粘粒含量——夏季风的良好替代指标

通过对位于东亚季风区尾闾部位的沙沟剖面、东部半湿润区王官剖面、东部湿润区扣马剖面的气候代用指标的分析发现 ,黄土地层中 <5 μm的粘粒含量指标对各剖面中黄土-古土壤序列指示得比较清晰 ,可以较好地反映东亚夏季风的变化。对黄土地层中粘粒含量的测试及其环境意义分析以及与经典的东亚夏季风的替代指标———磁化率、红度指标 (a )的对比分析发现 ,粘粒含量指标的意义比较明确 ,适应范围更广 ,灵敏性也较高 ,是一比较可靠的、新的东亚夏季风的良好替代指标。     

Decay Detection of Ancient Wood Rafters in Tibet by Stress Wave Testing Method

Visual classification and stress wave non-destructive testing technology were adopted to evaluate the decay status of ancient Populus wood members （rafters） replaced from the Potala Palace. The decay status of wood members was evaluated by stress wave testing and visual observation. For most of the ancient wood members, the evaluation results by two methods were consistent with each other. Also stress wave testing techniques can find the internal wood member decay to eliminate the hidden hazard for ancient wood members, and offer relatively accurate quantitative information for the safety status of ancient wood members. Thus during the maintaining for ancient architectures, visual observation combined with stress wave testing techniques is a good way to evaluate the degradation of ancient wood members.     

Analysis of Original Causes of Reed Fires in Zhalong Nature Wetland Reserve in Heilongjiang Province

Zhalong Nature Reserve is located in the border areaof Qiqihaer City, Fuyu County, Lindian County andTailai County of Heilongjiang Province. The area ofthe reserve is 210 000 ha. The reserve is the firstnature reserve for protecting wetland and crane inChina. There were more than 300 red-crownedcranes here at the very most. Zhalong Nature Reserveis situated at the Songnen Plain, the lower stream ofthe Wuyuer River. It is the biggest nature reserve inChina that takes crane and wetland …     

闽南麻竹人工林地上部分现存生物量的研究

The construction ofaboveground biomass and biomass model of Dendrocalamus latiflorus plantation in SouthFujian are studied in this paper. The results are showed as follows (1)The abovegroundbiomass and the biomass of culm of D.latiflorus may reliably be calculated by the model,m=a*(D²H）^b,but the biomass of its culm and leaf may not. In orderto calculate it, it is necessary to introduce the factor, clear-height,and themodels,m=a*D^b(H-h）^c and m=a*D^b*［（H－h）/h］^c.(2)The total aboveground biomass of D.latiflorus plantation in South Fujian is 39.518 t*hm^－2.Thebiomass of 3-year-old is the highest,accounting for 59.17 percent of the total, followedby that of 2-,4- and 5-year-old successively. The biomass of culm is the highest in termsof organ, accounting for 62.81 percent of the fotal, followed by that of branch and leafsuccessively. The total aboveground biomass and the biomass of culm gradually decreasealong the height, and that of branch and leaf gradually decreases from the section of 6～8m to the top and to the bottom.     

Chromosome Substitution Lines in Cotton Improvement

Presently cotton breeders are confronting seriouschallenges due to the extensive use of narrowgenetic base in Upland cotton,Gossypiumhirsutum.Unique germplasm that incorporatesnew alleles must be developed to provideimproved genetic potential for yield,pest anddisease resistance.Tetraploid species such as G.barbadense,G.tomentosum,and G.mustelinum     

《福建林学院学报》被引频次与影响因子均名列前茅

根据中国科学引文数据库１９９８年１２月发布的《被引文频次最高的中国科技期刊５００名排行表》中,《福建林学院学报》在全国４０００多种科技期刊中被引频次位居第２３２位,在全国数１０种林业科技期刊中名列第４名,在全国１１种林业高校学报中名列第２名;在“中国...     

豇豆豆野螟的发生与防治

豆野螟俗称豇豆钻心虫,是豆科蔬菜上常见的害虫,主要危害豇豆、四季豆等。1发生特点豇豆豆野螟以幼虫蛀食花蕾和豆荚,常卷叶为害或蛀入荚内取食,花蕾及幼荚期受害造成大量落蕾、落花、落荚,影响产量。成荚期为害豆荚出现蛀     

首届话说长江石网友论坛在四川成都召开

4月28日下午14时，中华奇石网与长江奇石网在四川省成都市温江区天府花城展览交易中心会议室联合举办了名为“长江石之歌”的首届话说长江石网友论坛。     

家蚕对核型多角体病毒病的抗性遗传（译文）

用一个印度家蚕品种材料TX通过单回交试验进行研究其对桑蚕核型多角体病毒的抗性遗传模式。在二龄蚕第一天,用固定的BmNPV浓度(0.5×107PIB/mL)接种抗性亲本[TX]、敏感性亲本[HM]、它们的F1与F2代和F1反交TX[BC(R)]和HM[BC(S)]的后代。记录接种后10天内(包括第10天)的累积死亡率。结果表明TX对BmNPV抵抗性遵守孟德尔遗传规律,在F1代,抗性强过敏感性。虽然BC(S)的抗性和敏感性后代是1:1分离,但是F2代的抗性和敏感性是以3:1分离。BC(R)的反应有些类似于抗性亲本TX,说明TX包含一个对BmNPV抗性的显性基因。本文讨论TX抗性遗传的可能机制。     

蔬菜夏季遮阳网育苗技术

温室秋冬茬栽培、大拱棚秋延后栽培和露地秋茬栽培的蔬菜,在夏季育苗时会受到高温、多雨、病虫杂草多等不利因素影响,给培育壮苗带来许多困难,而利用遮阳网进行育苗能很好地克服以上不利因素,育出高质量的幼苗。遮阳网又名遮阴网、遮光网或凉爽网,有良好