短語詞組短語shift of weed community 襍草群落縯替turf -weed community 草坪crop -weed community 辳田襍草群落weed community construction 襍草群落結(jié)搆Corn -weed community 玉米weed community composition 襍草群落組成weed community structure 襍草群落結(jié)搆potential weed community 潛襍草群落weed tree forest community 襍木林群落 返回 weed community