荔枝新品种‘观音绿’

 ‘观音绿’是通过实生选种的方法选育出的荔枝新品种。果实卵圆形,果肉脆嫩,单果质量21 ~ 25 g,可食率81.5%,焦核率95%以上,可溶性固形物18.5%。嫁接苗定植后3 年开始开花结果,4年生树平均株产可达7.5 kg。     

圣诞树组培苗移植试验

运用正交试验的方法研究不同炼苗时间、遮阳网遮光率、基质以及不同移植月份对圣诞树组培苗移植效果的影响.结果表明,炼苗时间为10 d、遮阳网遮光率为70%、基质为泥炭土:黄心土(2∶1)、移植月份为4月的处理圣诞树移植效果最好,成活率可达97.2%,苗高达11.1 cm.     

油茶5个物种苗期根结线虫病发生情况调查

对广西林科院油茶苗圃中普通油茶Camellia Oleifera、陆川油茶C.vietnamensis、南荣油茶C.nanyongensis、博白大果油茶C.gigantocarapa.和宛田红花油茶C.polyodonta共5个油茶物种的根结线虫病的发生情况进行调查,结果表明：普通油茶发病最为严重,病株率为100%,根结指数为53.8,通过鉴定,该线虫为南方根结线虫Meloidogyne incognita;南荣油茶和陆川油茶的发病情况较轻,病株率分别为23%和18%,根结指数分别为7.4和5.0;宛田红花油茶和博白大果油茶的病株率分别为4%和2%,根结指数分别为0.8和0.4,发病最轻。     

Covariances between morphological characteristics in bareroot Pinus sylvestris nursery stock

In this study an attempt was made to gather information on the relationships of morphological attributes of bareroot Pinus sylvestris seedlings in order to determine the possible use of these attributes for grading purposes. The covariance structure of different morphological variables was studied in commercially produced crops. From each selected batch of Scots pine seedlings, 300 seedlings were sampled, three successive living seedlings from each of the 100 systematically selected sampling points ("clusters"). Variance in the seedlings crop was described using a linear model: total covariance was divided into variance between batches, between clusters and between individual seedlings (error).

Most of the correlations between different plant parts were large and positive. Only needle length and root length seemed to vary independently of other “length”; variables. Within one batch, at the end of the growing season, height‐diameter was more clearly size‐independent than shoot‐root ratio. Needle biomass increased exponentially with seedling height but the smallest seedlings had relatively less needle biomass than the biggest seedlings. It is not necessary to include dry mass in the requirements for seedling quality since it correlates well and can be described with other variables that can be measured more easily. Of the principal components for morphological characteristics, the “stem”; component explained 69% of the height variation and 77% of the diameter variation, the “needle”; component explaining 79% of the variation in current needle length, and the “root”; component 58% of the variation in root length. Together the three components explain 76% of the total variance in the original crops.     

云龙县漕涧地区华山松育苗与造林技术研究

对华山松在云龙县漕涧地区的造林技术进行了研究,结果表明：在漕涧地区,华山松适宜于海拔2 000~2 800m的微酸性棕壤或黄棕壤,选用天然母树林采种并进行品质检验后育苗,100d出圃,雨季植苗造林,成活率达95%,且比直播造林节约种子1倍以上。     

赤霉素和氯化胆碱对尾叶桉幼苗生长指标的影响

采用盆栽方法,把赤霉素和氯化胆碱2种生长调节剂添加到富含微量元素的生物活性肥中,探讨这种复合制剂处理对尾叶桉幼苗生长的影响,为桉树生长调控和人工林精准化栽培提供理论依据。结果表明:喷施Lc复合药剂对尾叶桉幼苗的生长、根系的发育具有明显的促进作用。幼苗的株高、地径、生物量的增长分别比对照大36.7 cm、0.25 cm、3 g,经方差分析均有显著差异(P<0.05)。与对照相比,根冠比增加19.07%。Lc复合药剂处理后桉幼苗的分支数有所减少,但与对照相比没有显著差异(P>0.05)。此外,Lc复合药剂具有促使生物量优先分配到茎干的作用。     

珍贵树种顶果木的研究现状及趋势

通过对珍贵树种顶果木的相关研究进行综述,从生物特性、分布、种子、苗木培育、栽培技术以及木材材性、用途等方面进行总结分析,提出该树种的重点研究方向。     

浅谈如何提高造林质量

如何提高造林质量,严把总体规划关;严把整地质量关;严把苗木质量关;严把栽植质量关;严把管护质量关;严把抚育质量关。     

香椿两段式容器苗在喀斯特石漠化区域造林试验

为了检验香椿两段式容器苗在喀斯特石漠化区域造林的成活率、生长量表现情况。按试验设计,在贵州省金沙县马路乡犀牛村营造香椿容器苗示范林6.7hm2,作了与裸根苗造林的对照,对样方的成活株全面清点,求出成活率,用随机抽样抽取样株测量高生长量及径生长,对调查数据进行x2检验、T检验。结果表明,香椿两段式容器苗造林成活率、高生长量和径生长都显著优于裸根苗。为今后石漠化地区香椿造林开辟了新途径,亦是石漠化山区群众经济增长的一条捷径。     

小叶榄仁在汕头地区的引种评价

介绍了小叶榄仁的形态特征、生态学特性以及在汕头地区引种的生长表现。引种栽培结果表明:小叶榄仁生长和抗逆性表现良好,适合汕头等沿海地区作为庭园景观树种和行道树种,并总结了小叶榄仁的育苗及管理技术。