飞机喷洒Bt粉剂防治天然胡杨林春尺蠖技术

应用Y-5B型飞机低量喷洒16 000 IU/mg的Bt可湿性粉剂防治天然胡杨林春尺蠖,用量为1 500 g/hm2和1 200 g/hm2。结果表明两种剂量都具有高效持效的特点,1 200 g/hm2可使虫口减退率达到97%,有效地减轻了春尺蠖对新疆天然胡杨林的危害,防治成本有所下降。     

覆膜技术对栓皮栎成活与生长的影响

连续2年(2003年秋-2005年秋)通过覆膜对栓皮栎造林成活与生长的影响进行调查分析发现,成活率由59％提高到96％;高度年均生长量提高了21．5 cm,地径年均生长量提高了1．5 mm。分析其原因是:覆膜可以起到保墒、保温的作用,并且抑制了幼树周围杂草的生长。     

国槐主要害虫的发生与防治

国槐原产我国,由于其具有生长快、寿命长、树姿优美、遮荫面积大,耐干旱、抗逆性强等特性,已成为我国很多地区的庭荫树和行道树,在北京被尊为市树.     

新型软木原料栓皮槠的采剥,再生试验及理化性能研究

对栓皮槠与栓皮烁树初再生皮在采剥难易、含皮量、再生速度、再生率及其栓皮在外观、质量、化学组成的差异及地理差异等方面进行的对照试验结果表明：栓皮槠栓皮质量好，再生能力强，产皮厚，剥皮工效高，经济效益好，是优良栓皮树种，可用来改造我国的栓皮烁林。     

木橑尺蠖在庐山的发生及其防治

木橑足蠖在庐山为害43科93种植物．报道了它的生活史和生活习性．灯诱和人工捕捉成虫．人工挖蛹．双及用1：2500-3000倍敌杀死水液或1：800倍辛硫磷水液防治幼虫，效果在90％以上。     

6个栓皮栎种源种子形态及其幼苗生长的比较

[Objective]To compare the differences of seed morphological characters among provinces of Quercus variabilis Bl.,and explore the adaptive growth status of seedlings growing in the central distribution area. [Method]The seeds of 6 Q. variabilis provenances from six provinceswerecollected, and the seedlings were cultivated and transplanted to experimental field in the centre of natural distribution range (Wuhan Jiufeng National Forest Park), then the seed morphology and one-year seedling growth traitswere surveyed. [Result](1)There were significantor extremely significantdifferences among provenances in seed length, seed width, seed length/width ratio and 100-seed mass, the order of seed length among provenances was Beijing Provenance (22.28 mm),Hubei Provenance (22.10 mm), He'nan Provenance (20.80 mm), Shaanxi Provenance (19.57 mm), Yunnan Provenance (18.93 mm)and Liaoning Provenance (18.81 mm), the seed width of Beijing Provenance (19.71 mm) and Hubei Provenance (19.16 mm) was higher than that of the others, the seed length/width ratio of He'nan Provenance (1.38) was extremely significantly higher than that of the others; (2)There were significant or extremely significant differences among provenances in seedling height, ground diameter, leaf number, branching number and seedling height/ground diameter, the Beijing Provenance and Hubei Provenance were better in seedling height and leaf number, which were respectively 19.54 cm and 20.26 cm, 8.32 leaves and 9.50 leaves; (3)A decreasing trend with time for seedling growth traits among provenances was found; (4)There was a positive relationship between seed morphological characters and seedling growth traits except seed length/width ratio; the leaf number was significantly related to ground diameter and branching number and the seedling height and leaf number were closely related to the seed morphological characters; (5)It showed a decreasing trend with the growth time in the relationship between seedling growth traits and 100-seed mass. [Conclusion]The seedlings of Beijing Provenance and Hubei Provenance grew better in the experimental field which might be related to their larger seed mass, and the Yunnan Provenance in the south margin and the Liaoning Provenance in the north margin of distribution area of Q. variabilis grew weaker than the provenances in the centre of distribution area.With the effect of climate change, provenances in the margin of distribution area may lose in the community competition in the seedling stage if it cannot take advantage of its dispersal and settlement and affected by the disadvantage of growth and competition, so that the distribution and population renewal would surely be affected.     

栓皮栎软木化学除杂技术研究北大核心

该研究以产自我国陕西秦巴山区的栓皮栎软木初生皮为原材料,对栓皮栎软木化学除杂技术进行了探索。试验发现,将软木块浸泡于5.82mol/L盐酸溶液与6.12mol/L硫酸溶液体积比4:3的混合溶液中,并在恒温水浴60℃条件下浸泡20h的处理条件下软木除杂效果较优;通过扫描电镜对处理前后软木微观构造的对比观察,发现杂质细胞由之前的排列整齐变为杂乱,细胞间隙增大,且质地变疏松,易被剥离,而软木细胞未发生明显变化,表明此除杂工艺能够对软木产生明显的除杂效果。     

浅谈多季养蚕模式下的桑树管理

<正>随着我国工业化、城镇化进程的加速,农村劳动力流失情况日益突出,为了稳定和发展蚕桑生产,必须增加每户蚕农的养蚕量,提高蚕茧质量,从而增加其养蚕收入。为此,我县于2013年起,试验并逐步推广多批次滚动养蚕。养蚕布局的调整,对桑树管理、劳动力时空分布、蚕茧收烘等方面提出了新的要求,两年的实践证明,加强桑树栽培管理,均衡各季产叶量,特别是增加春季和晚秋季的养蚕量是多批次滚动养蚕增加蚕农收入的重要因素。为此,我县选用萌芽开叶早,     

脱水对栓皮栎种子基因表达的影响

以收集于同一栓皮栎优良单株种子为试验材料,通过脱水和萌发试验确定脱水敏感关键时期,对未脱水(CK)和脱水敏感关键时期种子进行转录组测序分析,探究种子脱水过程中基因表达变化,挖掘与种子脱水敏感性相关的基因。结果表明：栓皮栎种子含水量与萌发率间呈极显著正相关。种子萌发临界含水量在28.20%(T2)左右,致死含水量在17.79%(T11)左右。通过差异基因表达分析,在比较组T2和CK,T11和T2和T11和CK中分别获得4 405、4 066和5 907个差异表达基因。这些差异表达基因分别被富集到生物学过程,分子功能和细胞组分3个功能类别以及内质网中蛋白质加工与植物激素信号传导等代谢通路中。其中,MYB108、MYB1R1、ERF1B、UNE10、CRF4、CML11、JAZ、MYC2、TGA等基因可能调控种子脱水过程中活性氧的产生与清除机制,以及胁迫信号的传导等过程,进而在种子对脱水的响应中发挥重要调控作用。     

河北省蒙古栎、栓皮栎国家林木种质资源库建设探讨

蒙古栎、栓皮栎作为重要的良木树种,对于河北省园林绿化具有重要的作用.该文介绍了蒙古栎、栓皮栎国家林木种质资源库现状和开展的主要工作,分析了种子资源库建设存在的问题,针对资源库未来的发展提出了相应的对策建议,以期为河北省蒙古栎、栓皮栎国家林木培育和种植提供参考.