Eff ects of stand condition and root density on fi ne-root dynamics across root functional groups in a subtropical montane forest

作     者：Lin Huang Rudong Zhao Xiaoxiang Zhao Qiuxiang Tian Pengyun Yue Feng Liu Lin Huang;Rudong Zhao;Xiaoxiang Zhao;Qiuxiang Tian;Pengyun Yue;Feng Liu

作者机构：CAS Key Laboratory of Aquatic Botany and Watershed EcologyWuhan Botanical GardenChinese Academy of SciencesWuhan 430074People’s Republic of China University of the Chinese Academy of SciencesBeijing 100049People’s Republic of China 

出 版 物：《Journal of Forestry Research》 (林业研究（英文版）)

年 卷 期：2023年第34卷第3期

页      面：665-675页

核心收录：

学科分类：09[农学] 0903[农学-农业资源与环境] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.32171599 31870465) 

主　　题：Root functional group Root production Root mortality Root turnover Stand condition Badagongshan mountain 

摘      要：Fine roots play key roles in belowground C cycling in terrestrial *** on their distinct functions,fi ne roots are either absorptive fi ne roots(AFRs)or transport fi ne roots(TFRs).However,the function-based fi ne root dynamics of trees and their responses to forest stand properties remain ***,we studied the dynamics of AFRs and TFRs and their responses to stand conditions and root density in a subtropical montane mixed forest based on a 2-a root window ***(±SE)annual production,mortality,and turnover rate of AFRs were 7.87±0.17 m m^(−2)a^(−1),8.13±0.20 m m^(−2)a^(−1)and 2.96±0.24 a^(−1),respectively,compared with 7.09±0.17 m m^(−2)a^(−1),4.59±0.17 m m^(−2)a^(−1),and 2.01±0.22 a^(−1),respectively,for *** production and mortality of fi ne roots were signifi cantly higher in high root-density sites than in low-root density sites,whereas the turnover of fi ne roots was faster in the low root-density ***,root density had a larger positive eff ect than other environmental factors on TFR production but had no obvious impact on AFR *** species diversity had an apparent positive eff ect on AFR production and was the crucial driver of AFR production,probably due to a complementary eff ect,but had no evident impact on *** tree density and tree species diversity were positively correlated with the mortality of AFRs and negatively related to the turnover of TFRs,suggesting that higher root density caused stronger competition for rooting space and that plants tend to reduce maintenance costs by decreasing TFR *** fi ndings illustrated the importance of root functional groups in understanding root dynamics and their responses to changes in environmental conditions.