京郊果园种植几种优质果园草覆盖越冬技术研究

针对白三叶Trifolium repens、杂三叶T.hybridum、鸭茅Dactylis glomerata、百脉根Lotus corniculatus等几种优质果园草在京郊果园难以安全越冬的问题。试验采用覆膜、覆草、浅覆土3种覆盖越冬技术对果园草进行覆盖越冬效果的比较研究。结果表明，覆膜、覆草、浅覆土3种覆盖技术较对照均能显著提早各果园草品种的返青时间，显著提高越冬率和覆盖度。覆膜区的果园草品种较浅覆土和对照区分别提早返青13和20 d以上，越冬率平均分别提高21.8%和60.8%，返青生长到4月1日时草群覆盖度分别提高41%和51.3%，而覆草区的果园草品种较浅覆土和对照区分别提早返青4和8 d以上，越冬率平均分别提高16%和45.3%，返青生长到4月1日时草群覆盖度分别提高14%和22.7%。几种果园草品种覆盖越冬效果的具体表现为覆膜＞覆草＞浅覆土＞对照，但在具体实施中虽覆膜是一种效果最为明显的果园草品种覆盖技术，而覆草技术（干草535 g/m2、厚度约5 cm）更为环保、经济、实用。

Study on the cover technology for the overwintering of high-quality orchard grasses in Beijing

In order to resolve the overwintering problem of the several high-quality orchard grasses,such as Trifolium repens,T.hybridum,Lotus corniculatus and Dactylis glomerata,the cover techniques were studied in the suburbs of Beijing by using three cover treatments(mulching,straw cover,shallow soil cover).The results showed that three treatments were effective for the orchard grass regreening and significantly increased the overwintering percentage.The turning green period of orchard grasses under mulching treatm...