為瞭解疏伐對於土壤溶液中養分含量的影響,並且評估疏伐的效益,本研究於2006/3~2007/3期間在太平山和平事業區第61林班地內,分別在八種疏伐處理樣區 (未疏伐對照組 (0%) × 3、25%、28%、30%、33%、37%、38% 與 53%疏伐度,共計10個樣區)內隨機選取地點利用土鑽分別採取0-10 cm、10-20 cm與20-30 cm 的土壤,抽取土壤溶液測定陰離子(Cl、NO_3、SO_4、PO_4) 及陽離子 (NH_4、K、Na、Ca、Mg、Fe、Al、Mn、Si)含量。本研究主要研究目的為以一年短期而密集的監測,探討不同疏伐度處理下養分在土壤溶液中的變化,藉以評估疏伐的效益,以提供作為未來林業經營的參考。研究結果指出:土壤溶液的化學組成,隨著土壤深度的增加而陽離子的濃度降低,其原因為隨著土壤深度的增加,伴隨著生物因子的影響增加(包括根的吸收及微生物的固定作用),使得陽離子的濃度會漸漸減低,而疏伐所引起的土壤溶液化學組成的改變會因疏伐度不同而有不同。但可確認的是,疏伐作業能改變土壤養分的量及變化,而變化的方向是趨於有利於樹木生長。
In order to recognize the effect of forest thinning on the nutrient contents in soil solution and to evaluate the benefit of forest thinning, eight thinning treatments were examined in this study, including control (0%, 3 plots) and thinning intensity of 25%, 28%, 30%, 33%, 37%, 38% and 53% (one plot for each treatment). The study area was located at the 61 forest compartment of Hoping Working Circle in Taipingshan area. Three soil samples for each experimental plot were also collected monthly by soil auger, including 0-10 cm, 10-20 cm and 20-30 cm. Soil solution was extracted and prepared for measuring anions (Cl, NO_3, SO_4, PO_4) and cations (NH_4, K, Na, Ca, Mg, Fe, Al, Mn, Si). The objectives of this study were to investigate the variation of nutrients of soil solution in one-year shorten and intensive monitoring period and to discuss the benefit of forest thinning for propose the consultation to the forestry management in the future. The results of this study indicated that the cation concentration decreased with the soil depth increased. We examined that the gradually decreased of cation with soil depth was due to the increasing effect of bio-factor (for example, nutrient absorption by roots and microbial fixation, etc.). The effect of forest thinning on the variation of soil solution chemical composition was changed with different thinning intensity. From the results of this study, we concluded that the operations of forest thinning could alter the soil nutrients content, and the changes were beneficial to the growth of remaining trees.
為了持續優化網站功能與使用者體驗,本網站將Cookies分析技術用於網站營運、分析和個人化服務之目的。
若您繼續瀏覽本網站,即表示您同意本網站使用Cookies。