几种暖季型草坪草的抗寒力指标测定及其在北京地区越冬可能性评价

Determination of Cold Hardiness of Several Warm-Season Turfgrasses and Assessment on Their Possibility of Winter Survival in Beijing

以冷季型草坪草纳苏草地早熟禾(Pao pratensis)为对照,用冷冻返青法和电解质渗漏法测定了四种暖季型草坪草(切尼普通狗牙根草 Cynodon dactylon、马尼拉草 Zoysia matrella、日本结缕草 ZoysiaJaponica 和野牛草 Buchloe dactyloides)在冬季最大抗寒能力,获得了各草种的临界致死温度指标:草地早熟禾为-19.5℃～-22℃,野牛草为-18.5℃左右,日本结缕草为-10.5℃～-11.5℃,狗牙根草和马尼拉草为-8℃～-9℃。同时,结合气象资料对各草种在北京地区越冬的可能性进行了分析。

Both electrolyte leakage and regrowth tests were used to estimate the lethal low temperature(LT50)of four kinds of warm-season turfgrasses(Chenne common bermudagrass Cynodon dactylon,manilagrass Zoysia matrella,Japanese lawngrass Zoysia japonica,Bufflo- grass Buchloe dactyloides)with Nassau K.Bluegrass(Pao pratensis),a kind of cool-season turfgrasses,taking as the contrast variety.The main results are as follows:the LT50 of P. pratensis,-19.0～-22.0℃;B.dactyloides,-18.5℃;Z.japonica,-10.5～-11.5 ℃;Z.matrella and C.dactylon,-8.0～-9.0℃.Based on the test result above and the weather record,the possibility of winter survival of each variety of turfgrass in Beijing were also analyzed.