太麻里動態樣區之凋落葉直鏈烷化學分析

Chemical analysis of n-alkane of litter-leaf in the Timali Dynamic plot

江照安(ZHAO-AN JIANG)

指導教授 ： 范誠偉

國立中正大學/理學院/地球與環境科學系應用地球物理與環境科學研究所/碩士(2016年)

摘要

本次研究目的主要分析太麻里動態樣區之兩個永久樣區中凋落物樣品及土壤樣品的直鏈烷(n-Alkane)分佈狀況。分析樣品包括凋落物(凋落葉、殘渣、枝條、花、果實)與枯枝落葉層與土壤層，共計138個。樣品以索氏萃取法(Soxhlet Extraction)搭配氣相層析儀火焰離子偵測器(GC-FID)做定性定量的分析。各樣品之總濃度範圍為11 ~ 2779 ug/g，其中以凋落物總濃度714±618 ug/g (n=130)最大，其次為枯枝落葉層454±87 ug/g (n=2)，最小為土壤 32±31 ug/g (n=6)，相較土壤樣品，植物型態的樣品濃度較高。凋落物(n=130)各組成之直鏈烷平均濃度以凋落葉樣品(803±631 ug/g)最高，其次為花(455±80 ug/g)、殘渣(363±130 ug/g)、枝條(143±105 ug/g)及果(101±74 ug/g)濃度相對較低。烏心石樣區與牛樟樣區全實驗期間直鏈烷總通量分別為881μg/m2/d和843μg/m2/d，其中以凋落葉貢獻度(75%)最高，其次為殘渣(12%)、枝條(7%)，花與果實的貢獻度(< 3%)不高。烏心石樣區及牛樟樣區直鏈烷通量組成以C31、C29為主，次優勢為C27、C33。烏心石樣區及牛樟樣區從凋落物至枯枝落葉層到上、中、下層土壤之CPI値依次為8.57及8.55、8.40及6.94、7.29及6.37、6.14及6.31、5.04及5.47。顯示兩樣區OEP現象有逐漸降低之趨勢；烏心石樣區及牛樟樣區從凋落物相對於下層土壤之ACL值分別為29.96及29.83相對29.49及29.43，顯示從有形的葉片狀態進入無形的土壤狀態時甚至到土壤深層時，優勢之直鏈烷C31、C29可能有所減少。未來將分析落葉之分解袋，來掌握直鏈烷從凋落業傳輸至土壤底泥之過程。

關鍵字

直鏈烷 ； 凋落物 ； 太麻里動態樣區

並列摘要

The purpose of this study is to understand the n-alkane distribution of litter-fall and soil samples from the Timali Dynamic plot, including subplot Michelia compressa-plot and Cinnamomum kanehirae-plot, MC-plot and CK-plot, Taitung, Taiwan. Samples are extracted and analyzed by Soxhlet Extraction and GC-FID. The n-alkanes (C14 ~ C35) concentrations of all samples analyzed are ranged from 11 ug/g to 2779 ug/g. The n-alkanes (C14 ~ C35) concentrations of litter-fall are averaged 714±618 ug/g (n=130) and are higher than those of litter-layer of 454±87 ug/g (n=2) and those of soil of 32±31 ug/g (n=6). Among all the litter-fall samples, the highest average n-alkane concentration is 803±631 ug/g of litter-leaf, following by 455±80 ug/g of flowers, 363±130 ug/g of miscellaneous fraction (mostly leaf fragment without identified), 143±105 ug/g of branches, 101±74 ug/g of fruits。The total n-alkanes flux of litter-fall are 881μg/m2/d and 843 μg/m2/d in MC-plot and CK-plot ,which litter-leaf accounts for 75%, miscellaneous fraction 12%, and branches 7%, and flower and fruits accounts for 3% lower。The predominance n-alkane compounds are C31, C29 and following by C27,C33 among the calculated n-alkane litter fluxes in MC-plot and CK-plot. The CPI values from litter-fall, litter-layer to topsoil to deeper soil in MC-plot and CK-plot are 8.57and 8.55, 8.40and 6.94, 7.29 and 6.37, 6.14 and 6.31, 5.04 and 5.47, which indicated that the reduction of OEP phenomenon. The ACL values from litter-fall to deeper soil in MC-plot and CK-plot are 29.96 and 29.83, 29.49 and 29.43, which indicated that the reduction of the predominance n-alkane compounds(C31,C29) from leave to deeper soil. In the future, more analysis study the concentration and distribution of n-alkanes for samples of decompostions will be conducted to understand the transport mechanism of n-alkane from litter-fall to sediments.

並列關鍵字

n-alkane ； litter- fall ； Timali Dynamic Plot

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