假叶树的组织培养

在假叶树组织培养过程中,各种激素的质量浓度;在愈伤组织阶段,细胞分裂素ＺＴ以１．０、生长素ＮＡＡ以０．３为宜;分化阶段,细胞分裂素ＢＡ以１．０或ＺＴ以０．５、生长素ＮＡＡ以０．１为宜;生根阶段以０．３％活性炭,不加任何激素重要有效果最好。     

Characterizing long-term forest disturbance history and its drivers in the Ning-Zhen Mountains,Jiangsu Province of eastern China using yearly Landsat observations (1987–2011)

Forest losses or gains have long been recognized as critical processes modulating the carbon flux between the biosphere and the atmosphere. Timely, accurate and spatially explicit information on forest disturbance and recovery history is required for assessing the effectiveness of existing forest management. The major objectives of our research focused on testing the mapping efficacy of the vegetation change tracker (VCT) model over a forested area in China. We used a new version of VCT algorithm built upon the Landsat time series stacks (LTSS). The LTSS consisted of yearly image acquisitions to map forest disturbance history from 1987 to 2011 over the Ning-Zhen Mountains, Jiangsu Province of east China. The LTSS consisted of TM and ETM+ scenes with different projections due to distinct data sources (Beijing remote sensing ground station and the USGS EROS Center). The validation results of the disturbance year maps showed that most spatial agreement measures ranged from 70 to 86 %, comparable with the VCT accuracies reported for many places in USA. Very low accuracies were identified in 1995 (38.3 %) and 1992 (56.2 %) in the current analysis. These resulted from the insensitivity of the VCT algorithm to detect low intensity disturbances and also from the mis-registration errors of the image pairs. Major forest disturbance types existing in our study area were identified as agricultural expansion (39.8 %), urbanization (24.9 %), forest management practice (19.3 %), and mining (12.8 %). In general, there was a gradual decreasing trend in forest cover throughout this region, caused principally by China’s economic, demographic, environmental and political policies and decisions, as well as some weather events. While VCT has largely been used to assess long term changes and trends in the USA, it has great potential for assessing landscape level change elsewhere throughout the world.     

江苏营造林管理系统的研建与应用

根据生产需要,用面向对象编程语言Delphi和数据库技术的设计思想和实现方法,开发出了江苏省营造林管理系统.实践表明：使用该系统可有效地减轻手工工作量,提高劳动生产力,把统计过程中的各种误差或错误降低到最小程度,大大提高了江苏营造林管理信息的标准化、自动化和科学化水平.     

草地与草业

本文介绍了草地的概念、草地的经济和生态价值、草业包含的内容以及生态草建设在草业中的位置。     

欧洲赤松引种试验初报

树木引种驯化在林业发展中,始终具有较强的魅力。这是由于一个优良的树种,理性地引入一个地区后,所带来的良性变化决定的。欧洲赤松生长快、抗性强、耐干旱瘠薄、耐高寒。我们从80代即开始了国内外松属植物的引种工作,其中欧洲赤松(pinusdensiflorasieb·etzucc)是较为成功的一例。本文实录了20余年赤松引种驯化情况,以供同行们参考。     

松花粉工艺处理对防控印度谷螟的效果

印度谷螟是松花粉的重要仓储害虫,为有效控制仓储害虫,确保产品质量安全,进行了干燥、过筛、灭菌及破壁等松花粉产品主要工艺过程防控印度谷螟的试验。结果表明:在松花粉产品加工流程中,采用180目以上筛网过筛,49 ℃、120 min加温干燥,12 kGy ⁶⁰Coγ辐照灭菌,机械破壁或压片成型,7 g·m^-3、6.5 h硫酰氟熏蒸或-8 ℃、24 h冷冻贮藏等任一工艺处理,都能防杀印度谷螟卵或幼虫。各措施组合应用能有效防控印度谷螟侵入或危害,且经济、实用和安全。     

马尾松不同抚育方式对林地生产的影响

对马尾松幼林采用全面劈草、全面劈草局部松土、全面除草松土3种抚育方式对林地植被生长、表层土壤变化及幼林生长的影响进行研究,结果表明:植被覆盖率、植被枯落物随抚育强度提高而降低,而土壤侵蚀则随抚育强度提高而增强,马尾松幼林生长与抚育强度提高成正比.在南方马尾松集约经营的山区,宜提倡带状抚育,既可促进幼林生长,又能维护地力.     

长林系列油茶籽含油率和脂肪酸组成分析研究

对长林系列11个油茶良种油茶籽含油率进行了测定,并采用GC/MS分析油茶籽油的脂肪酸组成结果表明：油茶籽含油率大部分集中在30%～45%,平均含油率为37.94%;含油率最高为46.41%,最低为22.80%。油茶籽油脂肪酸主要由油酸、亚油酸、棕榈酸、硬脂酸等9种脂肪酸组成;油酸含量为71%～78.96%,均值为74.82%,标准偏差为2.72%。亚油酸含量在7.02%～14.3%,均值为11.49%,标准偏差为2.59%。棕榈酸含量在8.75%～11.80%,均值为9.94%,标准偏差为0.98%;硬脂酸含量在1.66%～3.79%,均值为2.57%,标准偏差为0.71%。     

不同浓度铅处理对木本植物种子发芽的影响

以皂角、刺槐为试验材料,通过不同浓度铅处理,研究了其对种子萌发的影响。结果表明：随着铅离子浓度的增加,植物种子的发芽率下降。     

湖南栗瘿蜂的寄生蜂种类及保护利用措施

在湖南板栗瘿蜂Dryocosmus kuriphilus(Yasumatus)和麻栎瘿蜂Andricus sp．中共采集到寄生蜂14种。将其中比较重要的8种进行了形态描述,并附采集时间、地点和寄主。同时根据湖南具体情况对如何保护利用这些寄生蜂提出了4点措施。