退化混播人工草地白三叶繁殖特性的变化

本文研究退化混播人工草地白三叶有性及无性繁殖特性的变化规律。结果表明，随着草地由轻到重的退化，白三叶无性繁殖能力则显著提高，另外单位面积种子量在重度退化地段有明显增加。但是由于土壤理化性状的变劣，白三叶种群的频率，密度和地上生物量均随着草地退化的加重而显著减少。

Variation in Reproductive Characters of White Clover on a Degradation Series of Artificial Grassland

Variation in reproductive characters of white clover along a degradation series of artificialgrassland was studied in Nanshan state farm, Hunan Province. Results showed: vegetative reproduction ofwhite clover was strengthened with increasing grassland degradation; meanwhile, seed rain of white cloverwas increased with grassland degradation process and was highest on the heavily degraded guassland.However, density and above - ground biomass of white clover population were decreased significantly Whilegrassland dsgradaion became more severe,just because of deterioration of soil properties.