外生菌根优势度对温带森林土壤碳氮的地上-地下影响机制#br#

doi:10.1093/jpe/rtaf143

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外生菌根优势度对温带森林土壤碳氮的地上-地下影响机制#br#

收稿日期:2025-05-12 接受日期:2025-08-25

Above- and belowground effects of ectomycorrhizal dominance on soil carbon and nitrogen in a temperate forest

Xuemei Wu^1,2,3, Zikun Mao^2,3*, Weijun Sun¹, Yue Chen^2,3, Shuai Fang^2,3, Pengcheng Jiang^2,3, Fei Lin^2,3, Ji Ye^2,3, Mengxu Zhang^2,3, Meihui Zhu^2,3, Xugao Wang^2,3*

¹College of Geography and Environment, Shandong Normal University, Jinan 250014, China.
²CAS Key Laboratory of Forest Ecology and Silviculture, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China.
³Key Laboratory of Terrestrial Ecosystem Carbon Neutrality, Liaoning Province, Shenyang 110016, China.

^*Corresponding authors. E-mail: maozikun@iae.ac.cn (Z.M.); wangxg@iae.ac.cn
(X.W.)

Received:2025-05-12 Accepted:2025-08-25
Supported by:
This work was supported by the National Natural Science Foundation of China (32301344), the National Key Research and Development Program of China (2023YFE0124300), the CAS (Chinese Academy of Sciences) Project for Young Scientists in Basic Research (YSBR-108), the CAS Key Laboratory of Forest Ecology and Silviculture, Institute of Applied Ecology Chinese Academy of Sciences (KLFES2021), the Outstanding Young Scientist Program of Institute of Applied Ecology, Chinese Academy of Sciences (2023000154) and the LiaoNing Revitalization Talents Program (XLYC2402003).

摘要/Abstract

摘要： 在全球变化影响下，温带森林中外生菌根(ECM)树种优势度持续下降，将显著改变土壤碳氮循环过程。然而，目前针对ECM树种优势度如何调控森林地上和地下属性，进而影响森林土壤碳氮的具体机制，仍缺乏系统认识。为此，本研究以长白山温带森林为研究对象，分析了地上属性(如树种多样性、胸高断面积、叶片养分含量)、地下属性(如土壤微生物群落、酶活性)与土壤有机碳(SOC)、土壤氮的关系及其随ECM树种优势度的变化规律。研究结果发现，植物叶片养分含量、胸高断面积等地上属性，以及土壤真菌群落、酶活性等地下属性，均随ECM树种优势度的变化发生显著改变。例如，胸高断面积和腐生真菌多度随ECM树种优势度上升而增加，而叶片氮含量及β-葡萄糖苷酶、纤维素酶、β-N-乙酰氨基葡糖苷酶等与土壤碳氮相关的酶活性则减弱。结构方程模型进一步显示，ECM树种优势度主要通过调控森林地上属性对SOC产生负影响，其对土壤氮及其转化速率的影响依赖于森林地上和地下属性，表明ECM树种优势度对土壤碳和氮的影响路径存在明显差异。因此，ECM树种优势度可通过调控森林地上和地下属性对土壤碳氮造成不同影响。在全球变化背景下，为科学预测温带森林对ECM树种优势度持续下降的响应模式，需综合考虑森林地上与地下属性的协同变化。

关键词: 外生菌根树种(ECM), 酶活性, 森林群落结构, 矿化作用, 土壤微生物群落, 土壤有机碳

Abstract: Due to global change, the dominance of ectomycorrhizal (ECM) tree species is continually decreasing in temperate forests, which is expected to greatly alter soil carbon and nitrogen dynamics. However, the specific mechanisms through which ECM tree dominance affects soil carbon and nitrogen, particularly via regulating above- and belowground forest properties, remain poorly understood. Here, we investigated the relationships of forest above- (e.g., tree species richness and basal area, leaf nutrient content) and belowground properties (e.g., soil microbial community, enzymatic activity) with soil organic carbon (SOC) and nitrogen along an ECM tree dominance gradient in a temperate forest. We found significant changes in above- (i.e., leaf nutrient content, basal area) and belowground (i.e., fungal community, enzymatic activity) forest properties along the ECM tree dominance gradient. For instance, tree basal area and saprotroph abundance increased with ECM tree dominance, while leaf nitrogen content and enzymes related to soil carbon or nitrogen (β-1,4-glucosidase, cellobiohydrolase, β-N acetylglucosaminidase) decreased. Notably, structural equation modeling suggested that ECM tree dominance negatively affected SOC through regulating aboveground properties. However, ECM tree dominance affected soil nitrogen content and transformation rates by regulating both above- and belowground properties, highlighting different pathways through which soil nitrogen vs. SOC respond to ECM tree dominance change. Therefore, ECM tree dominance can affect soil carbon and nitrogen by distinctively regulating above- and belowground forest properties, and both above- and belowground changes should be considered when predicting how temperate forests will respond to the global-change-induced decline in ECM tree dominance.

Key words: ectomycorrhizal (ECM) tree species, enzymatic activity, forest community structure, mineralization, soil microbial community, soil organic carbon

. 外生菌根优势度对温带森林土壤碳氮的地上-地下影响机制#br#[J]. Journal of Plant Ecology, DOI: 10.1093/jpe/rtaf143.

Xuemei Wu, Zikun Mao, Weijun Sun, Yue Chen, Shuai Fang, Pengcheng Jiang, Fei Lin, Ji Ye, Mengxu Zhang, Meihui Zhu, Xugao Wang. Above- and belowground effects of ectomycorrhizal dominance on soil carbon and nitrogen in a temperate forest[J]. J Plant Ecol, DOI: 10.1093/jpe/rtaf143.

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