俄罗斯杨(P.Russkii Jabl.)夏季扦插造林技术研究初报

大面积扦插造林在我国研究实用较少,美国在营造杨树纸浆工业原材料上,研究应用非常广泛,而夏季大面积扦插造林国内外未见报道。在克拉玛依"林纸一体化"项目上,短期内为了栽植6.67×104hm2(100万亩)纸浆工业原料林,新疆林科院开展了在特殊地区(风大、风多、干旱)全年造林技术研究与示范:2000年秋季造林66.67hm2,2001年春季造林800hm2,5月下旬至7月上旬用营养钵造林1333hm2,在6～8月用俄罗斯杨扦插造林368.7hm2,在土壤和灌溉条件较好的情况下,扦插造林成活率达73%～90%,效果很好,造林成本低、速度快,具有广泛的推广应用前景。

p27、JAB1在肝细胞肝癌的表达及意义

目的研究细胞调控蛋白p27及其相关分子JAB1在肝细胞肝癌(HCC)中的表达及意义。方法选取60例HCC及癌旁组织,10例肝血管瘤旁肝组织病例,采用免疫组化检测p27及JAB1的表达。结果p27主要在癌旁高表达,而JAB1蛋白在大部分HCC组织中的表达高于对应癌旁组织。JAB1在HCC中表达高于癌旁和血管瘤旁肝组织。p27在正常组织和癌旁组织的表达高于HCC组织。结论JAB1蛋白表达与p27呈负相关;JAB1可能是通过作用于p27,使其表达及代谢发生异常,导致细胞周期失控参与了HCC的发生和发展。

Analysis on the change of water potential of Populus euphratica Oliv.and P.Russkii Jabl under different irrigation volumes in temperate desert zone

The measurement of plant water potential is considered to be a direct approach to confirming the irrigation time in present irrigation systems.In this current study,two shelter forests species in the Junggar Basin (Central Asia),Populus euphratica and P.Russkii Jabl,were studied.We monitored leaf water potential (ψl),stem water potential (ψs) and soil water potential (ψsoil) under different irrigation conditions.The characteristics of the variation in leaf and stem water potential (ψl and ψs) of P.euphratica and P.Russkii Jabl,as well as the impact of soil water potential (ψsoil) on the leaf and stem water potential (ψl and ψs) under different irrigation conditions were discussed.Our results showed the following.(1) With increased irrigation,the intensity of drought stress on P.euphratica and P.Russkii Jabl decreased.(2) The intensity of drought stress experienced was less for P.Russkii Jabl than for P.euphratica under the same irrigation conditions.(3) The more intense the drought,the less sensitive was P.Russkii Jabl,but the more sensitive was P.euphratica,and vice versa.(4) For the P.euphratica community the soil water potential (Ψsoil) at 60 cm depth responded to variation in irrigation more strongly than at 30 and 90 cm depths.For the P.Russkii Jabl community the soil water potential (ψsoil) in the shallow surface layer responded to irrigation variation more strongly than that in deep layers.(5) In the event of relatively sufficient soil water,predawn stem water potential (ψpds) of plant was a reasonable indicator reflecting soil water potential (ψsoil).(6) The water demand of P.euphratica and P.Russkii Jabl shelter forests can be met with different irrigation policies:large volume and less frequency for P.euphratica but small volume and more frequency for P.Russkii Jabl.

不同水分处理下胡杨、俄罗斯杨光合特性的研究

【目的】以克拉玛依农业综合开发区防护林胡杨和俄罗斯杨为试材,探讨不同水分处理下不同树种叶片的光合特性。【方法】试验设置2种不同灌水量处理(50 m3/(667 m2.次)(处理一)和100 m3/(667 m2.次)(处理二)),对胡杨和俄罗斯杨进行光合特性指标测定。【结果】胡杨和俄罗斯杨的Pn、WUE、Gs日变化呈单峰或双峰曲线,在12:00时胡杨的Pn略微降低,Ci日变化呈近V字型曲线;在相同的试验条件下,胡杨的Pn、WUE、Gs、Tr、Ci均高于俄罗斯杨;比较不同水分处理下Ci-Pn、Ci-WUE、Ci-Gs、Ci-Tr光合曲线可知,胡杨、俄罗斯杨Pn、WUE随Ci的增加而增大,Gs和Tr值随Ci的增加而减小,差异显著。【结论】不同水分处理下,处理二两树种的气孔导度(Gs)、净光合速率(Pn)及蒸腾速率(Tr)高于处理一;处理二两树种的胞间CO2浓度(Ci)和水分利用效率(WUE)低于处理一;同一水分处理下胡杨能高效利用水分,同时又保持较高的光合能力,是抗旱能力较强的材料。

俄罗斯杨全生长季扦插造林幼苗生长与光合特征研究

【目的】不同扦插造林时间对俄罗斯杨幼苗生长与光合速率的影响。【方法】2009年4-8月进行俄罗斯杨扦插造林,调查各个月扦插苗的株高、地径和生物量,测定4、6月扦插苗生长期内的光合速率。【结果】4-8月扦插的俄罗斯杨幼苗生物量、株高和地径存在明显差异,4-8月扦插苗生长量依次降低;4月扦插苗光合速率与6月扦插相比,光合速率整体水平和最大值均大于6月扦插苗。【结论】在生长季内不同造林时间对俄罗斯杨扦插苗生长速率与光合有直接影响,扦插造林时间越早越有利于俄罗斯杨生长。

巨噬细胞移动抑制因子分子作用机制的研究进展

巨噬细胞移动抑制因子(MIF)是一种受下丘脑垂体控制的多功能细胞因子,由于与多种炎症性cPLA2、自体免疫性疾病及肿瘤等密切相关而受到极大关注。MIF的分子作用机制较为复杂,至今尚未完全阐明,国内外学者对此进行了大量研究,现就MIF分子作用机制的最新研究进展作一综述。