太行山南段沟谷杂木林的群落学特征及起源初探

SOME SYNECOLOGICAL FEATURES AND ORIGIN OF THE MIXED BROADLEAVED FOREST IN GULLIES AND DEEP VALLEYS OF SOUTHERN TAIHANG MOUNTAIN RANGE

太行山南段沟谷杂木林种类组成丰富、无明显优势种、结构复杂、低山沟谷杂木林含有大量亚热带成分,中山沟谷杂木林以北方温带典型种属为主,物种在沟谷分布受潮湿、温暖的生境条件影响.本区杂木林是一种异质性残遗群落.

This paper mainly discusses the mixed broadleaved forest in gullies and deep valley of southern Taihang Mountain region. The following conclusions can be drawn:(1)It is a stable,species-rich,structure-complicated vegetation type without an evident dominant.(2)This vegetation type can be divided into two kinds:the one in lower altitude and the one in higher altitude. There are a large number of subtropical species in the former one,especially in tree layer,which can not be seen in zonal forest types.(3)The warmer and moister habitat in gullies and deep valleys is the main reason that species assemble there.(4)The mixed broadleaved forest in lower altitude is a kind of 'heterogeneous remnant community'.The aim of this paper is to provide theoretical reference for further studies of this unique community type and to provide scientific basis for the study of environmental change and nature conservation of this area.