青海省海南洲2018年中考地理真题试题（扫描版，含答案）
123456【答案】 1.B2.A3.C4.A5.D6.B7.D8.A9.B10.B 11.C12.D13.A14.D15.C16.A17.D18.C19.B20.C 21.【答案】(1)降水量少(低于400毫米)，地下水位低，树木生长所需水分不足。(3分)地表1米以下存在干土层，影响树木根系发育和下扎。(3分)风大，易动摇树木根系。(2分)(2)树木生长不良(形成“小老头树”)。(2分)树木(“小老头树”)影响林下草本植物的生长，植被防止水土流失的功能减弱(不利于当地自然植被的恢复)。(3分)树木(“小老头树”)会蒸腾更多水分，树木根系吸水会使地下土层更干，导致区域环境更干燥。(3分)...
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