文献类型：期刊文献

英文题名：Productivity Dynamics in Chinese Fir Plantations: The Driving Role of Plant-Soil-Microbe Interactions in Northern Subtropical China

作者：Wang, Lijie[1,2] Sun, Honggang[1] Zhang, Jianfeng[1] Dong, Linshui[3]

第一作者：Wang, Lijie

通信作者：Zhang, JF[1];Dong, LS[2]

机构：[1]Chinese Acad Forestry, Res Inst Subtrop Forestry, Hangzhou 311400, Peoples R China;[2]Nanjing Forestry Univ, Coll Ecol & Environm, Nanjing 210037, Peoples R China;[3]Shandong Univ Aeronaut, Shandong Key Lab Ecoenvironm Sci Yellow River Delt, Binzhou 256603, Peoples R China

年份：2025

卷号：16

期号：12

外文期刊名：FORESTS

收录：;EI(收录号：20260119844551);Scopus(收录号：2-s2.0-105026118440);WOS:【SCI-EXPANDED(收录号:WOS:001647220100001)】；

基金：This study was financially supported by the National Key Technologies Research and Development Program of China (grant no. 2021YFD2201303-03).

语种：英文

外文关键词：Cunninghamia lanceolata; Chinese fir; nutrient; microbial community; soil enzyme; stand productivity

摘要：Chinese fir (Cunninghamia lanceolata) is a cornerstone timber species in southern China. However, yet its plantation productivity frequently declines under successive rotations, threatening long-term sustainability. While belowground processes are suspected drivers, the mechanisms-particularly plant-soil-microbe interactions-remain poorly resolved. To address this, we examined a chronosequence of C. lanceolata plantations (5, 15, 20, and 30 years) in Jingdezhen, Jiangxi Province, integrating soil physicochemical assays, high-throughput sequencing, and extracellular enzyme activity profiling. We found that near-mature stands (20 years) exhibited a 60.7% decline in mean annual volume increment relative to mid-aged stands (15 years), despite continued increases in individual tree volume-suggesting a strategic shift from resource-acquisitive to nutrient-conservative growth. Peak values of soil organic carbon (32.87 gkg-1), total nitrogen (2.51 gkg-1), microbial biomass carbon (487.33 mgkg-1), and phosphorus (25.65 mgkg-1) coincided with this stage, reflecting accelerated nutrient turnover and intensified plant-microbe competition. Microbial communities shifted markedly over time: Basidiomycota and Acidobacteria became dominant in mature stands, replacing earlier Ascomycota and Proteobacteria. Random Forest and Partial Least Squares Path Modeling (PLS-SEM) identified total nitrogen, ammonium nitrogen, and total phosphorus as key predictors of productivity. PLS-SEM further revealed that stand age directly enhanced productivity (beta = 0.869) via improved soil properties, but also indirectly suppressed it by stimulating microbial biomass (beta = 0.845)-a "dual-effect" that intensified nutrient competition. Fungal and bacterial functional profiles were complementary: under phosphorus limitation, fungi upregulated acid phosphatase to enhance P acquisition, while bacteria predominately mediated nitrogen mineralization. Our results demonstrate a coordinated "soil-microbe-enzyme" feedback mechanism regulating productivity dynamics in C. lanceolata plantations. These insights advance a mechanistic understanding of rotation-associated decline and underscore the potential for targeted nutrient and microbial management to sustain long-term plantation yields.