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引言很多草地,特别是在秋天有这样一个现象,就是出现牧草凋萎或枯草倒伏在地表。大多数凋萎或死亡的牧草,既有植株已脱离地表但与一些根仍有联系的翻起草皮(Ga-lightly,1980),也有脱离原植株折断落在地表的枝条(Hughes and Jackson,1974)。多年生黑麦草(Lolium perenne)地上枝是主茎的节间伸长而离地表的节上发育而成的。夏初草层在放牧的再生长中,因适度至重度放牧常常抑制主茎的伸长。
Introduction Many grasslands, especially in the fall, have the phenomenon that forage or hay fall on the surface. Most faded or dead forages, both pasture (Ga-lightly, 1980), which have been detached from the surface but still associated with some roots, and shoots that have fallen off the ground from the original plant (Hughes and Jackson, 1974 ). Perennial ryegrass (Lolium perenne) aboveground branches of the main stem of the internodal elongation and development from the surface of the festival. Grassland in summer re-growth in grazing, due to moderate to severe grazing often inhibit the main stem elongation.