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VEGETATION FIELD PROGRAM <br /> ,.xav:,sama�xmm:icemen;nanw;rr.�m:m:xmx+anx.::�:.s..ea-:m;x:;e:;:x:�:;x:;u.raua:»:x:x::::.:�.:aavwwm�.wxmc�x+ars�xassrrrs.M:s•x;c:mrrn�.x:>�:s�:cro:x:x;�;:,:m:t::;:;>:;:s:a: ' <br /> The proposed vegetation survey will be conducted be used to determine adequate sample size. If the <br /> in September after most plant species have results of the sample adequacy calculations from <br /> achieved maximum growth and production. Ac- the first five transects indicate more transects are <br /> tivities to be conducted during this survey include needed than were initially mapped, additional <br /> an estimation of vegetative cover and plant spe- transects will be laid out in the field. In any case, <br /> ties diversity using point-intercept transects. The the maximum number of transects that may be <br /> precise procedures to be used are described below. conducted in each area will be 50 transects. <br /> VEGETATIVE COVER Ground cover will be estimated along each tran- <br /> sect at 0.3-meter (1-foot) intervals. Cover will be <br /> classified as vegetation, litter, or rock. Lack of <br /> Vegetative cover will be estimated using cover will be classified as bare soil. Vegetation <br /> 30.5-meter (100-foot) long point-intercept tran- will also be classified by species. Each transect <br /> sects. Transects will be established in both of the will consist of 100 point samples. Each point <br /> reclaimed areas and the big sagebrush reference sample will be determined by projecting an ocular <br /> area (only the big sagebrush community was siting device vertically downward to the sample <br /> disturbed during mining). The actual number of location on the transect and recording all "hits" <br /> transects conducted in each of the three areas will on vegetation. First "hits" and subsequent "hits" <br /> be determined using the Snedecor-Cochran sample will be tallied separately. Only first "hits" will be <br /> size adequacy formula shown below, used to estimate total vegetative cover according <br /> to the following formula: <br /> Percent Total Veg.Cover = #of hits on vegetation <br /> where: total num-- re�o�mts <br /> Nm„ = the minimum number of observa- <br /> tions needed, SPECIES COMPOSITION <br /> t = 1.64 (the t-table value for a two- <br /> tailed (-test with infinite degrees The composition of plant species in each area will <br /> of freedom at the 90%confidence be evaluated using the same data acquired from <br /> level), the vegetative cover transects. However, the <br /> s2 = the sample variance, following formula which uses all "hits" will be <br /> d = .1 (level of precision for estimate used to determine the percent contribution of <br /> of the mean to be within 10% of each species to the total plant species diversity: <br /> the actual mean), and <br /> z = sample mean. total # of nits on s eeies X <br /> P %" Species XCover = tota number o uts <br /> Prior to the start of field work, approximately 15 As with the cover transects, data from the first <br /> to 20 transects will be randomly located,oriented, five transects will be used to determine adequate <br /> and mapped in each of the three areas using a sample size. If the results of the sample adequacy <br /> random numbers table. Transect locations or calculations indicate more transects are needed <br /> orientations that result in overlap of previous for the species composition evaluation than are <br /> transects or the sampling area boundary will be needed for the vegetative cover assessment, the <br /> discarded and new locations and/or orientations additional transects will be conducted. However, <br /> selected. Once in the field, the first five transects as for the vegetative cover survey, the maximum <br /> in each area will be located, staked to facilitate number of transects that may be conducted in <br /> relocation,and run. Data from these transects will each area will be 50 transects. <br /> Page 2 -- Draft - June 9, 1989 <br />