人為干擾對南仁山生態保護區地景之影響

Human Disturbances on Landscape in Nanjenshan Reserve Area

本研究以南仁山生態保護區為範圍，探討地景排列與變遷。利用1976、1989、1997年之航空照片為材料，以立體鏡判釋出21種土地利用類型，並轉繪成1:5000之土地利用型圖，為利於地景參數之計算，本研究以地理資訊系統進行土地利用型圖數化，並分析各項地景指標包括Shannon多樣性、最大多樣性及均勻度指標。不同時期及不同干擾狀況之地景指標，以t值檢定其間之差異，結果顯示三期土地利用及不同干擾狀況對地景多樣性及地景組成皆有顯著的影響，1976年具有較高的地景多樣性，而至1997年其地景多樣性有下降之趨勢，其下降程度干擾區大於天然地區。 Landscape pattern and dynamic changes were studied in Nanjenshan Reserve Area. Land use maps of three representative years (1976, 1989 and 1997) with a scale of 1:5000, derived from interpreted aerial photographs, were collected. Using digital instruments with the assistance of a Geographic Information System digitized eleven land use categories. Landscape pattern and dynamics analyses, which were quantified by a series of structural indices including Shannon diversity, maximum diversity, and evenness index. T-value as a rule to test the difference of landscape in different periods and disturbances. The results demonstrated that the landscape diversity and component change significantly during the period 1976, 1989 and 1997. Landscape pattern of 1976 had higher diversity. Up to 1997, the declining trend of diversity has been displayed. From the degree of declining trend, we found that the diversity of disturbed area was larger than the natural area.

Landscape pattern and dynamic changes were studied in Nanjenshan Reserve Area. Land use maps of three representative years (1976, 1989 and 1997) with a scale of 1:5000, derived from interpreted aerial photographs, were collected. Using digital instruments with the assistance of a Geographic Information System digitized eleven land use categories. Landscape pattern and dynamics analyses, which were quantified by a series of structural indices including Shannon diversity, maximum diversity, and evenness index. T-value as a rule to test the difference of landscape in different periods and disturbances. The results demonstrated that the landscape diversity and component change significantly during the period 1976, 1989 and 1997. Landscape pattern of 1976 had higher diversity. Up to 1997, the declining trend of diversity has been displayed. From the degree of declining trend, we found that the diversity of disturbed area was larger than the natural area.