2004-08-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/694367摘要：南仁山森林生態系位於墾丁國家公園南仁山保護區內，屬於亞熱帶過渡至熱帶的雨林，為台灣僅存的低海拔原始森林。南仁山區每年10月至翌年3月盛行東北季風，以往研究指出本區的動物相、植物相及土壤性質等均有很大的變化，孫義方等人(1996)曾提出「東北季風對南仁山森林影響模式假說」加以解釋，然而這些變化是否由東北季風所造成，尚缺乏足夠資料加以證實。該假說認為東北季風造成土壤有效性氮低、礦化速率較低，本研究將以三年期計畫進行驗證。 第一年(92年度)擬分別於受季風影響(古湖迎風區)與未受季風影響(古湖人工擋風區、溪谷樣帶之頂坡)之區域內，分析凋落物之全碳及全氮量、微生物生質碳氮及土壤碳氮礦化量，以驗證「東北季風對凋落物及土壤碳氮礦化作用會造成影響」之假設。另一方面，土壤中礦化出之碳、氮量受凋落物性質影響，而凋落物性質則與樹種組成密切相關，由於不同研究區域之樹種組成不同，因此藉由古湖人工擋風區及溪谷樣帶頂坡之比較，可探討不同樹種組成(凋落物性質不同)對土壤碳氮礦化作用造成之差異，以釐清東北季風對土壤碳氮礦化作用之影響程度。據以往研究指出地形因子會影響土壤性質及礦化作用，因此第二年(93年度)除了延續<br> Abstract: Nanjenshan forest ecosystem, a typical subtropical to tropical rain forest system, is located at the Nanjenshan Natural Reserve Region of Kengting National Park in southern Taiwan, and is only a lower elevation natural forest in Taiwan. Strongly northeastern monsoon always occurred in this region from October to March and it significantly affects the distribution of animal species, vegetation types, and soil properties in this region. Dr. Sun and his colleague have proposed a model to show the effect of northeastern monsoon on the forest ecosystem since 1996. Until now, we have no enough data to completely support or validate the hypothesis of this model. The objectives of this three-year project are to validate the effects of northeastern monsoon on soil available N and mineralization rate of C and N in soils. The first year project (2003) is to compare the total C and N content of litter fall, microbial biomass C and N, and soil mineralization C and N rate under northeastern monsoon affecting region and non-northeastern monsoon affecting region. These results can be used to validate the effects of northeastern monsoon on the C and N mineralization of litter fall and soils. Soil mineralization C and N rates are significantly affected by the composition of litter fall and vegetation types in this site. We design an experiment to test the effects of different vegetation compositions on the soil C and N mineralization and also to identify the net effects of northeastern monsoon on the soil C and N mineralization in this system. The topography can significantly affect on the soil properties and the distribution of water content and soil nutrients based on the previous studies in this region. Therefore, we include another topographic factor to identify the net effect of topography on the soil C and N mineralization in the second year project (2004) under northeastern monsoon condition. The third year project (2005) will focus on the collection and analyses of soil solution, which are leached from soil solum and finally to calculate and evaluate the net soil nutrient budgets of this forest ecosystem based on the previous research data and combined data getting from this research.東北季風碳氮礦化作用凋落物樹種組成地形土壤溶液養分收支Northeastern monsoonC and N mineralizationLitter fallVegetation typesTopographySoil solutionNutrient budget