CAJ | 학술논문

根据采自福建省中部戴云山脉亚高山水系源头地带(大致25°40'N,118°11'E)泥炭沉积洼地的孢粉纪录,对该地区亚热带山地植被近4 000年来的变化进行了研究.孢粉记录和其他沉积资料显示,3个取样点的泥炭沉积开始于4 000年前,很可能是全新世后期气候转冷的结果.在距今4 000～1 200年前期间,戴云山脉上部(海拔1 300～1 600 m)的植被为亚热带针阔叶混交类型,优势种属包括Cryptomeria(柳杉)、Castanopsis(栲)、Quercus(栎)和Tsuga(铁杉)等.距今1 200年前左右,该区域的植被发生了一次大的变化,表现在上述优势属种的孢粉在样品总孢粉数的比例突然下降,而Pinus(松),Gramineae(禾本科)以及Dicranopteris(芒萁)等属种的比例则提高了.这次剧烈的植被变化在其中的一个泥炭钻孔中留下了一层粘土记录,它代表了当时流域内植被受破坏后出现的严重土壤侵蚀.从泥炭沉积提取的孢粉记录还可以看出,研究区内广泛分布的松林是一种次生植被,它是人类不断干扰的结果.
근거채자복건성중부대운산맥아고산수계원두지대(대치25°40'N,118°11'E)니탄침적와지적포분기록,대해지구아열대산지식피근4 000년래적변화진행료연구.포분기록화기타침적자료현시,3개취양점적니탄침적개시우4 000년전,흔가능시전신세후기기후전랭적결과.재거금4 000～1 200년전기간,대운산맥상부(해발1 300～1 600 m)적식피위아열대침활협혼교류형,우세충속포괄Cryptomeria(류삼)、Castanopsis(고)、Quercus(력)화Tsuga(철삼)등.거금1 200년전좌우,해구역적식피발생료일차대적변화,표현재상술우세속충적포분재양품총포분수적비례돌연하강,이Pinus(송),Gramineae(화본과)이급Dicranopteris(망기)등속충적비례칙제고료.저차극렬적식피변화재기중적일개니탄찬공중류하료일층점토기록,타대표료당시류역내식피수파배후출현적엄중토양침식.종니탄침적제취적포분기록환가이간출,연구구내엄범분포적송림시일충차생식피,타시인류불단간우적결과.
This study examines the pollen evidence of vegetation change in the subtropical mountains in southeastern China based on three short sediment cores from the elongated peat-filled depressions in subalpine headwater zones from the Daiyun Mountain Range in central Fujian Province (approximately 25°40'N,118°11 'E). Analysis of pollen and sediment-stratigraphic data indicates that peat accumulation began in the three coring sites after 4 000 a BP, probably as a result of the late-Holocene cooling. From 4 000 to 1 200 a BP the vegetation of the upper mountain zones (between 1 300 ～ 1 600 m) of the Daiyun Mountain Range was a subtropical mixed conifer-hardwood forest dominated by Cryptomeria (Japanese cedar), Castanopsis (chinkapin), Quercus (oak), and Tsuga (hemlock). A major change in vegetation cover occurred around 1 200 a BP when pollen frequencies of these dominant tree taxa were abruptly reduced, followed by increases in Pinus, Gramineae, and Dicranopteris. This vegetation change was marked by a distinct clay layer in one of the sedinent cores, suggesting intensified soil erosion occurred on the slopes of the catchments area due to destruction of the climax vegetation. The extracted pollen records indicate that pine woodland in the study area is a secondary vegetation type and is a result of constant human disturbance.