雷竹引种后地下鞭生长规律研究

雷竹引各后地下鞭生长发育实地调查结果表明：雷竹地下鞭生长发育和分布存在空间规律性变化。鞭龄及土层深度对鞭长的影响显著。鞭龄对壮芽数及出笋芽数影响达极显著水平。竹鞭节位第6－20节段上出笋最多，竹鞭节位对出笋芽数的影响达显著性水平。竹鞭生长方向以顺坡向下的最多。跳鞭露出地面的部分，竹鞭直径细小且节密，无发笋现象，应及时覆土。母竹地径与竹鞭直径，及竹眉高直径与竹笋地径之间存在相关关系。应适当地挖掘鞭梢以促进岔鞭数目，同进竹鞭长度以1－2m为宜。松土、除草、施肥和适宜厚度的覆盖有利于鞭的生长和单位面积笋的产量。

Studies on the Bamboo Rhizome Growth after Introduction of Phyllostachys praecon f. preveynalis

An runestigation on bamboo rhizome growth of Phyllostachys praecon f. preveynalis after introduction was carried out. The result shows that rhizome growth and their distribution in soil are reasonable. The effect of the rhizome age and depth of soil on the rhizome length are obvious, whereas the effects of the rhizome age on the numbers of full buds and shoots are extremely obvious. The number of shoots located at 6～20th node of rhizome is the largest. The effect of the node location of rhizome on the number of shoots is obvious. The main direction of the rhizome growth is down the hillside. As for the above rhizome, its diameter is small, length between its nodes is short, and no shoots grow on it. There is a inverse relationship between the stem diameter on the surface of the earth and the diameter of rhizome, and between the diameter of stem at 1.6 m and shoot diameter on the surface of the earth. In order to increase the number of rhizomes, we should cut off the top bud of rhizome, and keep the rhizome length to 1～2 m. Loosing the soil, killing the grass, fertilizing and reasonable cover thickness are good for the growth of rhizome and yield of shoots.