運用茶包比較臺灣濕地土壤有機物分解速率

Comparison of teabag decomposition rates in the soils of wetlands in Taiwan

唐翎沁(Ling-Qin Tang) ； 林巧雯(Chiao-Wen Lin) ； 林幸助(Hsing-Juh Lin)

《濕地學刊》 10卷1期 (2021/12) Pp. 1-12

摘要

為比較不同棲地凋落物分解速率，國際間倡導Teabag Index實驗。本研究利用參與全球Teabag Index實驗的機會，於2017年首次比較臺灣不同類型重要濕地之茶包分解速率，初探全臺濕地凋落物之分解作用，以及影響可能因素。本研究研究地點共八處，包括夢幻湖、挖仔尾、竹圍、高美濕地、芳苑紅樹林、七股紅樹林、南仁湖與大光海草床。依照Teabag Index實驗流程，使用立頓（Lipton）茶包（綠茶：Lipton GreenTea、紅茶：Lipton Rooibos Herbal Infusion），於距離土表10 cm處掩埋茶包，分別於3個月、6個月、1年、2年及3年後回收茶包，清洗烘乾秤重。研究結果顯示綠茶包較紅茶包分解快速，綠茶茶包分解速率與降雨量、濕度呈正相關性，而紅茶茶包分解速率與降雨量呈負相關性。但因實驗流程設計不佳，使得實驗結果解釋能力不高，未來應針對研究地點之環境條件，調整實驗流程及取樣時間。若於溫度及降雨量較高之熱帶及亞熱帶環境，需縮短實驗初期實驗茶包之取回時間。同時因樣區位於野外，易遭遇不可抗力所致之樣本遺失，也應加強樣本固定、保護，或以增加重複方式，降低樣本全部遺失之風險。紅樹林樹種因呼吸根生長，茶包易因此遭受破壞，建議需改善進行紅樹林茶包分解實驗之方法與材料。

關鍵字

茶包指數 ； 凋落物分解速率 ； 臺灣 ； 濕地

並列摘要

Teabag Index Experiment was initiated to compare litter decomposition rates across global ecosystems. In 2017, we used this opportunity to compare the decomposition rates of teabags in a variety of wetlands and explore the potential regulating factors in Taiwan. In total, there were eight study sites, including Menghuan Pond, Waziwei mangroves, Chuwei mangroves, Kaomei Wetland, Fanyuan mangroves, Chiku mangroves, Nenren Lake and Dakwan seagrass meadows. Two types of teabags (Lipton Green Tea and Lipton Rooibos Herbal Infusion) were used for the materials to decompose in the soil depth of 10 cm for each wetland and retrieved the teabags from the soils after the deposition of 3 months, 6 months, one year, two years and 3 years. The results showed that the decomposition rates of green teabags were faster than those of red teabags. The decomposition rates of green teabags correlated positively with precipitation and humidity, whereas the decomposition rates of red teabags correlated negatively with precipitation. However, the explanation capacity of this study was not good enough because of the problem of experimental procedures. In the future, such decomposition experiments need to consider the environmental conditions of study sites. For example, retrieval times should be shortened in the case of warm temperature and humid environments. More replicates should be placed in safe guarding in the field to prevent the total loss of teabags. The experiments in mangroves should prevent the damage of pneumatophores on the deposited teabags.

並列關鍵字

Teabag Index ； litter decomposition rates ； Taiwan ； wetland