CAJ | 학술논문

在中国南亚热带人工林生态系统中，大面积的林下层被密集的蕨类植物芒萁所占据。作为森林土壤最重要的养分来源，很多冠层树种的凋落物在到达地表之前，会被芒萁拦截。通过调查南亚热带4种人工林林下芒萁层对冠层树种叶片的拦截量与拦截比例，发现林下芒萁层对凋落物的拦截量排序为湿地松＞厚荚相思＞尾叶桉＞红椎，而林下芒萁层对尾叶桉叶片的拦截比例最高，达99.8%，其次分别为厚荚相思（73.5%）、湿地松（56.3%）和红椎（27.0%）；所有人工林林下芒萁的下半层（0~50 cm）拦截了更大比例的凋落叶，最大为尾叶桉（64.7%），最小为红椎（23.1%）。林下芒萁层的凋落物拦截效应可能会改变森林生态系统的地上过程和地下过程，进而影响整个森林的碳循环等生态系统功能。通过凋落物拦截实验，开展林下层植物对人工林生态系统碳循环的影响的相关机理研究，有助更好地理解在生态系统水平上林下植被对整个森林生态系统功能的影响。
재중국남아열대인공림생태계통중，대면적적림하층피밀집적궐류식물망기소점거。작위삼림토양최중요적양분래원，흔다관층수충적조락물재도체지표지전，회피망기란절。통과조사남아열대4충인공림림하망기층대관층수충협편적란절량여란절비례，발현림하망기층대조락물적란절량배서위습지송＞후협상사＞미협안＞홍추，이림하망기층대미협안협편적란절비례최고，체99.8%，기차분별위후협상사（73.5%）、습지송（56.3%）화홍추（27.0%）；소유인공림림하망기적하반층（0~50 cm）란절료경대비례적조락협，최대위미협안（64.7%），최소위홍추（23.1%）。림하망기층적조락물란절효응가능회개변삼림생태계통적지상과정화지하과정，진이영향정개삼림적탄순배등생태계통공능。통과조락물란절실험，개전림하층식물대인공림생태계통탄순배적영향적상관궤리연구，유조경호지리해재생태계통수평상림하식피대정개삼림생태계통공능적영향。
China is considered as the largest country with artificial plantations. The plantations are considered as important carbon pool and would influence climate change at regional scale. As a major species for forest restoration, carbon fixation, and economic improvement for farmers, Pinus elliottii, Acacia crassicarpa, Eucalyptus urophylla and Castanopsis hystrix, have been widely planted in South China due to their fast growth and woody characteristics. The understory of these plantations is often occupied by dense fern (Dicranopteris dichotoma). Understory vegetation as transitional layer links ecosystem processes between aboveground and underground. The ecosystem functions of understory vegetation were mostly ignored due to the lower biomass. However, not only they can accumulate biomass per se, but also facilitate carbon fixation in soils. The dense fern intercepts canopy tree leaf litters before they reach the ground in these plantations of South China. Litter is the most important nutrient origin of forest soil. In order to explore the effect of litterfall interception on ecosystem processes and functions about leaf litters, we should first know the basic questions:1) how many leaf litters are intercepted by the fern? and 2) which factors affect the litter interception? We investigated the physical traits of leaf litter and the biomass of Dicranopteris Dichotoma, and conducted an experiment to quantify the mass and proportion of intercepted litters in four kinds of plantation ecosystems in South China. The results showed that the order of litterfall interception mass in different plantations was Pinus elliottii>Acacia crassicarpa>Eucalyptus urophylla>Castanopsis hystrix, which is related to the total litter mass, canopy cover and fern cover, while the order of litterfall interception proportion was Eucalyptus urophylla (99.8%)>Acacia crassicarpa (73.5%)>Pinus elliottii (56.3%)>Castanopsis hystrix (27%), and more leaf litters were intercepted by the bottom layer (0-50 cm) than that by top layer (50-100 cm) of understory fern Dicranopteris Dichotoma in all four plantations, that resulted from aboveground biomass of understory fern and physical characteristics of the litters. These results indicated that litter mass was not underestimated in calculating net primary production in South China, but spatial distribution of litterfall changed, which may change ecosystem processes, such as litter decomposition and soil respiration. These topics should be explored in the future.