野生羊茅和■草在不同沙/土配比坪床上的生长适应性

The Adaptability of Growth of Wild Festuca ovina L. and Koeleria cristata L. on Different Soil/Sand Ratio Turf-bed

为了筛选出能够在含沙量较高的土壤上生长的内蒙古乡土草坪草种,2009年6~9月用盆栽试验研究了4种不同土壤配比对野生羊茅和[艹洽]草草坪的盖度、分蘖数、生物量等指标的影响。结果表明：（1）野生羊茅和[艹洽]草都具有良好的抗沙性;在任一土壤处理下,[艹洽]草草坪的盖度、地下生物量、根冠比都高于羊茅草坪,而其分蘖数、地上生物量低于羊茅草坪。（2）在30%耕作土＋70%沙的土壤配比下羊茅草坪的生长特征优于其他土壤配比,[艹洽]草草坪在100%耕作土下生长发育最好,当沙土超过50%后,含沙量的增加对其各个指标的影响不显著,说明羊茅耐土壤贫瘠、粗糙的能力要强于[艹洽]草,而洽艹草对土壤的适应范围大于羊茅。

For selecting Inner Mongolia native turfgrass which could grow on high sediment soil,pot cultivation was conducted to study the effects of four different soil treatments on coverage,tiller numbers and biomass of wild Festuca ovina and Koeleria cristata turf from June to September in 2009.The results showed that：（1）Both wild Festuca ovina and Koeleria cristata turf had good characteristics in adapting to the sandy soil.Under any soil treatments,coverage,underground biomass and root/shoot ratio of Koeleria cristata turf was higher than that of Festuca ovina turf,while tiller numbers and aboveground biomass was reduced.（2）Under 30% agricultural soil ＋70% sand soil treatment,tiller numbers,coverage and biomass of Festuca ovina turf were larger than other soil treatments.Under 100% agricultural soil treatment Koeleria cristata turf grew best.When sand content was more than 50%,the effect of the index had no significant differences as sand content increasing.The result showed that the ability of Festuca ovina to tolerant the poor and rough soil was better than Koeleria cristata.The adaptive range of the soil of Koeleria cristata was wider than Festuca ovina.