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OALib Journal期刊
ISSN: 2333-9721
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江西大岗山毛竹林土壤呼吸时空变异及模型模拟
DOI: 10.3969/j.jssn.1000-2006.2010.06.011, PP. 47-52
Keywords: 毛竹林,海拔,土壤呼吸,土壤温度,土壤含水率,模型
Abstract:
采用li8100土壤呼吸测定仪对江西大岗山地区不同海拔毛竹林土壤呼吸的时空格局变化进行了测定，同时建立了多种基于土壤温度、含水率及水热因子的土壤呼吸模型。结果表明：毛竹林土壤呼吸随海拔升高而降低，其日变化与不同深度土壤温度变化趋势基本一致，呈单峰曲线变化。土壤呼吸与地表面、地下10、20和30cm处土壤温度显著相关(p<0.1)，其中与地下10cm处温度相关性达到极显著水平(p<0.05)，相比van’thoff模型，lloyd、taylor模型的拟合度r2更大；线性模型表明土壤呼吸与不同层土壤含水率相关性较小(r2=0.133~0.377)，将实测土壤呼吸标准化为10℃时的土壤呼吸r10后，r10与土壤含水率相关性显著增强(r2=0.303~0.445)；土壤水热双因子模型能进一步提高土壤呼吸模型预测能力(r2=0.450~0.768)。
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