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一、协作计划完成情况和体会我区先后参加了桉树单株选优、建立母树林、种子园、培育新品种、引种、肥效和密度七个协作试验项目.种性不稳定,造林后林分严重分化,前期速生后期低产,是桉树的一个特点,尤其是在见种就采,有苗就种的时期,矛盾更为突出。为了提高单产与木材质量,首先必须进行种子革命.因此,于1975年秋,在全区的人工实生桉林内,开展了桉树选优的群众性运动。计在山口、钦廉、北海、东门、巨黎、群力、维都、石塘等15个场所共同努力下,共选出优树114株.其中:柠檬桉42株、窿缘桉36株、野桉类36株。采用五株优势木对比法选优。选优后经过复评.选优标准见下表。选优并非良种的终点,而仅是种子革命的开端.为鉴别优
First, the cooperation plan to complete the situation and experience I have participated in the district Eucalyptus single plant selection, the establishment of mother trees, seed orchard, cultivate new varieties, introduction, fertilizer efficiency and density of seven collaborative pilot projects. Instability instability after afforestation Severe differentiation, low yield early late period, is a characteristic of eucalyptus, especially in the see the mining, there seedling species, the conflict is even more prominent. In order to improve the yield and the quality of the wood, we must first carry out the seed revolution, so in the autumn of 1975, Eucalyptus trees were selected for mass movement in the artificial eucalyptus forest in the region. In total, 114 elm trees were selected under the joint efforts of 15 sites including Shankou, Qinlian, Beihai, Dongmen, Juri, Qunli, Weidu and Shitang, among which 42 were lemon eucalyptus, 36 36 strains of eucalyptus. Using five superior wood contrast method optimization. Selected after the re-evaluation. Selection is not the end of the elite, but only the beginning of the seed revolution