Influence of excessive biotic pressure and fire on culm diameter, density flux and seed production in Melocanna baccifera stands

A study was conducted to investigate culms density and size, seed size and production rate in Melocanna baccifera stands disturbed by biotic pressure and fire. Results revealed that culms density, number and size of seeds produced in the bamboo stands were significantly affected by frequent fire and excessive biotic pressure （collection of young shoots for vegetables and mature culms）. The culm density and seed production rate decreased significantly in the stand subjected to excessive biotic pressure. An increasing exposure of culms to sun light was responsible for the above decrease. Seed production rate significantly increased in case of culms subjected to fire in comparison to the control. It indicated that fire stimulated the seed production in M. baccifera stand.

梨竹有性繁殖试验研究

于2005年6-7月在广西林业科学研究院苗圃和竹种园利用梨竹（Melocanna baccifera（Roxb.）Kurz）的果实直接播种育苗,设置果实重量、播种时间、播种基质等试验因素,研究其对梨竹果实发芽率、成活率以及对竹苗根、竿、叶等器官生长的影响。试验结果表明果实重与发芽率、竹苗地径、高生长、出根量、叶片大小等成正比例关系;播种早比播种迟成活率提高20%;人工改善水分、湿度和光照等条件,育苗成活率比天然更新提高40%,更有利于梨竹林的恢复。

小梨竹核型分析

本研究采用酶解去壁低渗法对小梨竹(Melocanna humilis Kurz)的体细胞染色体进行核型分析。研究结果表明:小梨竹染色体数为2n=2×=72,全组染色体总的绝对长度为99.87μm,平均绝对长度为2.78μm,属于小染色体类型;其核型公式为2n=72=28m+8sm(SAT),染色体相对长度组成为2n=72=4L+12M2+17M1+3S,染色体组型为"2A"型,属于原始类型。这一细胞学结果不仅填补了小梨竹相关理论空白,而且可作为小梨竹与其它种的区分依据,同时也为竹类植物系统分类研究提供一定的参考。

印度喜马拉亚东部3个经济竹种的分布、生长和生产力(英文)

对印度喜马拉亚东部3个州的经济竹种的分布、生长和生产力进行了研究。在梅加拉亚那邦,发现了牡竹属、巴苦竹和梨竹属3个经济竹种。巴苦竹是在米佐拉姆的记载,方竹属和牡竹属是在锡金记载的笋用竹。所有竹种除野生外均在庭院中栽培。据观察,竹子的产量与海拔的变化密切相关,巴苦竹最大产量出现在低海拔的而非高海拔的林分中。牡竹在梅加拉亚邦每丛生长69株,每公顷1839株,大大高于庭院种植的低海拔株数(每丛16株,每公顷303株)。而在天然林中,在高海拔总株数为每丛29株,每公顷1186株,在低海拔中每丛22株,每公顷178株。