白夹竹生物学特性观察

经观察，白夹竹鞭梢生长期６－１１月，鞭分布在土壤上层１－１５ｃｍ。鞭年生长１ｍ左右。笋芽３－４月萌动，笋从５月初长出地面至５月底不再出笋，历时２８天左右，每公顷大年笋１００００个左右，上林率为２９．５４％，虫退笋率为４３．９８％，自然 笋率为２６．４８％，上林率，大年高于小年，初期，盛期出笋高于末期出笋。竹笋从出土到长成幼竹，历时６０天左右，竹笋高生长，一般夜晚稍大于白天，笋箨有吐水同象，１９８５

Report of Biological Features of Phyllostachys nidularia

Phyllostachys nidularia: bamboo rhizome growing stagecommences from June. toNovember; bamboo rhizomes are distributed between 1 cm and 15 cm of the top layer of the soil ;bamboo rhizomes annual growth averages 1 m; shoot sprouting begins in March or April;shootscome out of the ground in early May and stop appearing above the ground in late May, spanning28 days ; shoot production averages 10 000 stems per ha in an on-year, 29. 54 percent of whichcan develop into adult bamboo culms, 43. 98 percent of which cannot grow intomaturity becauseof insect damage, and 26. 48 percent of which will be naturally degenerated. The culm rate of on-years is higher than off-years, and so is that of young and prime groves than old and senilegroves. It takes the shoots about 6o days to grow into young culms after their appearance abovethe ground. The shoots grow slightly more in height at night than in daylight. Shoot shucks maywater at times. Some culms at the grove border or roadside bloomed for three consecutive yearsfrom 1986 to 1988, but no culm was found wilting or dead. For mature culms, the larger the di-amter in breast high,the heavier and taller the culm.