摘要
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.
Taking the mixed leaf litters in broadleaved-Korean pine forests at different succession stages（secondary birch forest,selective cutting forest,and original mixed forest） and the leaf litters of the dominant tree species（Betula costata,Tilia amurensis,and Pinus koraiensis） in these forests in Xiaoxing＇an Mountains,China as test objects,this paper studied their remaining rates and nutrient dynamics in October 2006-November 2008 by using decomposition bag method.For all test leaf litters,their remaining rate had an exponential relationship with time.The annual decomposition constant（k） ranged from 0.137 to 0.328,and the time for decomposing 50%（t50%） and 95%（t95%） was 2.340-4.989 years and 9.360-21.796 years,respectively.No significant differences were observed in the decomposition rates of the leaf litters among the forests,but the k value of the mixed leaf litters was decreased in the order of original mixed forest selective cutting forest secondary birch forest,while that of the dominant tree species leaf litters had no obvious pattern.During decomposition,the elements C,P,and K in leaf litters released continuously,and the release pattern of C followed linear function,while that of P and K followed a function of higher degree.Element N presented different levels of accumulation,but had no clear pattern.
出处
《应用生态学报》
CAS
CSCD
北大核心
2010年第9期2209-2216,共8页
Chinese Journal of Applied Ecology
基金
国家"十一五"林业科技支撑计划项目(2006BAD03A0702)
林业公益性行业科研专项经费(200704005
200804001)资助
关键词
阔叶红松林
演替阶段
凋落叶
分解速率
养分特性
mixed broadleaved-Korean pine forest
succession stage
leaf litter
decomposition rate
nutrient characteristic.
