【題目】石漠化已成為西南地區(qū)頭號生態(tài)災難，治理石漠化刻不容緩。下列屬于石質(zhì)荒漠化形成的條件有（ ）

①高溫多雨的氣候 ②可溶性巖石廣布 ③晝夜溫差大 ④地勢低洼，易于積水

A. ①② B. ①③ C. ②③ D. ③④

【答案】A

【解析】

石灰?guī)r地層是形成喀斯特地形的基礎，它們是遠古時代海洋沉積物形成的地層，這些石灰?guī)r地層，陸續(xù)上升并出露地表后，經(jīng)過復雜而漫長的外力作用，逐漸形成為喀斯特地形。

自然因素是石漠化形成的基礎條件。①巖溶地區(qū)豐富的碳酸鹽巖具有易淋溶、成土慢的特點，是石漠化形成的物質(zhì)基礎。山高坡陡，②氣候溫暖、雨水豐沛而集中，為石漠化形成提供了侵蝕動力和溶蝕條件。此外，巖溶地區(qū)人口密度大，地區(qū)經(jīng)濟貧困，群眾生態(tài)意識淡薄，各種不合理的土地資源開發(fā)活動頻繁，導致土地石漠化。故選A。

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