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 groundP < 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 Soil samples from representative profiles in close vicinity of experimental plots (H. Pestalozzi, unpublished data).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)	331.6^a	285.4^b	207.3^c	27.43	< 0.001
Gaps (%)	70.9^a	56.4^b	64.9^b	14.15	< 0.001
Bare ground (%)	14.8^a	0.6^c	3.6^b	54.1	< 0.001
Radiation (W/m²)
annual mean	5686^c	7404^a	6179^b	21.84	< 0.001
summer mean	4081^b	4882^a	3887^b	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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