BA与NAA对红宝石、箭叶、心叶3种喜林芋试管苗增殖和生长的影响

对红宝石喜林芋、箭叶喜林芋和心叶喜林芋组织培养研究的结果表明：ＢＡ 与ＮＡＡ 对３ 种喜林芋试管苗的增殖和生长效应明显。在相同培养条件下,试管内形成组织团块能力为箭叶喜林芋＞ 心叶喜林芋＞ 红宝石喜林芋;分化芽能力（ 芽苗增殖倍数） 为红宝石喜林芋＞ 箭叶喜林芋＞ 心叶喜林芋;芽高生长为箭叶喜林芋＞ 心叶喜林芋＞ 红宝石喜林芋;生根所需时间为心叶喜林芋＞ 红宝石喜林芋＞ 箭叶喜林芋;２０ ｄ 芽苗生根率为箭叶喜林芋＞ 红宝石喜林芋＞ 心叶喜林芋。     

741杨试管苗培育的研究

741杨是用有性杂交法选育出的一个优良毛白杨杂种无性系。用组培法经正交试验,获得了春季芽继代培养基成份的最佳组合:1/2G.MS+2.5%+6-BA0.5+KT0.1+IBA0.03,分化率为85%。芽继代培养基加入植物生长调节剂的浓度应随季节变化而改变。对生根培养基的研究发现,生根基质用琼脂比蛭石效果好。并提出了一套较成熟的试管苗移栽到大田的技术措施。     

不同基质对大樱桃试管苗生长的影响

利用锯木屑、珍珠岩、细沙、蛭石、草炭、有机肥、壤土等按照一定体积比组成配合基质，用于大樱桃试管苗移栽。研究结果表明，基质对试管苗成活率有明显影响；不同基质对大樱桃试管苗株高、根长、叶片数和冠径影响显著，而对茎粗无显著影响；采用“壮苗指数”法和“综合评分”法对不同基质的应用效果进行评估，结果表明，基质T5、T6和T3均适用于大樱桃试管苗移栽，其中以T5(8份锯木屑，1份珍珠岩，1份草炭的混合基质)最佳。     

观赏植物试管苗无土栽培营养技术的研究

观赏植物花叶芋和金苞花试管苗的无土栽培试验结果表明：无土栽培花叶芋基质以蛭石＋砂为好；金苞花应选用蛭石＋砂、珍珠岩＋煤渣、煤渣。营养液供试质量分数对花叶芋的生长反应不敏感；金苞花开花最适营养液的质量分数为５‰。     

延长苹果试管苗保存时间的研究

试验研究了4个苹果品种的试管苗在室温及培养中添加生长延缓剂B9、PP333、CCC，倍量琼脂或倍量蔗糖条件下的保存情况。结果表明，倍量蔗糖对延长苹果试管苗保存时间是重要物质，倍量琼脂和CCC 50mg/L也能延长保存时间，但效果不如蔗糖。不同基因型应采用不同的保存方法。要保存的材料应在最适季节转换，以利于长期保存。     

香蕉对疏花石斛试管苗生长的影响

研究了香蕉3种添加方式（捣碎物、上清液、沉淀物）及其相应浓度梯度对疏花石斛试管苗生长的影响。结果表明,1/2MS附加浓度为10%香蕉上清液时对疏花石斛试管苗生长的促进作用最佳,而且试管苗可溶性糖含量也最高。     

影响樱桃试管苗玻璃化的因素与克服措施

以春季、尚未木质化的樱桃茎尖或茎段为外植体,探讨了樱桃的初代培养和继代培养过程中的玻璃化现象,试验结果表明,通过降低水势、减少培养基中外源激素的含量(尤其是BA、GA的含量),可以有效减轻试管苗的玻璃化。     

多效唑及光温条件对丝石竹试管苗生长的影响

试验结果表明：多效唑对丝石竹试轩有明显的矮化和延缓生长作用。它与生长素（ＮＡＡ）配合使用,能加快成苗速度,且其苗健壮,与６－ＢＡ配合使用可有效提高分化芽的增殖系数,分化芽粗壮,叶色深绿移栽成活率高。光照和温度对丝石竹试管苗壮苗生长也有明显影响,光照度大,光照时间长,温度低,具有明显壮苗作用,移栽成活率高。     

布鲁诺猕猴桃结实期果实生长与营养成分的变化

对布鲁诺猕猴桃在浙江北部地区的果实形态变化及主要营养成分的变化规律研究结果表明：布鲁诺猕猴桃果实体积与鲜质量变化曲线为“双S”型,果实发育期主要营养成分(有机酸、蛋白质、碳水化合物、维生素C等)含量呈规律性变化。     

The effects of species mixture on the growth and yield of mid-rotation mixed stands of Scots pine and silver birch

