问题描述：
英语翻译
Species were selected with respect to their
affiliation to defined functional groups (grasses,forbs,leguminous
forbs),to life span (perennials),to overall importance in nearby and
Central European grassland systems,and to the fact that they do
naturally grow on substrate similar to the one used in this experiment.
One hundred plant individuals per plot in defined quantitative
composition were planted in a systematic hexagonal grid with 20 cm
distance between individuals in early April 2005.Grass and forb individuals
used in the experiment were grown from seeds in a greenhouse
in the preceding fall.Thus,all plants were in a juvenile stage
during manipulation and data acquisition.All plants had been acclimated
on site since February 2005,reaching growth heights of
c.15 cm.Biomass at planting amounted to 0.1–0.6 g dry wt per individual.
These experimental communities represent naturally occurring
species combinations.The grassland plots were established at
two levels of species diversity (2 and 4 species) and three levels of
functional diversity (1,2,3 functional groups),resulting in three species
combinations or communities in total (Table 1) plus monocultures
of selected species.
Species were selected with respect to their
affiliation to defined functional groups (grasses,forbs,leguminous
forbs),to life span (perennials),to overall importance in nearby and
Central European grassland systems,and to the fact that they do
naturally grow on substrate similar to the one used in this experiment.
One hundred plant individuals per plot in defined quantitative
composition were planted in a systematic hexagonal grid with 20 cm
distance between individuals in early April 2005.Grass and forb individuals
used in the experiment were grown from seeds in a greenhouse
in the preceding fall.Thus,all plants were in a juvenile stage
during manipulation and data acquisition.All plants had been acclimated
on site since February 2005,reaching growth heights of
c.15 cm.Biomass at planting amounted to 0.1–0.6 g dry wt per individual.
These experimental communities represent naturally occurring
species combinations.The grassland plots were established at
two levels of species diversity (2 and 4 species) and three levels of
functional diversity (1,2,3 functional groups),resulting in three species
combinations or communities in total (Table 1) plus monocultures
of selected species.
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