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[地质][环境相关][中英对照]GEF项目四川本底情况(送中央项目办)(1)

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GEF项目四川本底情况
Sichuan Background of GEF Project

第一节自然概况
Section 1 Overview of Natural Environment

一、地理位置 I. Geographical position

四川省位于中国西南内陆腹地,地处长江上游,介于东经92°21′—108°12′、北纬26°03′—34°19′之间,与滇、黔、渝、藏、青、甘、陕等西部7省(市、区)接壤,是承东接西的纽带,连接西南和西北的桥梁,生态区位和地理区位十分重要。
Sichuan province is located in the inland hinterland of Southwestern China, specifically between longitude 92°21′—108°12′E and latitude 26°03′—34°19′N, bordering 7 provinces/municipalities/regions of Western China, namely Yunnan, Guizhou, Chongqing, Tibet, Qinghai, Gansu and Shaanxi. As it serves as a bond between Eastern China and Western China and a bridge linking Southwestern China with Northwestern China, it plays a very important role in ecological niche and geographical location.

1、四川省岩溶区主要分布在川西南山地区、川南盆地边缘区、川东平行岭谷区、盆中丘陵区,介于东经100 °07 ′— 107° 15′、北纬 26°10 ′—30 ° 41′之间。石漠化土地以川西南山地区和川南盆地边缘区为主。
1. The karst regions in Sichuan are mainly distributed in the mountainous area of Southwestern Sichuan, the basin margin of Southern Sichuan, the parallel ridge-valley region of Eastern Sichuan, and the mid-basin hill region, specifically between longitude 100°07′—107°15′E and latitude 26°10′—30°41′N. The rocky desertification land is mainly distributed in the mountainous regions of Southwestern Sichuan and the basin margin region of Southern Sichuan.

2、四川沙化土地主要分布在川西北地区,介于东经97°21′18″~104°24′21″,北纬27°07′28″~34°19′20″之间,西沿金沙江与西藏昌都地区相望,北连青海玉树、果洛两个藏族自治州和甘肃甘南藏族自治州、陇南市,东与绵阳、德阳、成都、雅安市和凉山州的冕宁县、德昌县交界,南连、攀枝花市和云南迪庆藏族自治州。
2. The desertified land in Sichuan is mainly distributed in Northwestern Sichuan, specifically between longitude 97°21′18″~104°24′21″E and latitude 27°07′28″~34°19′20″N, facing Cangdu, Tibet across the Jinsha River to the west, bordering Yushu and Guoluo Tibetan Autonomous Prefectures in Qinghai, and Tibetan Autonomous Prefecture Gannan and Longnan city in Gansu to the north, Mianyang, Deyang, Chengdu, Ya’an as well as Mianning County and Decang County in Liangshan Prefecture to the east, Panzhihua city and Dêqên Tibetan Autonomous Prefecture in Yunnan to the south.

二、地质地貌 Geology and geomorphology

四川位于我国大陆地势三大阶梯中的第一级和第二级,跨越第一级青藏高原和第二级四川盆地及其周围山地,高差悬殊,西高东低的特点特别明显。四川省大致可分为四川盆地和川西高原两大部分。西部为高原,海拔多在3500m以上;东部为盆地,海拔多在400—2000m之间。四川盆地是我国四大盆地之一,面积16.5万km2。盆地四周为邛崃山、岷山、大巴山等山地所环绕,重峦叠嶂。盆地中部海拔400—800m,地势微向南倾斜,岷江、沱江、嘉陵江从北部山地向南流入长江。西部川西高原,海拔3000—5000m,山高谷深,高山峡谷间大江如带,山、河呈南北走向,有沙鲁里山、大雪山等,金沙江、雅砻江、大渡河等穿流其间。四川地貌类型多样,有平原、丘陵、山地和高原4大类,以山地为主,其次为高原。
Sichuan is located on the first and second ones of the three major continental relief stairs in China, covering a portion of the first-stair Qinghai-Tibet Plateau and the second-stair Sichuan Basin and its surrounding mountains, its relief taking on a huge height difference of noticeably high west and low east. Sichuan province can be roughly divided into Sichuan Basin and Western Sichuan Plateau. The latter mostly has an altitude over 3500m, while the former reaches an altitude ranging from 400 to 2000m. Sichuan Basin is one of the four major basins in China, covering an area of 165,000km2. It is surrounded by many mountains such as Qionglai Mountains, Min Mountains, Daba Mountains and other mountains. The central portion of the basin varies from 400 to 800m in altitude, slanting slightly southward, where the Min River, Tuo River and Jialing River from the northern mountains flow into the Yangtze River to the south. The Western Sichuan Plateau at an altitude ranging from 3000 to 5000m accommodates many high mountains (e.g. Shaluli Mountains, Great Snow Mountains) and great rivers (e.g. Jinsha River, Yalong River, Dadu River) winding through deep valleys, both assuming a north-south strike. Sichuan has various landforms under four major categories: plain, hill, mountain and plateau. The third one is the main landform, followed by the fourth one.

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