文献类型：期刊文献

英文题名：Spatiotemporal Dynamics of Fine Root Biomass in Chinese Fir (Cunninghamia lanceolata) Stumps and Their Impacts on Soil Chemical Properties

作者：Bao, Yinmanda[1,2,3] Wang, Xu[1,2] Guo, Hao[1,2,4] Zhou, Guangyi[1,2] Chen, Yuehua[2,5]

第一作者：Bao, Yinmanda

通信作者：Wang, X[1];Wang, X[2]

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Peoples R China;[2]Nanling Mts China, Beijiangyuan Natl Forest Ecosyst Res Stn, Guangzhou 510520, Peoples R China;[3]Nanjing Forestry Univ, Coll Forestry, Nanjing 210037, Peoples R China;[4]Hainan Univ, Coll Forestry, Haikou 570100, Peoples R China;[5]Xishan State Forest Farm, Chenzhou 423000, Linwu County, Peoples R China

年份：2025

卷号：16

期号：2

外文期刊名：FORESTS

收录：;EI(收录号：20250917949054);Scopus(收录号：2-s2.0-85218444616);WOS:【SCI-EXPANDED(收录号:WOS:001430844300001)】；

基金：This research was funded by the National Key R&D Program of China (grant number 2024YFF1306602).

语种：英文

外文关键词：stump; fine root biomass; spatiotemporal dynamics; fine root loss coefficient; soil chemical properties; Nanling Mountain

摘要：Stumps are residuals from artificial forest harvesting, persist in forest ecosystems, and have garnered attention for their ecological roles in soil and water conservation, carbon sequestration, and forest regeneration. However, the spatiotemporal dynamics of stump fine root biomass and their impact on soil nutrient cycling remain unclear. This study focuses on the fine roots of Chinese Fir (Cunninghamia lanceolata) stumps generated during the construction of national reserve forests at Xishan State Forest Farm, Linwu County, Hunan Province, from 2014 to 2022. Employing a space-for-time substitution approach, we investigated the spatiotemporal dynamics of fine root biomass (FRB) and its effects on soil chemical properties. The results indicated that the Chinese Fir stump FRB significantly differed with increasing residual time across various soil layers and distances, with an average annual loss rate of 8.40%-9.96%. The living fine root biomass (LFRB) was predominantly concentrated in the 0-20 cm soil layer and decreased with increasing soil depth. Initially, the LFRB was closer to the stumps; however, this proximity effect diminished over time. There were no significant differences in the fine root loss coefficients between layers, within the vertical soil profile with 95% root loss over a time span of 15.1-15.9 years. However, there were horizontal differences, with a 95% root loss over a time span of 13.7-17.0 years. The changes in soil organic matter (SOM) and total nitrogen (STN) content over the study period exhibited a trade-off relationship with the loss of LFRB, with SOM and STN peaking 1 year after the peak of dead fine root biomass (DFRB), suggesting a combined effect of living root exudates and dead root decomposition on SOM and STN enhancement. The trend of LFRB loss was generally inverse to the changes in the soil's total phosphorus (STP) content, which gradually increased with extended stump retention, indicating that stumps provide a long-term source of phosphorus for the soil. The study also revealed that living fine roots of Chinese Fir stumps can persist in forest soils for a relatively long time and that their biomass dynamics positively affect soil nutrients and carbon storage. These findings provide theoretical support for forest management and suggest that retaining stumps in post-harvest forest management can maintain soil fertility and ecological functions.