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            自然地理特點

            • 2018年04月17日 17時06分
            • 來源: 四川年鑒社
            • 【字體:
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              四川省位于中國西南,地處長江上游,介于東經92°21′~108°12′和北緯26°03′~34°19′之間,東西長1075余千米,南北寬900余千米。東連渝,南鄰滇、黔,西接西藏,北界青、甘、陜三省。面積48.6萬平方千米,次于新疆、西藏、內蒙和青海,居全國第五位。

              全省地貌東西差異大,地形復雜多樣。四川位于中國大陸地勢三大階梯中的第一級和第二級,即處于第一級青藏高原和第二級長江中下游平原的過渡帶,高差懸殊,西高東低的特點明顯。西部為高原、山地,海拔多在4000米以上;東部為盆地、丘陵,海拔多在1000~3000米之間。全省可分為四川盆地、川西北高原和川西南山地三大部分。

              東部四川盆地是中國四大盆地之一,面積16.5萬平方千米。盆地四周北部為秦嶺,東部為米倉山、大巴山,南部為大婁山,西北部為龍門山、邛崍山等山地環繞。氣候溫暖濕潤,冬暖夏熱,大部分地區年降水量900~1200毫米,屬亞熱帶濕潤季風氣候,植被為亞熱帶常綠闊葉林。農業利用方式為一年兩熟制。盆地西部為川西平原,土地肥沃,為都江堰自流灌溉區,土地生產能力高;盆地中部為紫色丘陵區,海拔400~800米,地勢微向南傾斜,岷江、沱江、涪江、嘉陵江從北部山地向南流入長江;盆地東部為川東平行嶺谷區,分別為華鎣山、銅鑼山、明月山。

              西北部為川西北高原,屬于青藏高原東南一隅,平均海拔3000~5000米,高寒氣候,高山草甸植被。

              西南部為橫斷山脈北段,山高谷深,山河相間,山河呈南北走向,自東向西依次為岷山、岷江、邛崍山、大渡河、大雪山、雅礱江、沙魯里山和金沙江。氣候植物呈垂直分布,主要分布為寒帶針葉林、溫帶針闊混交林、北亞熱帶常綠和落葉混交林、中亞熱帶常綠闊葉林。

             

            (此資料由四川年鑒社提供,內容來自《四川年鑒》2017卷)

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