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題 名 | Nitrogen Deposition in Three Stands of Guandaushi Forest Ecosystem=關刀溪森林生態系三種林分氮的沉降 |
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作 者 | 劉瓊霦; 許博行; | 書刊名 | 林業研究季刊 |
卷 期 | 23:1 2001.03[民90.03] |
頁 次 | 頁13-24 |
分類號 | 436.12 |
關鍵詞 | 氮沉降; 雨水; 穿落水; 幹流水; 杉木林; 次生林; 天然林; N deposition; Precipitation; Throughfall; Stemflow; China-fir plantation; Secondary hardwood; Natural hardwood; |
語 文 | 英文(English) |
中文摘要 | 本試驗在臺灣中部關刀溪試驗集水區相鄰的杉木林、次生林及天然林三種不同林分內,評估雨水流經此三種不同林分後,在穿落水及幹流水的不同型態的N沉降及季節變化(1996年1月到1998年12月)。雨水的總氮年平均沉降為12.30 kg ha¯ ¹yr¯ ¹,穿落水的總氮年平均沉降在杉木林、次生林及天然林則分別為20.94 kg ha¯ ¹yr¯ ¹, 21.19kg ha¯ ¹yr¯ ¹, 和19.24 kg ha¯ ¹yr¯ ¹,幹流水則分別為3.89 kg ha¯ ¹yr¯ ¹, 1.23 kg ha¯ ¹yr¯ ¹, 及0.69 kg ha¯ ¹yr¯ ¹。有機氮在杉木林穿落水及幹流水都有較高比例的沉降,NO₃-N在天然林穿落水的沉降較杉木林和次生林低。不同型態N沉降的季節變化顯示,在冬天乾季時,其沉降量特別高,此證明乾沉降對此森林生態系氮沉降的重要性。淨沉降在杉木林、次生林及天然林則分別為12.53 kg ha¯ ¹yr¯ ¹, 10.13 kg ha¯ ¹yr¯ ¹, 和7.63 kg ha¯ ¹yr¯ ¹。 |
英文摘要 | A study was undertaken in 3 types of forest stands, a China-fir (Cunninghamia lanceolata) plantation, a secondary hardwood stand, and a natural hardwood stand in Guandaushi Forest, central Taiwan, from January 1996 to December 1998. We assessed the effect of different stands on the form, quantity and seasonal variation of N deposition through precipitation, throughfall and stemflow. The total N deposition by precipitation was 12.30 kg ha¯ ¹yr¯ ¹, and that by throughfall was 20.94 kg ha¯ ¹yr¯ ¹, 21.19 kg ha¯ ¹yr¯ ¹, and 19.24 kg ha¯ ¹yr¯ ¹ in a China-fir plantation, a secondary hardwood, and a natural hardwood, respectively. The quantities of total N deposited through stemflow in the three stands were 3.89 kg ha¯ ¹yr¯ ¹, 1.23 kg ha¯ ¹yr¯ ¹, and 0.69 kg ha¯ ¹yr¯ ¹, respectively. The gross N deposition via throughfall and stemflow was 20.94 and 3.89 kg ha¯ ¹yr¯ ¹, respectively. The organic-N contributed the maximum deposition of the gross N deposition via throughfall and stemflow in the China-fir plantation. At the natural hardwood stand, had lower NO₃-N deposition than the other two stands. The monthly concentrations of NH₄-N , NO₃-N, organic-N and total N revealed that maximum concentration occurred in winter, when the months were the driest. It suggested a significant contribution of dry N deposits into the Guandaushi forest ecosystem. The annual net N depositions were 12.53 kg ha¯ ¹yr¯ ¹, 10.13 kg ha¯ ¹yr¯ ¹, and 7.63 kg ha¯ ¹yr¯ ¹ at the China-fir plantation, the secondary hardwood, and the natural hardwood, respectively. |
本系統中英文摘要資訊取自各篇刊載內容。