梧桐

27 (33.75)

72 (41.86)

35 (50.00)

4.054

0.044*

榆树

53 (66.25)

111 (64.53)

54 (77.14)

1.839

0.175

葎草

11 (13.75)

24 (13.95)

8 (11.43)

0.159

0.690

艾蒿

5 (6.25)

16 (9.30)

3 (4.29)

0.152

0.697

豚草

11 (13.75)

26 (15.12)

9 (12.86)

0.018

0.894

猫毛

16 (20.00)

40 (23.26)

11 (15.71)

0.344

0.557

狗上皮

14 (17.50)

52 (30.23)

10 (14.29)

0.099

0.753