【題目】說(shuō)一說(shuō)我國(guó)“大興安嶺”的重要地理意義。

【答案】大興安嶺：東北平原與內(nèi)蒙古高原的分界線；半濕潤(rùn)區(qū)與半干旱區(qū)的分界線（400毫米等降水線）；季風(fēng)區(qū)與非季風(fēng)區(qū)的分界線；溫帶落葉闊葉林與溫帶草原的分界線；種植業(yè)區(qū)與畜牧業(yè)區(qū)分界線；大興安嶺是第二和第三階梯的分界線。

【解析】

試題大興安嶺位于黑龍江省、內(nèi)蒙古自治區(qū)北部，是內(nèi)蒙古高原與松遼平原的分水嶺。北起黑龍江畔，南至西拉木倫河上游谷地，東北—西南走向，全長(zhǎng)1200多公里，寬200-300公里，海拔1100-1400米。它是我國(guó)重要的地理分界線，主要是大興安嶺東西降水不同，以西降水少，以東降水多，是半濕潤(rùn)區(qū)與半干旱區(qū)的分界線（400毫米等降水線）；以西受季風(fēng)影響小，以東受季風(fēng)影響大，是季風(fēng)區(qū)與非季風(fēng)區(qū)的分界線；另外還是溫帶落葉闊葉林與溫帶草原的分界線；種植業(yè)區(qū)與畜牧業(yè)區(qū)分界線；大興安嶺是第二和第三階梯的分界線。

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