Laserfiche WebLink
86 <br />noted here that those panels which had the higher levels of biomass !~ <br />production also contained the smaller number of invading species. <br />The total density of invading species showed differeing response <br />according to seed mixture. On the five excavated panels (this excludes <br />Panel 4, soil check) the introduced seed mixture generally allowed the <br />greatest number of invading species followed by the native and then the <br />combination seed mixture. The seed mixture composed of introduced <br />species exhibited the lowest biomass of seeded species across all six <br />panels and all three seed mixtures. The combination of native and <br />introduced species, which generally had the highest biomass of seeded <br />species, allowed the lowest density of invading species. A seed mixture <br />that is showing high biomass production is making more complete use of ' <br />!~ <br />resources (light, water, and nutrients) available at that particular site. 1 <br />When this occurs, less resources or open space is available for the ~" <br />invading plant species to utilize, and lower numbers of invading species <br />result. <br />Total Density of Forbs. The total density of forb species, both <br />seeded and invading, showed a significant interaction (P=.0004) between <br />seed mixture and soil-shale profile. In most cases, a greater density of <br />forbs was observed in the introduced seed mixture than either the combina- <br />tion or native seed mixtures (Figure 28). These differences can be <br />partially explained by the number of forbs seeded and the seeding rate of <br />forbs per seed mixture. They were: <br />Seeding Rate PLS <br />Seed t1ixture Number of Forbs (ko/ha) _ <br />I <br />1--Combination 5 3.82 <br />• 2--Native 3 2.24 <br />3--Introduced 6 5.60 ~- <br /> <br />