五台山林区华北落叶松育苗技术

华北落叶松为松科落叶松属高大乔木,是五台山林区主要的森林树种,也是寒温带针叶林的代表性树种。介绍了五台山林区华北落叶松生态学特性、采种育苗、幼苗管理及病T害防治技术。     

日本落叶松扦插繁殖试验

1960年起,我院自朝鲜引进日本落叶松、朝鲜落叶松、长白落叶松和自山西省引进华北落叶松等种子,在我院教学试验林场进行育苗造林。其生长表现均良好,而以日本落叶松生长尤佳。1975年我们对定植的落叶松进行了优选、采种繁殖。由于种类混杂和天然杂交的影响,苗木分化很大。为了建立各种落叶松种子园,我们于1978年选用华北落叶松作砧木、日本落叶松作接穗进行嫁接繁殖,效果较好。     

促进华北落叶松母树林结实措施探析

对内蒙古巴林左旗乌兰坝林场国家级良种基地华北落叶松母树林采取树体环剥、疏枝、断根等不同的技术措施,探讨这些技术措施对促进母树林结实的影响,为经营华北落叶松母树林提供科学的理论依据。     

林业近讯

喀喇沁旗旺业甸林场在抓好造林育林的同时,狠抓了优良林木种子基地建设。从1965年开始,陆续建立了长白落叶松母树林680亩,华北落叶松林3,579亩,樟子松母树林325亩。为了实现林木良种化,1972年该场与中国科学院林业土壤研究所协作,经过八年的努力,采取无性系嫁接繁殖的方法,建成日本落叶松种子园1072亩,华北落叶松种子园180亩。现     

永恒的春天

永恒的春天在雄伟壮丽的太行山中段，在碧波荡漾的清漳河畔，座落着一个省直森林经营局，她与英雄的山脉同名，用绿色延续着山河的永恒。太行山森林经营局曾首次在太行山培育成功了华北落叶松苗木，并创建了拥有５万余亩落叶松人工林的用材林基地。但在新形势下，这个局却...     

阜新地区油松采种基地合理经营的探讨

阜新地区是全国油松主要采种基地之一。通过对该地区采种基地现状及存在问题的剖析，提出了重新划定林分，建立以种子园、母树林、采种林相结合的采种基地；对采种基地加强营林措施；加强法制，保证林木种子宏观管理的正常进行；建立一支专业性强的种子生产队伍等一系列合理经营措施。     

干旱半干旱地区华北落叶松人工林可持续经营技术研究进展

对国内外关于干旱半干旱地区森林的可持续经营理论研究进行了综合评述,介绍了干旱半干旱地区森林特别是华北落叶松人工林可持续经营技术及研究现状,指出了当前国际及国内主要森林可持续经营的指导思想,介绍了森林认证的目的、作用等,阐述了干旱半干旱地区华北落叶松人工林可持续经营的发展趋势和生产实践中急需解决的重点问题。意在为干旱半干旱地区华北落叶松人工林的持续经营提供理论支持,并为将来干旱半干旱地区华北落叶松人工林方面的研究提供理论依据。     

山西文峪河国家湿地公园华北落叶松人工林多功能经营技术

笔者以山西文峪河国家湿地公园关帝林区华北落叶松人工林为例,从华北落叶松人工纯林密度优化调控技术、目标树大径材培育技术、低效林质量提升技术3方面介绍了华北落叶松人工林多功能经营技术体系。从建立固定观测样地、确定实施对象、林木分类和林分抚育、近自然抚育强度4方面总结了华北落叶松人工林多功能经营技术系统的建设措施,以期为今后山西省华北落叶松林的经营管理提供技术参考。     

华北落叶松优良无性系选育研究

为筛选出华北落叶松(Larix principis-rupprechtii)优良无性系,对大同市长城山林场华北落叶松国家重点林木良种基地的40个华北落叶松无性系树高、胸径生长量指标进行了调查,结果表明:7、7509、113这3个华北落叶松无性系长势最好,是华北落叶松优良无性系的重点选择对象;而123、713、124、2...     

搞好采种基地 加快绿化步伐

龙头山林场位于围场县中北部,伊逊河纵贯全场,查字作业区延伸至赛罕坝下。海拔1000至1500米,山高坡陡,气候恶劣。全场总经营面积174479亩。天然次生林59729亩,落叶松人工林67450亩,森林复被率已达71％。目前尚有宜林地近50000亩。 为了解决落叶松种子奇缺的困难,我们遵照伟大领袖毛主席关于“自力更生”的教导,在各级党委和上级主管部门的领导和大力支持下,两年来,共整建华北落叶松采种母树林5350亩,占落叶松人工林的12.5％,已初步收到了良好效果。     

我国落叶松人工林地力衰退与施肥研究综述

落叶松是我国栽种区域最广的针叶树种。落叶松人工林的发展, 对我国人工林的发展至关重要。文中论述了我国落叶松人工林地的土壤物理性状、土壤化学性状和生物学性状, 分析了落叶松人工林地力衰退的研究现状并重点对落叶松人工林的施肥时期、施肥方法、施肥种类和用量以及施肥效应进行了归纳总结, 旨在为落叶松人工林的可持续发展以及营养管理研究和集约经营研究提供参考。     

我国落叶松人工林土壤肥力研究现状及改善措施的研究

落叶松为华北地区高山针叶林带中的主要森林树种.随着我国经济的快速发展,对木材的需求量加大,落叶松人工林种植面积持续增加.目前,由于其林分结构不合理、林分密度过大,出现了林地土壤肥力持续下降,并引起了林木生长量的下降等问题.本文综述了目前我国落叶松人工林土壤肥力的研究现状及改善措施,并指出一是通过自然干预可以大大减少人力...     

