热带亚热带植物学报2025，Vol.33Issue(1)：65-73,9.DOI:10.11926/jtsb.4855
亚热带常绿阔叶林根系生物量和形态特征对长期施氮的响应
Response of Root Biomass and Root Morphology to Long-term Nitrogen Application in Subtropical Evergreen Broad-leaved Forest
摘要
Abstract
In order to explore the survival strategies of forest ecosystems under environmental change and predict the response mode of roots under the background of long-term nitrogen(N)deposition,two treatments,including control and N addition[80 kg N/(hm2·a)],were set up in subtropical natural evergreen broad-leaved forest to study the effects of long-term N addition on root biomass,specific root length,specific surface area and tissue density.The results showed that long-term N addition had no significant effect on root biomass and its root biomass reduction coefficient β(P>0.05),the vertical distribution characteristics of root biomass did not change significantly(there was no significant difference between biomass accumulated in different soil layers).The root biomass density of different diameter classes under control and N addition showed the same trend with soil layer,but the interaction between soil layer and diameter class had a significant effect on root biomass.Long-term N addition significantly increased 0-1 mm fine specific root length.However,long-term N addition significantly decreased the tissue density and was not affected by diameter class.However,N addition had no significant effect on the specific surface area of roots,and this change was an overall trend at the community level.At the community level,long-term N addition had no significant effect on the root biomass and vertical distribution of subtropical evergreen broad-leaved forest,which was consistent with the changes in total carbon(C),N and phosphorus(P)contents in soil with soil layer.However,N addition for 11 years increased the specific root length and decrease the tissue density,and the root resource acquisition strategy of some species changed to a rapid acquisition strategy.Therefore,under the background of long-term N deposition,roots would respond to nutrient changes by increasing specific root length and decreasing tissue density.关键词
氮添加/根系生物量/根系消减系数/根系形态特征/养分获取策略Key words
N addition/Root biomass/Regression coefficient β/Root morphology/Nutrient absorption strategy引用本文复制引用
王硕,张进如,姚晓东,杜英杰,高红,陈铭,王小红,陈光水..亚热带常绿阔叶林根系生物量和形态特征对长期施氮的响应[J].热带亚热带植物学报,2025,33(1):65-73,9.基金项目
国家重点研发计划子课题(2021YFD220040303),福建省自然科学基金青年创新项目(2023J05118)资助This work was supported by the National Key R&D Program of China(Grant No.2021YFD220040303),and the Project for Natural Science to Youth Innovation in Fujian(Grant No.2023J05118). （2021YFD220040303）
