TAILIEUCHUNG - Báo cáo " Characteristics of the voi mep massif’s altitudinal belt differentiation "

The Voi Mep massif of the Truong Son range, having the highest peak in the Quang Tri area (1739m), is composed of granite and granodiorite intrusive rocks in Ben Giang-Que Son complex. This massif is fairly isometric with characteristic landforms comprising: remnants of old pediment surfaces, mountain slopes and valleys with steep profiles. The massif area has a regular altitudinal differentiation manifested in the formation of two climatic belts: tropical humid climatic belt, subtropical humid climatic belt; two altitudinal soil belts: red yellow soil belt and red yellow humus soil belt; four altitudinal vegetation cover types: evergreen broadleaf. | vnu. journal of science earth sciences n0i 2007 characteristics of the voi mep massif s altitudinal belt differentiation Truong Quang Hai Institute of Vietnamese Studies and Development Sciences VNU ABSTRACT. The Voi Mep massif of the Truong Son range having the highest peak in the Quang Tri area 1739m is composed of granite and granodiorite intrusive rocks in Ben Giang-Que Son complex. This massif is fairly isometric with characteristic landforms comprising remnants of old pediment surfaces mountain slopes and valleys with steep profiles. The massif area has a regular altitudinal differentiation manifested in the formation of two climatic belts tropical humid climatic belt subtropical humid climatic belt two altitudinal soil belts red yellow soil belt and red yellow humus soil belt four altitudinal vegetation cover types evergreen broadleaf closed forest mixed broadleaf needleleaf forest needleleaf forest and association of Arundinaria sat. The combination and interaction of natural components led to the formation of two altitudinal landscape belts mountain foot tropical landscape belt and medium montane subtropical landscape belt. 1. The problem Altitudinal belts or altitudinal zones are represent altitudinal landscape zones in the mountainous region relatively homogeneous in natural conditions with the altitudinal range determined by latitudinal locations of the area relative to horizontal natural zones as well as topographic geologic conditions Xpiridonov 1980 . Massifs can be differentiated into altitudinal landscape zones and component natural zones such as altitudinal climatic pedologic and biologic belts Avessalomova et al. 2004 Zhang Baipang 2002 Corbutt and Edwards 2004 . Thai Van Trung 1999 distinguished five groups of generating ecological factors geography-topography climatic-hydrologic regime mother rocks-soils flora and fauna and humans. Out of these topographic elevations are factors generating altitudinal belts. In Vietnam the great .

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