北京地区早园竹高生长规律及出笋长竹期的养护技术

本文以北京地区生长的早园竹（Phyllostachys propinqua）为研究对象，调查了早园竹的高度生长及竹林出笋规律。结果表明：竹笋的出笋时间不同，其成竹率也不同。出笋早的竹笋的成竹率较高；出笋越晚，竹笋的成竹率越低。据此可将早园竹的出笋期分为3个阶段：前期，中期，后期。3个阶段的时间大致相等，约为6-7d。前期笋的高生长期长、后期笋的高生长期短，它们高生长期的结束时间基本一致。早园竹的高生长遵循“慢一快一慢”规律，竹笋破土后14d和36d左右是高生长期的2个转折点，由此可将早园竹的高生长分为始期、盛期、末期3个阶段。早园竹的日最大高度生长量为51～75cm，占成竹平均高度的6．96％～9．04％。同时对早园竹出笋长竹期的养护技术进行了探讨。

Height Growth Rule and Tending Technologies for Shooting Period of Phyllostachys propinqua in Beijing Area

The height growth and shooting law of Phyllostachys propinqua in Beijing area, China were studied. The results showed that the rate of grown bamboo depended on shooting time. The rate was higher when shoots emerged earlier, and lower when it was late. So the shooting period of Ph. propinqua could be divided into 3 stages： the early, middle and late stage. Three stages had equal period of time with 6～7 days. Shoots of early stage grew relatively slow, so they would take more time to achieve their height growth;however, shoots at late stage grew relatively fast, and shorter time would be needed to achieve their height growth. Then they ended their height growth at almost the same time. The growth curve for clums was S-shape, and the 14th and the 36th day after shoot emerged from earth were two turning points of height growth period. Then three phases could be divided for height gowth period： beginning, flourishing and ending phase. Maximal growth amounts of Ph. propinqua in one day were 51～75 cm which accounted for 6.96%～9.04% of the average height bamboo. Finally, the tending and managements during the shooting period were discussed as well.