长白山高山冻原土壤呼吸及其影响因子分析

Soil respiration and affecting factors on the alpine tundra of Changbai Mountain.

主要研究了长白山高山冻原土壤呼吸与生物量、凋落物和土壤理化因子的相互关系。运用典范相关分析法(CanonicalCorrelationAnalysis)分析了长白山高山冻原生态系统中影响土壤呼吸的主要理化因子。结果表明,长白山高山冻原4种典型土壤类型的土壤呼吸量依次为泥炭化高山冻原土250·79g·m-2·yr-1、草甸化高山冻原土227·69g·m-2·yr-1、潜育化高山冻原土211·36g·m-2·yr-1和石质化高山冻原土209·42g·m-2·yr-1。土壤呼吸与地下生物量显著相关(R2=0·85,n=15,P<0·05);土壤呼吸与凋落物量的空间变化不完全相同;影响长白山高山冻原土壤呼吸的主要理化因子是C/N、土壤持水量、有机质和总氮。

The relationships between soil respiration and biomass,litterfall,soil properties were investigated in the alpine tundra of Changbai Mountain.The results showed that the soil respirations of peat alpine tundra soil,meadow alpine tundra soil,gley alpine tundra soil and lithic alpine tundra soil were 250.79,227.69,211.36 and 209.42 g·m -2·yr -1 respectively.The underground biomass and soil respiration was significantly correlated (R2=0.85,n=15,P<0.05).The spatial pattern of soil respiration and litterfall was not all the same for different vegetation types.The soil respiration was single-peaked for different vegetation types while litterfall was double-peaked.The main factors affecting soil respiration on the alpine tundra of Changbai Mountain was C/N,soil water capacity,soil organic matter,and total nitrogen,according to Canonical Correlation Analysis.