臺灣博碩士論文加值系統

Litter decomposition is an ecological process associated with carbon and nutrient cycling in forest ecosystems. Litter quality is the main influencing factor in determining the rate of decomposition (k), which differs with tree species. Understanding the mechanisms and drivers that control the decomposition process may improve forecasts of global carbon cycle and ecosystem dynamics under conditions of climate change in the future. The purpose of this study is to measure the k value of leaf litter from six dominant tree species, Autumn Maple (Bischofia javanica), Camphor (Cinnamomum camphora), Himalayan Ash (Fraxinus griffithii), Golden Rain Tree (Koelreuteria henryi), Formosan Sweet Gum (Liquidambar formosana), and Zelkova (Zelkova serrata), in a subtropical forest in Taiwan using a litterbag technique. Canopy openness (CO), leaf area index (LAI), and specific leaf area (SLA) describe the characteristics of individual stands. The hemisphere photography assessed seasonal change in a canopy. The results show that CO is conversely correlated with LAI in all tree species and seasons. The mean of the seasonal change of individual CO increased from 23.43 to 70.08, while LAI decreased from 1.77 to 0.33 from December 2015 to November 2016. There was low correlation between SLA and the decomposition rate among tree species. Only the Himalayan Ash and Golden Rain Tree had similar k values and a similar SLA. After 372 days of field incubation from July 2015 to June 2016, the decomposition rate of the leaf litter was 1.22, 1.30, 0.76, 0.88, 1.11, and 0.56 yr-1, for Autumn Maple, Camphor, Himalayan Ash, Golden Rain Tree, Formosan Sweet Gum, and Zelkova, respectively. The rates of decomposition in this study are in the normal range of the k value of the subtropical tree species. Leaf litter chemical concentrations varied by species, time, levels for C/N ratio, P, S, K, Ca, and Na. The results confirm a strong relationship between C/N and litter decomposition rate.

Acknowledgements i
Abstract ii
Table of Contents iii
List of Tables iv
List of Figures v
1. Introduction 1
2. Materials and Methods 9
3. Results 21
4. Discussion 35
5. Conclusion 49
6. References 51
7. Appendix 63

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