Soil respiration dynamics for different land-use types on the shoreline of Dongting Lake
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摘要: 土壤呼吸受到多种生物和非生物因素的影响,基于洞庭湖区滩地3种不同土地利用方式和不同时间尺度,分析土壤呼吸动态变化及与环境影响因子的关系,有助于深入了解滩地土壤呼吸变化的机理及精确推算碳的排放。采用LI-8100气体分析仪对洞庭湖区滩地芦苇地、农田、杨树林地土壤呼吸动态进行野外测定,分析不同土地利用类型土壤呼吸速率的日变化和季节变化,并对土壤呼吸速率与近地表温度、0~5 cm土壤含水量、0~5 cm土壤温度、空气湿度等环境因子之间的关系进行相关性分析。结果表明:3种土地利用类型土壤呼吸速率的季节和日变化比较明显,其动态均表现为单峰型,高峰值出现时间存在差异,而最低值大致出现在凌晨5 : 00;不同土地利用类型土壤呼吸作用强弱表现为芦苇地杨树林地农田;3种土地利用类型土壤呼吸速率均与近地表温度、0~5 cm土壤含水量、0~5 cm土壤温度极显著相关(P0.01);杨树林地土壤呼吸速率与空气湿度呈极显著相关。总之,土壤呼吸主要受到温度和0 ~ 5 cm土壤含水量的协同作用。图2表3参11Abstract: A variety of biotic and abiotic factors influence soil respiration. To contribute to a further understanding of soil respiration dynamics and to help provide an accurate calculation of carbon emissions,the relationship between soil respiration dynamics and environmental factors for three land-use types:reeds,farmland,and poplar forest,along the shoreline of Dongting Lake was field tested using an LI-8100 gas analyzer and analyzed for diurnal and seasonal changes in the soil respiration rate. A correlation analysis of the soil respiration rate among factors of near-surface temperature,0-5 cm soil moisture,0-5 cm soil temperature,and air humidity was conducted. Results showed that the dynamic performance of seasonal and diurnal changes in soil respiration were all single-peaked. Peak value times differed with the lowest value occurring about 5:00 A.M. Soil respiration intensity for land-use type was in the order:reeds poplars farmland with soil respiration rate exemely significantly correlated to near-surface temperature (P0.01),0-5 cm soil moisture (P0.01),and 0-5 cm soil temperature(P0.01). Moreover,there was highly significant correlation between popular forest and air humidity. In total,soil respiration was synergied by soil temperature and 0-5 cm soil moisture(P0.05).[Ch,2 fig. 3 tab. 11 ref.]
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Key words:
- soil science /
- shoreline /
- soil respiration /
- diurnal changes /
- seasonal change /
- soil temperature /
- soil moisture
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2011.03.014
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