摘要
[目的]研究不同起源时间的亚热带主要树种凋落物的分解过程。[方法]选择9种起源时间不同的植物的凋落物,采用分解袋法,在南亚热带的鼎湖山地区进行分解实验,实验时间为840 d,研究进化过程中凋落物的干重剩余率和碳素动态变化规律。[结果]凋落物分解系数k值的范围在0.14～0.71间。凋落物分解95%所需时间集中在4.22～21.40 a,50%分解时间集中在0.98～4.95 a。单子叶植物、裸子植物和蕨类植物两两之间分解速率均具有显著差异(P<0.05),但双子叶植物与单子叶植物和裸子植物分解速率之间显著性差异不明显,仅与蕨类植物的分解速率具有显著差异(P<0.05)。凋落物总碳量的总体变化趋势表现为下降,在分解过程中均出现2次不同程度的升高过程,出现时间集中在分解的第240天和660天,此时正值冬季,凋落物分解较慢,碳元素出现积累。双子叶植物、裸子植物和蕨类植物两两之间都具有显著差异(P<0.05),而单子叶植物仅与蕨类植物之间具有显著差异(P<0.05),与双子叶植物和裸子植物之间差异均不显著。[结论]凋落物分解系数K值大小表现为毛竹>青冈>木荷>马尾松>杉木>水杉>苏铁>桫椤>铁芒萁;4个植物类群的凋落物分解速率均值为单子叶植物>双子叶植物>裸子植物>蕨类植物;不同起源时间的植物类群的碳损失量大小顺序为双子叶植物>单子叶植物>裸子植物>蕨类植物。
[ Objective ] Study the leaf litter decomposition of main plants with different origin time in the south subtropical Chinese. [ Method ] Leaf litter decomposition of 9 species with different origin time was studied in the Dinghushan region, using linerhag method, the time was 840 days, to study the variation of litter dry weight remaining and carbon dynamics in evolutionary process. [ Result] The range of the annual litter decomposition coefficient（k） was 0. 14 to 0. 71. The 95% decomposition time ranged from 4.22 to 21.40 a, and the 50% decomposition time ranged from 0.98 to 4.95 a. The difference of litter decomposition rate with monocotyledon, gymnosperm, pteridophyte was significant（ P 〈 0. 05）. But the difference of dicotyledon with monocotyledon, gymnosperm was not significant, with pteridophyte was significant（ P 〈 0.05 ）. The trend of the total carbon was declining, and appeared two different rise process in the decomposition. The time appeared at the 240 d and the 660 d, litter decomposition was slow in winter, the carbon began to accumulate. The difference of carbon loss with dicotyledon, gymno- sperm, pterldophyte was signifieant（P 〈 O. 05 ）. The difference of carbon loss between monocotyledon and ptefidophyte was significant（ P 〈 0.05 ）. [ Conclusion] The trend of the annual liner decomposition eoffieient was P. heterocyela 〉 C. glauea 〉 S. superba 〉 P. massoniana 〉 C. lanceolata 〉 M. glyptostroboides 〉 C. revoluta 〉 A. spinulosa 〉 D. diehotoma. The mean litter decomposition rate of the 4 taxa was mono- cotyledon 〉 dicotyledon 〉 gymnosperm 〉 pteridophyte. The carbon loss of the 4 taxa was dicotyledon 〉 monocotyledon 〉 gymnosperm 〉 pteri- dophyte.
出处
《安徽农业科学》
CAS
2012年第24期12054-12058,共5页
Journal of Anhui Agricultural Sciences
基金
科技部数据共享平台建设项目(2006DKA32300-08)
科技部重大国际合作项目(2008DFA318103819)
科技部重大基础性项目(2007FY110300-08)
浙江省重大科技专项(2008C13042)
浙江省自然科学基金(Y1090603)
浙江省公益技术应用研究农业项目(2011C22022)
关键词
起源时间
凋落物
分解
碳循环
南亚热带
Origin time
Litter
Decomposition
Carbon cycle
South subtropical
