Ecological Archives E087-055-A1

M. Zeiter, A. Stampfli, and D. M. Newbery. 2006. Recruitment limitation constrains local species richness and productivity in dry grassland. Ecology 87:942–951.

Appendix A. Habitat quality and soil conditions at the three study sites in southern Switzerland. All values were backtransformed after ANOVA, except for bare ground. Means not sharing lettered superscripts differed significantly (df = 2, 27; P < 0.01; except for productivity and bare ground P < 0.05). Soil samples from representative profiles in close vicinity of experimental plots (H. Pestalozzi, unpublished data).

   

Negrentino

Poma

San Giorgio

 

F

P

               

Annual productivity (g/m2)

 

331.6a

285.4b

207.3c

 

27.43

< 0.001

Gaps (%)

 

70.9a

56.4b

64.9b

 

14.15

< 0.001

Bare ground (%)

 

14.8a

0.6c

3.6b

 

54.1

< 0.001

Radiation (W/m2)

             

     annual mean

 

5686c

7404a

6179b

 

21.84

< 0.001

     summer mean

 

4081b

4882a

3887b

 

14.64

< 0.001

     within-site range

 

2352

1283

3159

 

.

.

               

Soil pH

 

5.4-6.6

5.0-5.5

5.7-7.2

 

.

.

Clay content (%)

 

29

23

70

 

.

.

Available water capacity §(mm)

 

222

127

96

 

.

.

Adsorbed Al-cations || (mg/kg)

 

2-21

179-492

0-4

 

.

.

Adsorbed Ca-cations || (g/kg)

 

0.3-2.7

0.5-1.0

5.1-8.3

 

.

.

Annual precipitation sum (mm)

 

1731

2074

1871

 

.

.

† Range of samples across all layers containing roots (A, B, BC-strata), potentiometric measurements in water.

‡ Using pipette method, Gupta S., and H. Häni 1989. Methoden für Bodenuntersuchungen. Schriftenreihe der Eidg. Forschungsanstalt für Agrikulturchemie und Umwelthygiene, Liebefeld-Bern.

§ Estimates averaged by layers using tables from AG Bodenkunde 1982. Bodenkundliche Kartieranleitung. Third Edition, Hannover.

|| Range of samples across all layers containing roots (A, B, BC-strata), measured in a 1 N NH4Cl extract using a IPC-atomemission spectrometer (Bausch & Lomb ARL 3580, New York, USA).



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