森林河岸带湿地是林区的重要组成部分，其甲烷(CH4)排放是大气CH4的重要来源，在调节大气CH4浓度方面具有重要意义。然而，已有的森林CH4通量观测更加关注森林高地的CH4通量特征，并且多集中在生长季，有关森林湿地CH4通量随关键时期（特别是非生长季节）的变化及其驱动机制尚不清楚。为此，本项目拟以亚高山森林为研究对象，采用野外测定和室内分析相结合的方法，对比研究山坡林地和典型河岸湿地CH4通量、产CH4潜势和CH4氧化潜势、CH4过程相关的微生物功能基因丰度和群落组成随关键时期（雪被融化期、生长季中期、雪被初期、雪被覆盖期）的变化规律。同时，基于结构方程模型综合分析环境、底物和微生物因子对CH4通量的调控途径。本项目的实施有望揭示森林湿地CH4通量对亚高山林区CH4通量的贡献，解析森林湿地CH4通量动态变化的驱动机制，为亚高山森林湿地管理提供科学依据。

Riparian wetland is an important component of forest zone, and its methane (CH4) emission is an important source of atmospheric CH4, which plays an important role in regulating atmospheric CH4 concentration. However, previous studies about forest CH4 fluxes mainly focused on forest upland and also on the growing season, while the change of CH4 flux with critical period (especially non-growing season) in forest wetland and its driving mechanism are still unclear. Here, in this project, take we tried to examine change of CH4 flux, CH4 production and oxidation potential, abundance and community composition of microbe related to CH4 process with the critical period (snow melting period, middle growing season, early snow cover, and snow cover period) in forest upland and typical riparian wetland through field measurements and indoor analysis in a subalpine forest. Moreover, we will use structural equation modeling (SEM) to gain a mechanistic understanding of how the environmental, substrate and microbial factors affect CH4 flux. This project could reveal the contribution of CH4 flux in forest wetland to subalpine forest areas, and explore the driving mechanism of CH4 flux dynamic change in forest wetland, so as to provide scientific basis for subalpine forest wetland management.