横断山区植被分区

VEGETATION REGIONALIZATION OF THE HENGDUAN MOUNTAINOUS REGION

横断山区位于青藏高原的东南部,即25°40′—32°30′N,97 00′—102°40′E。这里地势高亢,山川相间作南北向平行排列,高差2000—3000米。区内具有从亚热带至冰雪带的不同自然景观。植被的地域分异十分显著。植被分布呈现出山原植被垂直带规律。据此,将本区植被划分为2个植被区域,3个植被地带,11植被地区。

The Hengduan Mountainous Region is situated in Southeast Qinghai-Xizang Plateau, covers a 400000km2 area lying at 25°40'- 32°30'N, 97°00' -102°40'E. The regional differentiation of local vegetations is obvious.According to physico-geographic characters above-mentioned and distributing regularities of local vegetations, vegetations of the Hengduan Mountainous Region may be divided into 2 vegetation regions, 3 vegetation zones and 11 vegetation provinces. That is;1 .Subtropical evergreen .broad-leaved forest region:I 1. South subtropical semi-humid evergreen broad-leaved forest zone; Ⅰ 1(1).Panzihua-Yuanmou mountain Pinus yunnanensis forest province, Ⅰ1(2).Lushui-Yunlong mountain plateau Castanopsis delavayi forest and Pinus yunnanensis forest province. Ⅰ 2,.North subtropical Pinus yunnanensis forest and humid evergreen broad-leaved forest zones Ⅰ 2(1). Bijiang-Gonshan valley humid evergreen broed-leaved forest province, Ⅰ 2(2). Li Jiang-Weixi Pinus yunnanensis and deciduous oak mixed forest province, Ⅰ 2(3).Xichang-Muli Pinus yunnanensis forest and Picta likiangensis forest province, Ⅰ 2(4).Luding-Shimian evergreen and deciduous broad-leaved mixed forest province. Ⅰ .Qinghai-Xizang Plateau alpine vegetation region:Ⅱ 1.Southeast Qinghai-Xizang Plateau cold temperate evergreen coniferous forest zone- 2222222 1(1).Deqin-Xiangcheng Picea brachytyla var.com-planata forest and Abies georgei forest province, Ⅱ 1 (2) .Qianning-Ya-jiang Pinus densata forest and Picea likiangensis var.balfouniana forest province, Ⅱ 1 (3) .Changdu-Baiyu Picea likiangensis var. balfouniana and Abies squamata forest province, Ⅱ1(4).Ganzi- Luhuo Picea forest and Abies forest province,Ⅱ1 (5). Jinchuan-Kangding Picea and Abies mixed forest province.