Mode of inheritance of Alcobaca,a tomato fruit-ripening mutant

Summary Alcobaca, an abnormally ripening tomato mutant, was crossed with the normal cultivar Rutgers. Examination of F₁, F₂ and BC₁ populations indicated that a single recessive gene controls the mutant phenotype. No maternal effect was detected.     

以脱羧腰果壳液制表面活性剂

采用天然植物油（脱羧腰果壳液CNSL）作为疏水基的，经由己二异氰酸酯与亲水基聚乙二醇在较为温和的条件下反应，制得了两亲性表面活性剂，表征了其表面性能。该类表面活性剂的三个样品的临界胶束浓度为0．35－0．5g/L，亲油亲水平衡点为15．5－16．0，浊点为70－80℃，临界胶束浓度下的表面张力（25℃）为28－35mN/m。该技术为腰果壳液的综合利用开辟了一条新的途径。     

Ectomycorrhizal inoculation of Douglas-fir transplanted container seedlings with commercially produced inoculum

Commercially produced vegetative inocula of Laccaria laccata and Hebeloma crustuliniforme successfully formed ectomycorrhizae with Douglas-fir transplanted container (plug+1) seedlings. After 4.5 months in containers, 83% and 90%, respectively, of short roots were mycorrhizal. L. laccata- or H. crustuliniforme-inoculated seedlings had significantly more mycorrhizal and total short roots than Pisolithus tinctorius-inoculated (4% mycorrhizal root tips) or uninoculated control seedlings. No significant differences were detected in seedling growth at the end of the container phase.After transplantation and growth in nursery beds for 17 months, mean new short root colonization of all seedlings was 80%. H. crustuliniforme persisted as a dominant mycorrhizal fungus on seedlings initially inoculated with this fungus. L. laccata-inoculated seedlings had 40% of their short roots colonized by L. laccata and another 40% by native fungi Rhizopogon and Thelephora spp. All mycorrhizae of control seedlings and those inoculated with P. tinctorius were formed by fungi native to the nusery beds. A significant fungal treatment effect was detected for shoot height only. Control seedlings were significantly taller than L. laccata-inoculated seedlings after transplanting.This article is part of senior author's thesis in partial fulfillment of the Ph.D. degree in the Department of Forest Science at Oregon State University, Corvallis.     

杨柳无性系短轮伐期纸浆林培育技术研究

研究结果表明，黑杨派南方型无性系与苏柳无性系可作为我省在海涂、河滩地发展短轮伐期纸浆林的主要栽培树种，３年生高密度林分平均胸径大于５ｃｍ，树高８ｍ，蓄积１００ｍ３／ｈｍ２以上，纯收入１０００元／ｈｍ２，杨树造林密度可选择（１×３）、（２×２）ｍ，柳树（１×１．５）、（１×２）ｍ，３年生林分已达到工艺成熟和经济成熟。     

新型竹编水泥沼气池上部壳结构强度数值分析

应用壳曲面单元对在滇南农村一带开发推广的竹编水泥沼气池上部壳结构进行了三雏模型数值分析。数值计算结果与实地测试和二维计算结果一致，表明竹编水泥沼气池结构具有优良的力学特性，在承受荷载上具有足够的强度和安全系数，对于进一步在农村推广应用具有重要的现实意义。     

沙地杨树纸浆林栽培技术研究

为探索瘠薄干旱条件互氏浆林的栽培技术，选用４个杨树良和无性系，设计５种密度和４种整地，栽植深度，进行造林试验。结果表明：在平原沙地采是耐瘠薄的优良树品种，深栽７０ｃｍ，适当密植，前两年实行林粮间作，以耕代抚，第３，４年雨季前各追施 化肥，５ａ生林分总蓄积可达７７．４１－１８２．５６ｍ＾３／ｈｍ＾２，净产值可达２６２０．５－７３００．５元，其经济效益为纯农业的２．６７－７．８５倍。     

Length of cuttings in juvenile development of a hybrid poplar clone

The influence of length of cuttings on establishment of a short rotation plantation was investigated over a period of two years using direct field planting of unrooted Populus Rasumowskiana cuttings. The longer the cuttings, the higher were the survival and dry mass production. Survival at the end of the second growing season varied from 75% to 97%. In two years, the two longest cutting lengths (40 cm and 50 cm) produced about 100 g dry mass per living cutting; but owing to the higher survival rate of the longest cuttings, there was a difference per area unit: 360 g/m² for 40 cm and 400 g/m² for 50 cm-long cuttings. The shortest (10 cm) cuttings produced only 115 g/m².     

板栗空苞现象与内源激素动态变化的关系

内源激素的含量与板栗空苞有显著的相关性，正常板栗GA1＋3值花后一直上升至25d出现明显峰值，且在花后10d至25d增加非常明显，空苞板栗GA1＋3值没有明显增长，花后GA1＋3含量快速上升并达到一定的值有利于板栗胚胎的正常生长。正常板栗花后iPAs值持续增长至25d出现峰值，空苞板栗其值在花后15d内缓慢下降，后持续明显地下降。可见花后iPAs含量上升有利于板栗胚胎的正常生长，花后ABA含量降低有利于板栗胚胎发育。     

Intercropping eucalypts with maize in Minas Gerais,Brazil

This project was established in the Doce River Valley in the state of Minas Gerais, Brazil. The objective was to study the effect of intercropping one, two, three and four rows of maize between eucalypt seedlings planted in a 3.0×2.0 m spacing. Eucalypt data were collected at the age of six months when the maize was harvested. One row of maize intercropped between the rows of eucalypt did not lower the initial growth and survival of the trees, but did reduce the costs of the eucalypt plantations by 60%. Other treatments involving additional rows of maize reduced plantation costs, but also reduced the initial growth and survival of the trees.