文献类型：期刊文献

英文题名：Limited Effects of Broad-Leaved Tree Species Introduction on Soil Microbial Necromass and Nutrient Limitations in Degraded Chinese Fir Forests

作者：Fu, Zhigao[1,2] Xiao, Yihua[1,2] Liu, Shirong[3,4] Xu, Han[1] Wang, Yan[1,2] Zhu, Huosheng[5]

第一作者：Fu, Zhigao;付志高

机构：[1] Research Institute of Tropical Forestry, Chinese Academy of Forestry, Guangzhou, 510520, China; [2] Pearl River Delta Farmland Shelterbelt Ecosystem Research Station, Guangzhou, 510520, China; [3] Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration, Ecology and Nature Conservation Institute, Chinese Academy of Forestry, Beijing, 100091, China; [4] Baotianman Forest Ecosystem Research Station, Henan, Nanyang, 474350, China; [5] Lechang Forest Farm of Guangdong Province, Guangdong, Lechang, 512200, China

年份：2025

外文期刊名：SSRN

收录：EI(收录号：20250271573)

语种：英文

外文关键词：Ecosystems - Forestry - Nitrogen - Nutrients - Physicochemical properties - Phytochemistry - Random forests - Soil pollution - Soils - Tropics

摘要：BackgroundAs a pivotal silvicultural practice, mixed-species plantations demonstrate enhanced soil nutrient cycling and ecosystem multifunctionality compared to monoculture systems. Nevertheless, critical knowledge gaps persist regarding how microbial necromass dynamics and microbial nutrient limitations respond to specific tree species combinations. To address this, we conducted a comprehensive investigation across 11 plantation types (10 mixed configurations + Cunninghamia lanceolata monoculture) in subtropical China, analyzing soil physicochemical properties, microbial necromass accumulation, and enzymatic stoichiometry. Our objectives were to (1) quantify species-mixing effects on microbial nutrient limitations, and (2) identify dominant drivers of productivity variation.ResultsThose findings revealed that mixing tree species significantly modified most soil parameters (excluding bulk density and C:N ratio) and enzymatic stoichiometric ratios. Monocultures exhibited higher microbial biomass phosphorus (MBP) and qMBP than mixed stands, potentially exacerbating microbial nutrient constraints. Homeostatic analysis showed that MBC and MBN were exhibited non-absolute homeostasis (plastic responses), whereas MBP, MBC:MBN, MBC:MBP and MBN:MBP maintained absolute homeostasis. Moreover, the microbial necromass components (FNC, FNN, BNC and BNN) showed species-dependent responses. Mixed stands (LFP, CHP, MOP) displayed lower necromass accumulation than monocultures. while fungal-derived organic carbon contributing disproportionately compared to bacterial sources in mixed stands. Tri-model analysis (Vector, V-T, Threshold) converged on similar nutrient limitation patterns. Both monoculture and mixed stands primarily experienced nitrogen limitation, though mixing generally intensified N constraints (except in LFP, MOP, SSP configurations). Random forest modeling identified enzymatic activities as critical productivity drivers: LAP activity predicted diameter growth (DBH), while CBH activity influenced height development and stand productivity. This study suggested that variation in soil physicochemical properties is species-dependent. Notably, mixed species does not necessarily enhance soil microbial necromass or alleviate soil nutrient limitation, though the specific mechanisms behind these observations still require further investigation. Moreover, mixed-species stands significantly reduced soil microbial biomass phosphorus and utilization efficiency relative to fir monoculture stands. Furthermore, microbial biomass phosphorus was greater stability than microbial biomass carbon or nitrogen.ConclusionsThese findings highlights the critical role of adopting appropriate tree species for mixed plantations, particularly in transforming degraded fir plantation forests. It also offers new insights into the management and transformation of such plantations and stimulates innovative thinking regarding mixing strategies. ? 2025, The Authors. All rights reserved.