[题目]读各种森林类型在不同坡度下单位面积水源涵养量统计表.回答下列小题.坡度马尾松林阔叶林混交林灌木林毛竹林经济林平坡881．841 063．88952．54724．131 011．791167．11缓坡839．361 190．42834．80677．761 092．071 158．72斜坡797．051 140．70857．60716．26 题目和参考答案——青夏教育精英家教网—

【题目】读各种森林类型在不同坡度下单位面积水源涵养量（m/hm）统计表，回答下列小题。

坡度	马尾松林	阔叶林	混交林	灌木林	毛竹林	经济林
平坡	881．84	1 063．88	952．54	724．13	1 011．79	1167．11
缓坡	839．36	1 190．42	834．80	677．76	1 092．07	1 158．72
斜坡	797．05	1 140．70	857．60	716．26	852．49	1 142．20
陡坡	695．22	1 133．48	915．44	685．38	883．12	1 164．80
急坡	675．82	1 055．53	701．76	662．66	862．24	－

【1】单位面积水源涵养量最大的森林类型是

A．阔叶林 B．毛竹林 C．经济林 D．马尾松林

【2】下列关于森林水源涵养功能的说法，正确的有

①能抬高地下水水位，加速水循环

②森林的水源涵养功能是指森林对降水的截留作用

③能起到减缓地表径流、保持水土的作用

④不同类型的森林由于树冠、根系的差异，其水源涵养的能力不同

A．①② B．③④ C．①④ D．②③

【答案】

【1】C

【2】B

【解析】

【1】根据表格数据，不考虑坡度差异，单位面积水源涵养量最大的森林类型是经济林，C对。

【2】森林具有涵养水源的功能，增加下渗，从而抬高地下水水位，减缓水循环速度，①错。森林的水源涵养功能是指森林对降水的吸收、调节作用，②错。能起到减缓地表径流、保持水土的作用，③对。不同类型的森林由于树冠、根系的差异，其水源涵养的能力不同，④对。B对。

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