论青海地区育苗技术研究

培育苗木的一般流程,是从采种到种子发芽,再将已发芽种子移入容器。我们经常看到有部分的人工林呈现出成活率低、树形差,以及生长参差不齐等状况,这些问题很多是在幼苗期就存在了。因此,林业如能在此起始点上把好关,那么在后续的经营上就可以节省费用支出。青海地区属于高原气候,林业的育苗工作有自己的一系列特色。本文以云杉育苗为例,首先分析了林业育苗的一般思路,进而通过对青海地区云杉育苗试验的解析,阐明青海地区林业育苗技术要领。     

从化温泉松材线虫病综合防治示范区建设及其成效

2001～2005年,在严密监测疫情的基础上,对从化温泉松材线虫病综合防治示范区采取检疫封锁、清除病死树、应用引诱剂防治和树干打孔注药等综合防治措施,取得了良好的防治效果,发病松林面积由2001年开始发病时的573.3 hm2减少到2005年底的346.7 hm2,病死树数量由2001年的3 726株降低到2005年的239株,林间松墨天牛种群数量也大幅度下降.初步形成了一套较为完整的松材线虫病防治技术方法.     

广东省西樵山不同林分类型枯落物持水特性的研究

对广东省西樵山4种不同林分类型枯落物进行的研究表明：1）4种林分类型枯落物总储量大小顺序为：生态林〉景观林〉珍贵阔叶林〉常绿阔叶林;2）4种林分类型枯落物持水量、持水速率与浸水时间的动态变化规律基本相似。持水量随浸水时间增加呈上升趋势,但当浸泡8h之后,趋势变缓;不同林分类型持水速率在0～2h最快,在4～6h后逐渐减缓,6h后明显减缓;3）不同树种林下枯落物有效拦蓄率范围为160．05％～182．57％,有效拦蓄量大小顺序为：生态林〉景观林〉珍贵阔叶林〉常绿阔叶林,枯落物的拦蓄量与枯落物总储量和枯落物的持水特性相关。     

云南省森林火险等级预报系统

通过对云南省多个地方1950年到1980年气象测报数据进行分析,建立了适合云南省长期火险预报方法,实现了云南省长期森林火险趋势定量分析。对2006年云南省十六个地州市雨季气象资料进行计算,得到云南省各地州2007年森林长期火险等级,为防火工作提供科学依据。     

雷竹覆盖栽培失败原因浅析

总结了嵊州市雷竹覆盖栽培技术推广应用经验,对嵊州市的雷竹覆盖栽培失败典型事例进行了认真的剖析,提出了嵊州市雷竹覆盖栽培的对策与措施和4点建议。     

2-aryl benzofurans and their derivatives from seeds of Styrax macranthus

Two new 2-aryl benzofuran derivatives, 3-[7-methoxy-2-(3,4-methylenedioxyphenyl) benzofuran-5-yl]propyl 3-[7-methoxy-2-(3,4-methylenedioxyphenyl)benzofuran-5-yl]propanoate (1) and demethoxy egonol gentiobioside (2), were isolated from the aqueous ethanolic extract of the seeds of Styrax macranthus, together with 7-methoxy-2-(3,4-methylenedioxyphenyl)benzofuran-5-carbaldehyde, egonol, demethoxy egonol, demethyl egonol, egonol glucoside, egonol gentiobioside, egonol gentiotrioside, stigmasterol, 2,3-dihydroxypropyl tetracosoate, and daucosterol. Their structures were elucidated on the basis of spectral and chemical evidence.     

Function and value of water conservation in different age classes of Acacia mangium plantations

For this paper, we studied the water-holding capacity of canopy, vegetation layer under canopy and litter layer, the water-holding capacity and permeability of soil as well as their changes with growth of stands in Acacia mangium plantations of three different age classes (four-, seven-and 11-year-old). Results show that total water-holding above ground in the order of 11-year stand age (52.86 t/hm²)>seven-year stand age (41.90 t/hm²)>seven-year stand age (25.78 t/hm²), the increment tendency increased with stand age. Similar sequence also obtained on the water-holding capacity and permeation capacity of soil (0–40 cm). The total water-storage capacity both above ground and soil in four-year-old, seven-year-old and 11-year-old of A. mangium plantations were 2,023.0, 2,158.4 and 2,260.4 t/hm², respectively, and the all value of water conservation were 1,372.70, 1,474.42 and 1,549.91 yuan (RMB)/hm², respectively. Therefore, A. mangium plantation had a good ability to modify soil structure and good water conservation function. __________ Translated from Journal of Soil and Water Conservation, 2006, 20(5): 5–8, 27 [译自: 水土保持学报]     

Evaluation of the level of threat and protective classification of the vegetation of Makehe Forest in Sanjiangyuan Nature Reserve, west China

After investigating and studying the vegetation, we have established that Makehe Forest, in Sanjiangyuan Nature Reserve, Qinghai Province, is host to a total of 364 different species, representing 173 “genera” in 55 different vegetative families. We propose five quantifiable indices for evaluating the level of threat to these plants: 1) the distribution frequency of the “line transect”; 2) the distribution frequency of sample plots; 3) the distribution density inside sample plots; 4) the existing abundance in the forest region; and 5) plant fidelity. The results show that there are two endangered species, six vulnerable species, 12 nearly threatened species and 344 safe species. The study tried to evaluate the urgency for conserving these plants, according to coefficients of closeness to disappearance, of genetic loss and of usefulness. Results also showed that the number of species of primary concern is two; of secondary concern, nine; of the third level, 23; and of least concern, 330 species. __________ Translated from Journal of Beijing Forestry University, 2006, 28(3): 20–25 [译自: 北京林业大学学报]     

龙血树的研究进展探讨

分析了龙血树的生态特征,从龙血树的繁殖方法、化学成分及药理研究、总RNA提取方法、血竭以及龙血树资源的利用与保护几个方面进行了探讨。     

广州古代名园海山仙馆造园艺术探析

通过历史文献研究和实地考察，分析广州古代名园海山仙馆的造园历史和构景要素，概述其造园思想、布局特点、建筑特色和植物配置特点。