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【题目】采用小流域为单位的整体模型实验,检验黄土高原小流域综合治理水土保持规划的合理性。据表1数据,完成下列问题。

不同植被覆盖率林草措施减流减沙效益表

植被覆盖率(%)

降水量

(mm/30min)

径流产生量

(㎜/30min)

入渗量

(㎜/30min)

产沙总

量(g)

减流效益(%)

减沙效益(%)

100

60

9.77

50.23

0.85

80.78

99.3

85

60

20.46

39.54

1.52

59.75

98.77

70

60

27.31

32.69

4.34

46.27

96.48

60

60

38.24

21.76

24.11

24.77

80.41

40

60

41.91

18.09

57.29

17.53

53.45

20

60

42.44

17.56

88.75

16.51

27.89

0

60

50.83

9.17

123.07

0

0

【1】下列叙述正确的是

A.径流产生量随植被覆盖率增大而增大

B.入渗量随植被覆盖率减小而增大

C.径流产生量随入渗量减少而增大

D.产沙总量随入渗量增大而增大

【2】在植被覆盖率变化幅度相同的条件下,对减流减沙效益影响最大的植被覆盖率变化范围是

A.20%—40% B.40%—60% C.60%—70% D.70%—85%

【答案】

【1】C

【2】C

【解析】

试题分析:

【1】依据表格数据,经流产生量随植被覆盖率减小而增大,随着入渗量减小而增大,随植被覆盖率减小入渗量减小,产沙量增大,产沙总量随入渗量增大而减小,C正确。

【2】依据表格数据,在植被覆盖率变化幅度相同的条件下,对减流减沙效益影响最大的植被覆盖率变化范围是60%—70%,C正确。

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