三七连作土壤对其种子萌发及幼苗生长的影响
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国家科技支撑计划项目(2006BAI09B03)和中国博士后科学基金项目(20080440337)资助


Effects of continuous Panax notoginseng cropping soil on P. notoginseng seed germination and seedling growth
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    摘要:

    为明确三七连作的障碍效应,以不同连作年限及不同空间分布的土壤为基质,通过发芽和幼苗生长试验,研究了连作土壤对三七种子萌发及幼苗生长的影响。结果表明:①与新土相比,连作土壤处理下三七种子萌发的最大速度加快,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明显呈降低或变短的趋势;②随土壤连作年限的增加,三七幼苗的成苗率和株高均显著下降(p<0.05);③与根区外土相比,根区土和根区下土显著降低了三七种子的发芽势、发芽率和发芽指数,对种子萌发的最大速度也呈降低作用,但却使三七幼苗的地上生物量明显增加。连作土壤对三七种子的萌发及幼苗的生长均表现明显的障碍效应,化感(自毒)作用可能是造成三七连作障碍的原因之一。

    Abstract:

    To study the effects of Panax notoginseng continuous cropping on P. notoginseng seed germination and seedling growth, the main germination indexes, seedling growth indexes and R/S of P. notoginseng under different soil conditions were investigated and analyzed for ANOVA using DPS7.05 software package. The results showed:①Compared with first cropping soil, the maximum germination speed of P. notoginseng in continuous cropping soil increased, and germination vigor changed little, while the germination rate, germination index and fast germination stage decreased. ②The ratio of seedling survival and plant height of P. notoginseng decreased significantly (p<0.05) with the increase of cropping year. ③ Compared to outer-rhizosphere soil (CK), rhizosphere and under-rhizosphere soils inhibited significantly P. notoginseng seed germination, but promoted aboveground biomass of P. notoginseng seedling. Germination vigor, germination rate and germination index of P. notoginseng seed in rhizosphere and under-rhizosphere soils decreased significantly compared to CK, and the maximum germination speed of P. notoginseng also decreased. There were obvious obstacle effects of continuous cropping on seed germination and seedling growth in P. notoginseng, which may be related to the allelopathy (autotoxicity).

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张子龙,王文全,杨建忠,崔秀明.三七连作土壤对其种子萌发及幼苗生长的影响[J].土壤,2010,42(6):1009-1014. ZHANG Zi-long, WANG Wen-quan, YANG Jian-zhong, CUI Xiu-ming. Effects of continuous Panax notoginseng cropping soil on P. notoginseng seed germination and seedling growth[J]. Soils,2010,42(6):1009-1014

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