生态学报2024，Vol.44Issue(10)：4319-4333,15.DOI:10.20103/j.stxb.202303220553
根系对寒温带冻土区兴安落叶松林土壤碳通量的影响
Effects of roots on soil carbon fluxes in Larix gmelinii forests of the cool-temperate tundra zone
摘要
Abstract
Soil carbon fluxes are an important component of the carbon cycle in forest ecosystems.Roots play a key role in soil carbon fluxes.The study of root effects on soil carbon fluxes is important for studying greenhouse gases in the cold-temperate tundra.We selected Ledum palustre-Larix gmelinii(DXL),Rhododendron dauricum-Larix gmelinii(DJL),and Sphagnum-Bryum-Ledum palustre-Larix gmelinii(TXL)forests as research object.Further,the roots were broken off by the trench method.Finally,the soils carbon fluxes were measured and analyzed using the portable soil respirometer G4301 for daily and monthly dynamics.Results show that soil CH4 uptake of DXL and DJL was inhibited by root-break treatments from June to November,with decrease by 15.16％—54.31％and 11.26％—33.84％,respectively.It contributed to the soil CH4 emission of the TXL,with increase by 19.22％—75.52％.It suppressed soil CO2 emissions from 3 types of Larix gmelinii forests by 32.29％—87.62％.The effect of root breakage on soil CH4 in DXL and TXL was the most significant in August with increases of-54.31％and 75.52％,respectively.In DJL,the impact was the most significant in November,with a drop of 33.84％.The effect of root breakage on soil CO2 emission of the 3 types of Larix gmelinii forests reached the significant degree from June to November.Among them,it was the most significant in November,with the reduction ranging from 54.94％—to 87.62％.Differences in the effects of root breakage on the daily dynamics of soil CH4 fluxes in the 3 types of Larix gmelinii forests were not significant.However,the effect on soil CO2 flux was significant.The most significant effects were observed from 14:00——18:00,with decreases ranging from 31.87％—to 62.26％.Soil and air temperatures were main factors that roots influenced changes in soil carbon fluxes.Treatment of root breaks enhanced the effect of soil temperature on daily and monthly changes in soil carbon fluxes.It also attenuated the effect of air temperature on the daily dynamics.It suggests that soil carbon fluxes from root autotrophy may be more active in daily dynamics and more stable in monthly dynamics.关键词
CH4通量/CO2通量/日动态/月动态/断根处理Key words
CH4 fluxes/CO2 fluxes/daily dynamics/monthly dynamics/root-excision treatment引用本文复制引用
李海兴,满秀玲,高明磊..根系对寒温带冻土区兴安落叶松林土壤碳通量的影响[J].生态学报,2024,44(10):4319-4333,15.基金项目
国家重点研发计划资助项目(2021YFD2200405) （2021YFD2200405）
