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Fine root mortality Increased by Earthquake Induced Landslides

Open Journal of Earthquake Research 2016年第3期5卷 172-176页

作者： Yinping Bai Gang Yang School of Life Science and Engineering Southwest University of Science and Technology Mianyang China College of Agronomy Northwest A&F University Yangling China

This study determined the effects of earthquake induced landslide on fine root mortality. It is useful to understand underground soil process after earthquake. We established 9 plots at each of non-moved and landslide site in Cupressus funebris and Cryptomeria fortunei forest stands near the fault belt of the Wenchuan Earthquake. Fine roots were sampled at 0 - 10 and 10 - 15 cm soil layer using aluminum cylinders (100 cm3). We found that earthquake induced landslide significantly increased fine root mortality in Cupressus funebris and Cryptomeria fortunei forest stands. Fine root biomass also decreased by landslide at 0 - 10 cm soil layer. We observed that the fine root biomass and mortality were various with forest type. There were higher fine root mortality rate (68.4%) and lower fine root biomass (0.48 t/hm2) in Cupressus funebris than the Cryptomeria fortunei soils (0.97 t/hm2 and 37.4%).

关键词： Earthquake Forest Landslide Fine root root mortality

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

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Journal of Forestry Research 2023年第3期34卷 665-675页

作者： Lin Huang Rudong Zhao Xiaoxiang Zhao Qiuxiang Tian Pengyun Yue Feng Liu CAS Key Laboratory of Aquatic Botany and Watershed Ecology Wuhan Botanical GardenChinese Academy of SciencesWuhan 430074People’s Republic of China University of the Chinese Academy of Sciences Beijing 100049People’s Republic of China

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.

关键词： root functional group root production root mortality root turnover Stand condition Badagongshan mountain

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