.mongolica(P.sylvestris)plantations are extensively established in the boreal zone.Increasing stand biomass of these plantations can effectively enhance carbon stock,which is crucial for mitigating climate change.However,the current understanding of optimizing plantation strategies to maximize stand biomass is primarily derived from experiments in tropical and subtropical zones,which is difficult to extend to the boreal due to substantial climatic differences.Based on a comprehensive dataset from 1,076 sample plots of P.sylvestris plantations in the boreal zone of China,we evaluated the effects of tree species richness and stand density on tree height,diameter at breast height(DBH),and stand biomass to investigate the optimal plantation strategy.Furthermore,we examined how these effects changed with stand age and investigated their relative importance.We found that monocultures at a high stand density of 2,000–2,500ha^(−1) were the optimal plantation strategy to maximize stand biomass(107.5Mg·ha^(−1)),and this held true at almost all stand ages.Unfortunately,this strategy resulted in low species richness and small individual trees(10.6m height and 9.8cm DBH),thus presenting a trade-off.In addition,as stand age increased,the effect of tree species richness on stand biomass shifted from positive to negative,but the effect of stand density was always positive.Overall,stand age had the greatest effect on stand biomass,followed by stand density and then tree species richness.Our findings reveal a distinct plantation strategy for optimizing stand biomass of P.sylvestris plantations in the boreal zone.More importantly,this study highlights that(1)maximizing stand biomass in the boreal zone may compromise tree species richness;(2)net effects of tree species richness on stand biomass are not always positive,as negative selection effects offset positive complementary effects.

关 键 词：Boreal forests Cold region Forestry application Mongolian Scots pine Planting strategy Tree diversity 

分 类 号：S791.253[农业科学—林木遗传育种]