Ectomycorrhizal communities in a Mediterranean forest ecosystem dominated by Quercus ilex: seasonal dynamics and response to drought in the surface organic horizon

Table 1 Species richness, diversity and heterogeneity estimators of ECM communities at the Puechabon site during the period December 2007–June 2009

Parameter	Control plots			Rainfall exclusion plots
Parameter	Spring	Autumn	Total	Spring	Autumn	Total
Number of species^a	40.5 (154.5)	37 (122)	61.5 (276.5)	37.5 (153)	36 (144)	60.5 (297)
Rarefied number of species^b	28.8 (81)	30.4 (81)	93.3 (541)	27.1 (81)	27 (81)	88.8 (541)
Fisher’s alpha^c	18.32	17.88	24.39	16.31	15.99	23.53
Simpson’s (1-D) index of diversity^c	0.92	0.91	0.92	0.92	0.91	0.94
Shannon–Wiener information index (H′)^c	4.36	4.27	4.74	4.29	4.21	5.04
Total number of sampled ECM tips	309	244	553	306	288	594

^aValues are mean numbers of species per sampling years (n = 2 consecutive years) with mean numbers of ECM tips per sampling year within parentheses
^bRarefaction analyses were conducted on spring and autumn communities in control and rainfall exclusion plots on the one hand (minimal sample size n = 81 root tips) and on total communities in control and rainfall exclusion plots on the other hand (minimal sample size n = 541 root tips)
^cValues of diversity and heterogeneity estimators are mean numbers per sampling years (n = 2 consecutive years)

ISSN: 1297-966X