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頁籤選單縮合
題名 | 關渡自然保留區1986-1998年植群變遷=Vegetation Changes at the Kuantu Nature Reserve during 1986-1998 |
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作者 | 李建堂; 鄭育斌; 邱文良; 林則桐; 陳建文; 王儀臻; | 書刊名 | 臺灣林業科學 |
卷期 | 17:1 2002.03[民91.03] |
頁次 | 頁41-50 |
分類號 | 436.12 |
關鍵詞 | 關渡自然保留區; 水筆仔; 堆積速率; Kuantu nature reserve; Kandelia; Accretion rate; |
語文 | 中文(Chinese) |
中文摘要 | 本研究利用系統調查關渡自然保留區於1998年的植物社會。全區共設置16條南北向樣線,紀錄一樣線的植物組成及相對覆蓋度,並沿樣線每隔20m取2×2m的小樣區,紀錄植物組成、覆蓋度、水筆仔數量及胸高直徑。同時沿各樣線每10m紀錄所在的生育地類型,並量測高程。調查結果用來和1986年的結果比較,以瞭解關渡自然保留區植物社會在1986-1998年間的變遷情形,並推估研究區的平均堆積速率。研究結果顯示,在1986年以單葉鹹、蘆葦和水筆仔為優勢植物社會的草澤地,已轉變成以水筆仔和蘆葦為優勢的林澤。水筆仔、蘆葦和裸露地的樣線覆蓋度分別為61.3、25.5和13.2%,而單葉鹹草則已完全消失,水筆仔的相對覆蓋度約佔1998年植群總面積的70.6%。樣區調查得到水筆仔的總株數為3666株,其中樹木與苗木數量的比例約為1:3.8,而其胸徑分布與1986年時相同,皆呈反J型,顯示其更新良好,仍具有擴展的空間。植物社會的海拔高程量測結果顯示,水筆仔和蘆葦的海拔分布幅度分別在0.2-1.3m和0.3-1.6m之間,而裸地高程則在1.2m以下。蘆葦生育地的海拔高程分布高於水筆仔,且兩者之間呈顯著的差異(α=0.05),與1986年的結果相同。在1986-1998年間,究區每年的平均堆積速率約2.0cm。 |
英文摘要 | A systematic survey was used to investigate the vegetation structure of the Kuantu Nature Reserve, northern Taiwan in 1998. In totals 16 transects were carried out in the study area to investigate vegetation types and relative coverage. Meanwhile, along with each transect, a 2×2-m quadrat was sampled with 20-m intervals to record vegetation type, coverage, numbers of Kandelia, and the diameter of Kandelia at breast height. Additionally, field elevation surveys were conducted along with each transect at 10-m intervals. The results were used to compare with findings from 1986 in order to understand how the vegetation has changed during 1986-1998 and to estimate the accretion rate in the study area. The results revealed that the marsh habitat in 1986, dominated by Cyperus, Phragmites, and Kandelia, had changed into Phragmites, and bare land were 61.3, 25.5, and 13.2%, respectively, and Cyperus had disappeared. Relative coverage of Kandelia in the study area was approximately 70.6% of the total vegetation area. The total number of Kandelia was 3666, of which the ratio of samplings and trees to seedlings was about 1:3.8. The size-class distribution of the Kandelia population showed a reversed J-shape which is similar to the results from 1986. The elevation range for Kandelia and Phragmites was 0.2-1.3 and 0.3-1.6m, respectively. Elevation of bare land was below 1.2m. The elevation range of Kandelia significantly differented from that of the Phragmites (α=0.05), a result similar to that from 1986. On average, the accretion rate in the study area during 1986-1998 was about 2.0cm/yr. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。