Fine roots are the most active and functional component of root systems and play a significant role in the acquisition of soil resources. Density is an important structural factor in forest plantations but information on changes in fine roots along a density gradient is limited. In this study, plantations of black locust ( Robinia pseudoacacia L.) and Chinese pine ( Pinus tabuliformis Carr.) with four density classes were analyzed for the influence of soil and leaf traits on fine root growth. Fine root biomass increased with stand density. High fine root biomass was achieved through increases in the fine root production and turnover rate in the high-density black locust plantations and through an increase in fine root production in the pine plantations. In the high-density Chinese pine stand, there was a high fine root turnover which, coupled with high fine root production, contributed to a high fine root biomass. Overall, fine root production and turnover rate were closely related to soil vol-umetric water content in both kinds of plantations, while fine root biomass, especially the component of necromass, was related to soil nutrient status, which refers to phosphorous content in black locust plantations and nitrogen content in Chinese pine plantations. There was a close linkage between leaf area index and fine root dynamics in the black locust plantations but not in the pine plantations.

Meimei Sun;Bo-Chao Zhai;Qiu-Wen Chen;Guoqing Li;Sheng Du

State Key Laboratory of Soil Erosion and Dryland Farming On the Loess Plateau,Northwest A&F University,Yangling,Shaanxi 712100,People's Republic of China;College of Forestry,Northwest A&F University,Yangling,Shaanxi 712100,People's Republic of China;Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resources,Yangling,Shaanxi 712100,People's Republic of China

林业研究（英文版）

[1]Meimei Sun;Bo-Chao Zhai;Qiu-Wen Chen;Guoqing Li;Sheng Du-.Response of density-related fine root production to soil and leaf traits in coniferous and broad-leaved plantations in the semiarid loess hilly region of China)[J].林业研究（英文版）,2022(03):1071-1082

umetric,necromass

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