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Table 8 Calculated mean percentage (%) and standard deviations (SD) of occurrence of target species, competing species and the ratio target species to competing species for semi-natural grassland, heathland and deciduous forests for the four scenarios in 2030 compared to 1990, the p value, indicating the significance level for the difference from the reference scenario (BB—2030)

From: Modelling impacts of acid deposition and groundwater level on habitat quality and plant species diversity

Scenario

Target species

Competing species

Target/competing

 

%

SDa

pb

%

SD

pb

−

pb

 

Semi-natural grassland

 

1990

3.93

7.1

**

12.38

13.3

***

0.542

***

BB 2030

4.14

7.1

-

11.94

13.9

-

0.585

-

IB 2030

4.04

7.0

-

12.10

14.0

-

0.573

-

BI 2030

4.27

7.0

*

11.75

13.2

-

0.519

***

II 2030

4.18

6.9

-

11.68

13.3

*

0.504

***

 

Heathland

  

1990

0.67

2.2

**

11.69

22.0

-

0.066

-

BB 2030

0.78

2.8

-

12.23

22.5

-

0.073

-

IB 2030

0.84

2.9

-

13.04

23.1

*

0.072

-

BI 2030

1.14

3.9

***

15.33

25.5

***

0.123

***

II 2030

1.23

3.9

***

16.35

26.3

***

0.120

***

 

Deciduous forest

  

1990

2.58

4.9

***

12.87

19.0

-

0.245

***

BB 2030

3.00

5.5

-

12.22

19.1

-

0.323

-

IB 2030

3.04

5.4

-

12.31

19.2

-

0.324

-

BI 2030

3.53

5.1

***

14.45

20.1

***

0.330

-

II 2030

3.59

5.2

***

14.51

20.2

***

0.338

-

  1. aStandard deviation
  2. b p value, indicating the significance level for the difference from the BB scenario (2030):
  3. - no difference (0.10 < p)
  4. ~ indication for a difference (0.05 < p < 0.10)
  5. *a significant difference (0.01 < p < 0.05)
  6. **a strong significant difference (0.001 < p < 0.01)
  7. ***a very strong significant difference (p < 0.001)