Characteristics of Soil Respiration in Broad-leaved Evergreen Forest and Phyllostachys edulis Plantations in the Lijiang River Source Area
[Objective]The soil respiration characteristics of broad-leaved evergreen forest and moso bamboo forest in the source area of the Lijiang River was studied to provide scientific basis for the estimation and management of soil carbon emissions in the region.[Method]Using the Li-8100A soil carbon flux measurement system to monitor the soil respiration rate of broad-leaved evergreen forest,moso bamboo forest,and nurtured and transformed moso bamboo plantations(Phyllostachys edulis-Polygonatum cyrtonema,P.sedulis-Sarcandra glabra)in the source area of Lijiang River from December 2022 to November 2023.[Result]1)The Characterization of annual changes in total soil respiration of broad-leaved evergreen forest,moso bamboo forest and nurtured and transformed moso bamboo plantations showed an overall single-peak curve with an increasing and then a decreasing rate.2)The annual average of total soil respiration in broad-leaved evergreen forest(4.18±2.01 μmol·m-2·s-1)was significantly higher than that of moso bamboo forest(2.36±1.18 μmol·m-2·s-1)and moso bamboo plantations after nurtured and transformation(2.41±1.09 and 2.54±1.18 μmol·m-2·s-1),which were 1.77,1.73 and 1.65 times higher than that of moso bamboo forest and moso bamboo plantations after nurtured and transformation,respectively.After nurtured and transformation the moso bamboo forest and intercropping S.glabra and P.cyrtonema,the annual average of total soil respiration was increased,and the annual average of total soil respiration of intercropping S.glabra was lower than that of intercropping P.cyrtonema.3)Soil temperature and soil moisture are the main factors influencing soil respiration rates,the degree of explanation for total soil respiration changes in broad-leaved evergreen forest,moso bamboo forest and nurtured and transformed moso bamboo plantations ranges from 63.5% to 86.1%[Conclusion]The total soil respiration of the broad-leaved evergreen forest in the source area of the Lijiang River is significantly higher than that of the moso bamboo forest and the moso bamboo plantations after nurtured and transformation.The total soil respiration of moso bamboo plantations is increased after nurtured and transforming and intercropping S.glabra and P.cyrtonema.Soil temperature and soil moisture are the main factors influencing the soil respiration and its components.
Lijiang River source areasoil respirationbroad-leaved evergreen forestmoso bomboo plantations
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