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2006年10月—2008年11月,以小兴安岭地区典型阔叶红松林不同演替阶段[白桦次生林、择伐后的阔叶红松林(简称择伐林)、原始阔叶红松林]的混合凋落叶以及阔叶红松林优势树种(枫桦、紫椴和红松)的凋落叶为对象,采用网袋分解法分析阔叶红松林演替阶段中凋落叶的残留率和养分元素的动态变化.结果表明:各种凋落叶的残留率与时间均呈指数关系,凋落叶年分解系数(k)在0.137～0.328,其分解50%和95%的时间分别在2.340～4.989 a和9.360～21.796 a;不同演替阶段凋落叶的k值差异不显著,其中混合凋落叶k值的大小顺序为阔叶红松林>择伐林>白桦林,而其他凋落叶没有表现出明显的规律;在凋落叶分解过程中,C、P和K不断释放,且形式有所差异,其中C为线性衰减模式,P和K为一元多次方程模式;N虽有不同程度的积累,但无明显规律性.
From October 2006 to November 2008, the mixed litter of typical Korean pine broad-leaved Korean pine forests in different succession stages [secondary birch forest, broad-leaved Korean pine forest after selective cutting (selective cutting forest) and Korean pine broad-leaved forest] The leaf litter and the deciduous leaves of the dominant species of broad-leaved Korean pine forest (Betula platyphylla, Tilia amurensis and Korean pine) were used to analyze the dynamic changes of litter leaf litter and nutrient elements in the succession stage of Korean pine forest. The results showed that the litter leaf litter retention rate was exponential with the time. The litter decomposition coefficient (k) ranged from 0.137 to 0.328, and the decomposition times of 50% and 95% were 2.340 ~ 4.989 a and 9.360 ~ 21.796 a The k value of leaf litter in different succession stages was not significantly different. The order of k value of mixed litter leaf was broad-leaved Korean pine forest> selective-cut forest> birch forest, while other litter leaves did not show obvious laws. In the process of decomposition, C, P and K are continuously released and have different forms, of which C is a linear decay mode and P and K are unary multiple equation models. Although N accumulates to some extent, it has no obvious regularity.