Ecological Archives E087-167-A4

Selene Báez, Scott L. Collins, David Lightfoot, and Terri L. Koontz. 2006. Bottom-up regulation of plant community structure in an aridland ecosystem. Ecology 87:2746–2754.

Appendix D. Means (± SE) of cover, species richness, and heterogeneity of the grass and shrub vegetation in control and treatment plots. The two columns on the right summarize values for control and treatment plots across both vegetation types.

 

Vegetation type

 

 

 

 

Treatment

 

Shrub

Grass

Shrub

Grass

 

 

 

 

 

Access

Exclosure

Access

Exclosure

Access

Exclosure

Cover

 

 

 

 

 

 

 

 

Summer annuals

1.61 ± 0.26

5.12 ± 0.94

1.4 ± 0.34

1.82 ± 0.4

5.65 ± 1.46

4.6 ± 1.19

3.53 ± 0.78

3.21 ± 0.64

Winter annuals

1.16 ± 0.19

1.16 ± 0.18

1.41 ± 0.33

0.91 ± 0.19

1.26 ± 0.31

1.06 ± 0.2

1.34 ± 0.23

0.99 ± 0.14

Forbs

2.67 ± 0.33

6.3 ± 0.97

2.6 ± 0.48

2.73 ± 0.45

6.72 ± 1.54

5.88 ± 1.19

4.66 ± 0.84

4.31 ± 0.66

Grasses

6.61 ± 0.44

35.53 ± 1.1

5.6 ± 0.56

7.62 ± 0.64

35.73 ± 1.32

35.33 ± 1.78

20.67 ± 1.84

21.48 ± 1.82

Shrubs

30.99 ± 0.86

3.57 ± 0.29

32.4 ± 0.9

29.58 ± 1.45

2.97 ± 0.4

4.16 ± 0.41

17.69 ± 1.73

16.87 ± 1.61

Total

29.62 ± 0.98

43.47 ± 1.67

30.25 ± 1.2

29 ± 1.56

43.75 ± 2.34

43.2 ± 2.41

37 ± 1.51

36.1 ± 1.63

Species richness

 

 

 

 

 

 

 

 

Summer annuals

0.56 ± 0.04

1.31 ± 0.17

0.58 ± 0.05

0.54 ± 0.06

1.36 ± 0.25

1.27 ± 0.23

0.97 ± 0.13

0.9 ± 0.12

Winter annuals

0.5 ± 0.06

0.85 ± 0.08

0.57 ± 0.09

0.42 ± 0.08

0.83 ± 0.11

0.87 ± 0.11

0.7 ± 0.07

0.65 ± 0.07

Forbs

1.31 ± 0.09

2.79 ± 0.21

1.34 ± 0.14

1.28 ± 0.13

2.71 ± 0.29

2.87 ± 0.29

2.02 ± 0.18

2.07 ± 0.18

Grasses

0.93 ± 0.04

2.09 ± 0.04

0.88 ± 0.05

0.97 ± 0.06

2.11 ± 0.05

2.07 ± 0.06

1.5 ± 0.08

1.52 ± 0.07

Shrubs

0.92 ± 0.02

0.71 ± 0.03

0.9 ± 0.04

0.93 ± 0.04

0.68 ± 0.04

0.74 ± 0.04

0.79 ± 0.03

0.83 ± 0.03

Total

3.15 ± 0.11

5.59 ± 0.22

3.12 ± 0.16

3.18 ± 0.15

5.51 ± 0.31

5.68 ± 0.31

4.31 ± 0.22

4.43 ± 0.22

Heterogeneity

6132 ± 308

4245 ± 263

6866 ± 361

5399 ± 476

4485 ± 342

4004 ± 402

5675 ± 281

4702 ± 319




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