摘要
2005年在北京市延庆县营盘村附近中山采用网袋法,比较21、29、36年生油松叶凋落物分解动态、分解速率、基质质量的差异。结果表明:在所观测的14个月内,不同林龄油松叶凋落物分解动态差异较小,均呈快—慢—快的规律,翌年5至7月份凋落物分解速率低于2005年同期的分解速率。21 a、29 a、36 a油松叶凋落物分解速率分别为26.97%、26.10%和23.96%,半分解周期分别为2.21 a、2.29 a和2.54 a,周转期分别为9.54 a、9.91 a和10.94 a。凋落物分解速率、半周转期、周转期失重率仅在0.1水平上差异显著。林龄对叶凋落物N影响最大(P=0.004),对粗灰分(P=0.028)影响显著。林龄对纤维素、木质素、粗脂肪、粗蛋白影响不显著。不同林龄叶凋落物C/N(P=0.009)、木质素/N(P=0.048)显著差异,C/N、木质素/N与叶凋落物分解速率相关系数均为-0.333。
Decomposition characteristics such as decomposition dynamics, decomposition rate and leaf substrate quality affected by forest age were manipulated by mesh bags in 21-, 29- and 36-year-old Pinus tabulaeformis stands in the middle hilly lands of Yingpan, Yanqing Country of Bejing in 2005. The results showed that the minimum discrepancy was in the decomposition dynamics, indicating that the decomposition rate exhibited rapid-slow-rapid trend in all three stands with different ages and the decomposing rate was slower during the period from May to July in 2006 than that in 2005. The decomposition rate of the leaf litter was 26. 97%, 26. 10% and 23.96%, respectively. The half-turnover and turnover among the three stands were 2.21, 2.29 and 2. 54 years as well as 9.54, 9.91 and 10.94 years, respectively. However, the importance of the decomposition rate, haff-turnover and turnover in the forests was not significant but at 0.1 level. The N content of the leaf litter was the most affected by age （ P = 0. 004） , followed by the crude ash （ P = 0.028 ）. The contents of cellulose, lignin, coarse fat and coarse protein were not significant at the 0.1 level. Although the ratios of both C/N and lignin/N in the leaf litter were affected by forest age markedly, the relation coefficients of the both ratio and decomposition rate were - 0. 333.
出处
《林业科学研究》
CSCD
北大核心
2008年第4期500-505,共6页
Forest Research
基金
国家自然科学基金(30471380)
北京市教委项目资助(JD100220648)
关键词
油松
人工林
林龄
分解速率
基质质量
Pinus tabulaeformis
plantation
forest age
decomposing rate
substrate quality
