恶性杂草马齿苋（Portulaca oleracea）种子萌发特性的研究

为了明确恶性杂草马齿苋种子的萌发特性,本文研究了温度、光照、pH、水势、盐分及土层深度对其种子萌发的影响。结果表明：马齿苋种子在光照L∥D=14 h∥10 h、温度白天32 ℃，晚上28 ℃的变温条件下萌发率最高，为92%。马齿苋种子萌发适宜的酸碱度范围较宽，在5

Studies on the characteristics of seed germination of a vicious weed species, common purslane

The seed germination behavior of common purslane (Portulaca oleracea), a vicious weed species in flowering Chinese cabbage, was investigated in Guangdong. The effects of temperature, light, pH, osmotic stress, salt stress, and soil depth on seed germination were studied. The results showed that the optimum day/night temperature for seed germination of Portulaca oleracea was 32/28 ℃ and 14L〖DK1〗∶10D. Over 60 % of seeds were germinated between pH 5.0-10.0, and no seed germination at pH 4.0. The seed germination of Portulaca oleracea reached 43.33 % under a high osmotic potential of-0.8 MPa, which could germinate (53.33 %) even at 160 mmol/L NaCl, indicating that Portulaca oleracea was quite tolerant to arid and salty environments. Seedling emergence was at its maximum (90.83 %) on the soil surface but declined significantly with the increase of soil depth. These results indicated that environmental factors have significant influences on seed germination of Portulaca oleracea, and more knowledge about them can lead us to develop an integrated weed management strategy in flowering Chinese cabbage fields and prevent further damages.