我国落叶松遗传改良现状及发展方向

介绍了落叶松在我国的自然分布研究及其在解决我国近期木材短缺方面的作用、遗传改良研究成就和存在的问题, 阐述了今后的研究重点, 以求有实效地为落叶松商品林经营提供良种支持。     

Dynamics of soil nutrients in larch plantations

IntroductionThesoildegradationofaFtificialforestisthecoreofresearchforplantationtostabilityandafforestationinChina.lnrecentyears,studiesonsoilfertiIityofplantationshavegradua[Iyincreased.forChinesefir,massonpine,popIar,Iarch,etc.Manyspecificmeas-ureshavebeenputfotwardtomaintainthesoilfertil-ityIevelinaFtificialforest(Pan1997,Yan1997lYan1996).owingtovariabilityofsoilfertilityinplantation,ithasmanydifficuItiestostudythesoiIfertility.Forexample,thesoiIsampIeplothastobemovedhori-zontalIyino…     

影响培育落叶松人工林的因素及对策

本文分析了影响培育落叶松人工林的不利因素,提出落叶松发展需要注意的问题及对策,使落叶松在培育过程中能充分发挥短期效益。     

Effects of intercropping systems of trees with soybean on soil physicochemical properties in juvenile plantations

The intercropping system of tree with soybean in juvenile plantations, as a short-term practice, was applied at Lao Shan Experimental Station in Mao’er Shan Forest of Northeast Forestry University, Harbin, China. The larch (Larix gmelinii)/soybean (Glycine max.) and ash (Fraxinus mandshurica) intercropping systems were studied in the field to assess the effects of the intercropping on soil physicochemical properties. The results showed that soil physical properties were improved after soybean intercropping with larch and ash in one growing season. The soil bulk density in larch/soybean and ash/soybean systems was 1.112 g·cm⁻³ and 1.058 g·cm⁻³, respectively, which was lower than that in the pure larch or ash plantation without intercropping. The total soil porosity also increased after intercropping. The organic matter amount in larch/soybean system was 1.77 times higher than that in the pure larch plantation, and it was 1.09 times higher in ash/soybean system than that in the pure ash plantation. Contents of total nitrogen and hydrolyzable nitrogen in larch/soybean system were 4.2% and 53.0% higher than those in the pure larch stand. Total nitrogen and hydrolyzable nitrogen contents in ash/soybean system were 75.5% and 3.3% higher than those in the pure ash plantation. Total phosphorus content decreased after intercropping, while change of available phosphorus showed an increasing trend. Total potassium and available potassium contents in the larch/soybean system were 0.6% and 17.5% higher than those in the pure larch stand. Total potassium and available potassium contents in the ash/soybean system were 56.4% and 21.8% higher than those in the pure ash plantation. Biography: FAN A-nan (1972–), female, Ph. Doctor in Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, P. R. China.     

NUTRIENT CYCLING IN THE DAHURIAN LARCH PLANTATION ECOSYSTEM

TllcbiologicalcycIingofnutricntclc-lllcntslntl1cccosystclnisthecyclingbctweentllcplantconununityandsoilwitl1intheccosys-tclll(Ot/ington,l986).ltformsol1ebranchofbiogQochcn1icalcyclesandislnarkedwitl1higl1spccdal1dil1tcl1sit}'.Biologicalcyclcofnutri-cntclenlcntsiscorrelatedwithforestproduc-tit'it3'closcly-tbeabsorptionandutilizatio11ofthe11utricntelemcntsoftheplantareillflu-cnccddircctl3'orindirectlybykindsofenvi-ronn1cntallbctorsandsomephysiologicalandlllatcrialproducingprocessareattectcd.Sot…     

落叶松人工纯林接续林培育技术的浅析

阐述了落叶松人工纯林的缺陷，提出了其培训目标和培育的技术，调整林分树种组成与优化林分结构，最终获得最大的生态效益，社会效益和经济效益。     

东丰县国有落叶松人工林定向培育的探讨

针对东丰县现有国有叶松人工林的采伐方式以及各龄级的面积、蓄积比例分布失调的状况，进行一次远近利益相结合的统一规划，定向培育一些大径材林木，以达到龄级分布相对均衡，变单一木材生产为立体生态经营。     

Variability of the seeds and cones and key taxonomic characters selection ofLarix in Northeast China

The paper presents the results of biometrical study of the seeds and cones of larch taxa from Northeast of China. Fourteen characters are considered and their analyses showed that the seeds and cones of the larch taxa were relative greatly variable. Cluster analysis and principal component analysis for all 6 larch taxa were made. The analysis results proved that the dominant larch population in Toudao Farm fell within the range of variation ofLarix olgensis. The key taxonomic characters are the length of seed wing, length of cone, length of seed, the length/width ratio of seed and number of scales. This research was supported by Natural Science Foundation of Heilongjiang Province.(C9515) Responsible Editor: Chai Ruihai