漆树、臭椿、毒葛还有别的一些碍眼的植物要挟着几株仍然在艰难生活着的百合、铁线莲和蔷薇。
Sumac, ailanthus, poison ivy and other uninvited things threaten the few lilies and clematis and roses that still struggle for survival.
连作条件下根系分泌物的逐年积累产生的自毒效应，可能就是百合连作障碍产生的重要原因。
Tissue culture methods were used to simulate the allelopathy effect of lily root exudates under sterilized conditions.
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