GENERAL50552 - Laserfiche WebLink

Home Browse Search

W .i- .. -Y~... '~ ' Messrs. Banta and -; August 29, 1980 ~ ~~ ..1 Page 2 '~ _,.. Statistical analysis revealed that no significant difference exists between the premine vegetation types and their respective reference areas, with one exception, as follows: in the Meadow Vegetation Type there is significant difference bctwr_en tlic premine and reference area for both production and cover. Since the reference area contained the higher cover and product Lon values, it will c~mtinue to he used as a reference area. Also, in the Meadow Vegetation Type plant species diversity was higher for the premine area. given though both premine and reference area have essentially the same number of plant species, 29 and 27 respectively, ~ [he premine area has more major species than the reference area. This discrepancy in diversity Ls attril,uted to the fact that the premine meadow sites were diverse in their pl,ysiral locations, one site being adjacent to a drainage channel and one site remote from the drainage channel, which increased the opportunity to have more dominant plant species in the combined data. Total number n( plant species and the number of major t species was generally prca[er for premine areas. ' With regards to measuring revegetation success on reclaimed sites, cover and production from [lie reference areas will he compared to the cover and production frorn the revugetated areas using the same statistical methods as those used to establish the reference areas prior to mining. The "t" test used for the analysis is given as: x 1 - x2 t - 52 nl + n2 P ~1'n2 Where xl = the average cover or production for the undis- turbed range site. x2 = the average cover or production for the refer- ence area. nl = sample ~~,izc Erom undisturbed range site. n2 = sample ,ize from the reference area. S2 = the pooled variance of samples Erom both Loca- p [ions expressed as: S2 = F x21 + Ex22 P nl + n2 - 2