禾草混播人工草地早期主要杂草种子库研究

对土壤主要杂草种子库的动态变化进行了研究,结果表明:1)随土壤深度的增加种子含量呈下降趋势,绝大部分种子分布在0~15 cm的土壤中。2)在高寒地区种子繁殖植物种子库的输出主要发生在5-6月,种子库种子1龄时大量输出,3龄、4龄时输出很少。3)一年生或二年生杂草在3龄、4龄草地中几乎“消失”,并不是土壤中缺乏种子。4)种子库中种子的生活力除灰绿藜Chenopodium glaucum外均大于90%。5)人工草地早期出现的多年生杂草种子发芽率高。

Seed bank of weeds in mixture grassland of cultivated perennial grasses in alpine area

The weeds gravely harm the quality and quantity of the first-and the second-year old cultivated grassland while they almost disappear in third-or forth-year-old grassland.To learn the reason and the relation of the seed bank and the succession of the weeds,we studied the seed bank and its input and output.The results are as follows: 1) The seeds decrease as the depth of soil increases and most seeds are in the 0~15 cm soil.2) The output of seed bank in alpine area is mainly during May and June.The seed output largely in one-year-old grassland and little in the three-year-old and four-year-old.3) The reason why weeds almost disappear in third-and forth-year-old grassland is not lack of seeds.4) The germination rate of the weeds with the exception of Chenopodium glaucum is more than 90%.5)The potential germination of the perennial weeds is high.