摘要
为进一步明确三七的连作效应,以不同种植年限及不同空间分布的土壤为栽培基质,研究了连作对三七种子萌发及种苗生长的影响。结果表明:连作使三七种子萌发的最大速度增加,种子的发芽势变化不大,而发芽率、发芽指数和快速发芽期则呈明显降低或变短的趋势;与根区外土相比,根区土和根区下土使三七种子的发芽势、发芽率和发芽指数显著降低,对种子萌发的最大速度也有降低的作用;种植1年三七的土壤(1年土)对后茬三七种苗的生长并无明显障碍效应,2年土比3年土具有更强的抑制三七种苗生长的作用。连作对三七种子萌发及种苗生长均会产生明显的障碍效应,自毒作用可能只是造成三七连作障碍的原因之一。
A pot experiment was conducted to explore the influence of Panax notoginseng continuous cropping on the seed germination and seedling growth of the plant. Under continuous cropping, the maximum seed germination speed of P. notoginseng increased, germination vigor changed little, while the germination rate, germination index, and fast germination stage decreased, compared with those under 1-year cropping. The seed germination vigor, germination rate, and germination index in root region soil and under-root region soil decreased significantly, and the maximum germination speed also decreased, compared with those in outer-root region soil. The 1-year P. notoginseng-cropped soil had no obvious obstacle effect on the seedling growth of followed cropped P. notoginseng, but the 2-year P. notoginseng-cropped soil had stronger inhibitory effect than the 3-year P. notoginseng-cropped soil. Our results suggested that P. notoginseng continuous cropping could produce obstacle effect on the seed germination and seedling growth of the plant, and autotoxicosis could be one of the main reasons that led to the P. notoginseng continuous cropping obstacle.
出处
《生态学杂志》
CAS
CSCD
北大核心
2010年第8期1493-1497,共5页
Chinese Journal of Ecology
基金
国家十一五科技支撑计划项目(2006BAI09B03)
中国博士后科学基金资助项目(20080440337)
关键词
三七
连作障碍
种子萌发
种苗生长
Panax notoginseng
continuous cropping obstacle
seed germination
seedling growth