The effect of tree species mixture on stand volume yield and on tree-species-specific diameter and height growth rates were analysed in managed mixed stands of Scots pine (Pinus sylvestris L.) and silver birch (Betula pendula Ehrn.).Data were obtained from 14 repeatedly measured stands located in Southern Finland on mineral soil sites with varying admixture of Scots pine and silver birch. Statistical analysis was carried out for studying the effect of species mixture on the development of stand characteristics. For the analysis, the plots were categorised into three groups (plot types) according to the species dominance. In order to analyse species-specific growth rates, individual-tree mixed linear growth models for tree diameter and height growth were developed for both tree species.The results clearly show that the yield of the managed mid-rotation, mixed stands was greater for stands dominated by Scots pine than for stands dominated by birch, and the stand volume increment decreased with an increasing proportion of silver birch. Analysis of diameter and height growth by tree species revealed that the main reason for this pattern is the negative impact of birch competition on the growth of pine trees. The increase in diameter of pine was clearly hampered if the proportion of birch was high. An abundance of birch also slightly decreased the growth in height of Scots pine, although the effect was less than on diameter growth. Species mixture did not affect the diameter growth of birch but did have a significant effect on height development. Height growth of birch was considerably greater in pine-dominated stands than in birch-dominated stands. In pine-dominated mixed stands, the height growth of birch was quite close to that of dominant pine trees, and birches can endure in competition with pines for light.The results apply for even-aged and single-storey managed stands, where stocking density and structure are controlled with pre-commercial and commercial thinnings. The results are not applicable to unmanaged mixed stands undergoing self-thinning. This study provides new information on mixed stands from a silvicultural perspective, which can be applied in decisions involving the management of mixed stands.     

贮藏保鲜方法与再加工对毛竹笋营养成分的影响*

经试验分析表明，毛竹笋不同贮藏保鲜方法及再加工对笋产品的粗蛋白质、１５种氨基酸及矿质元素等营养成分有影响，其中用盐汁（笋）法和用亚硫酸盐保鲜的笋，粗蛋白质及氨基酸含量较保鲜前明显减少，而用清水笋罐藏及用ＳＭ保鲜剂保鲜的熟笋，氨基酸含量变化较小，而且保鲜笋的色泽正常、无异味，各项检测指标符合食品卫生标准，是我国目前较好的贮藏保鲜方法。     

人工复合基质对微型盆栽月季生长发育影响的研究

比较系统地研究了7种不同无土人工复合基质对微型盆栽月季(Rosa hybrida ‘Miniature Pink’)生长与发育的影响。结果表明，100％泥炭，70％泥炭 30％珍珠岩，70％珍珠岩 30％泥炭这3种基质比较理想，其对微型盆栽月季的株高、枝叶鲜样质量及干样质量、叶面积、平均根长、最长根长、根鲜样质量及干样质量、现蕾日期、开花日期、花朵直径等均表现为显著的促进作用；微型盆栽月季无土基质的优化物理性状为：容重O．12～0．19g／cm^3，比重1．6～1．9g／cm^3，含水量(风干基质)6％～16％，总孔隙度90％～94％。     

Influences of the Populus deltoids seedlings treated with exogenous methyl jasmonate on the growth and development of Lymantria dispar larvae

Introduction The interplant signal transduction has been hypothesized for many years (Baldwin and Schultz 1983; Rhoades 1983). It has been found that the resistance to insects is induced not only in damaged plants but also in the neighboring undamaged ind…     

林业科研成果转化的制约因素及提高成果转化效率措施初探

从制约林业科研成果转化效率的因素分析,对提高林业科研成果转化效率提出建议,并对科研成果推广模式进行探讨.     

气候和立地条件对板栗生长结果的影响

对影响板栗生长结果的主要因素———气候和立地条件进行分析和阐述。明确了依气候差异及板栗生物学特性划分为六个产区,并在同样的气候条件下,立地条件对板栗产量和品质起更重要的作用。板栗适宜种植在花岗岩、片麻岩发育的棕壤和淋溶褐土上;土壤pH值、土壤有机质和营养元素含量及质地等理化性质与条件是影响板栗产量的因素,而铁、锰、硼等微量元素的含量则是影响板栗品质的重要因素。     

抚育间伐强度对华北落叶松中幼林林分生长的影响

以河北省木兰围场国有林场管理局克勒沟林场华北落叶松中幼林为研究对象,通过在林场选择样本区域和对照区域,对不同间伐强度下华北落叶松中幼林林分的生长状况进行分析,得到不同间伐强度下森林生长情况的具体参数,结果表明:通过对保留密度分别为400株/hm2、500株/hm2、600株/hm2、700株/hm2的8块样地和2块对照样地中林分的生长情况进行分析,得出各样地中林分的胸径、冠幅、树高、材积的大小除了树高外,都随着抚育强度的增加而呈现显著递增的趋势;通过与对照地做对比得出,在保留密度为500株/hm2时,材积增长率和蓄积增长率最大,但各样地中林分蓄积量小于对照样地中的蓄积量。