题目内容

【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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