QUANTITATIVE DYNAMICS OF LARCH CATERPILLAR (DENDRALIMUS SUPERANS [BULLER]) AND THE BIOLOGICAL CONTROL

METHoDSoFlNVESTIGATIONIna24yearso1dlarchp1antation,asampleplotwassetup,inwhichloosam-pletreeswereselected.ThenumberoflarchcaterpillarsoneachsampletreewerecountedperiodicaI1y,whilethesameinves-tigationswerea1sodoneinlarchplanta-tionswithsameecologica1conditionssur-roundingthesamplep1ot.Asacontrol,ac-cordingtothedeve1opmentalprogressandlivinghabitsoflarchcaterpiIIar,thewholegenerationwasdividedintosevendevel0pmentaIstages:egg,firstinstar,thirdinstar(beforeoverwintering),fourthinstar(aft…     

A general equilibrium analysis of the economic aspects of the imposition of an export tax on the plywood sector in Indonesia

Computable general equilibrium (CGE) models are extensively used to simulate the economic impact of forest policies. In this study, we conduct a counterfactual analysis to assess the impact of an export tax ranging from 5 to 20% on the plywood sector to the Indonesian economy. The indonesian economy is aggregated into 5 sectors: 2 sectors are related to forest,i.e., (1) log, and (2) plywood. The other three sectors are not related to forest,i.e., (3) non-wood manufacturing, (4) agriculture, quarrying, and services, and (5) construction. The simulation results show that an export tax on the plywood processing sector is negatively correlated with real GDP and labor demand in log and plywood sectors, but is positively correlated with total labor demand, government revenue, income distribution, wood resources and social welfare. Reduction in labor demand by log and plywood sectors, due to a plywood export tax, can be absorbed in other sectors. The simulated policy of an export tax on plywood can reserve trees in production forests for future use.     

落叶松非结构集成材加工工艺的研究

以短周期工业材落叶松为原料生产非结构集成材，解决了劣材优用问题，提高了木材利用率，为家具制造和室内装修提供了理想的优质材料。     

STUDY ON RETAINING FUNCTION OF LARCH PLANTATION

INTRoDUCTIONInterceptingandstoringrainwaterisamajorfunctionofforestwhichnotonlyde-creasestheintensityofprecipitation,theimpulsiveforceonthestandland,themnoffonthesoilsurface,butalsopro-longsthetimeofrunoffdecreasesthefloodpeak,andregulatesthelevelofrivers.DahurianlarchwithfastgrowthandextensiveadaptabilityisamajorspeciesofshelterbeltinNortheast,NorthandNorthwestareasofChina.Studiesonfunc-tionoflarchstandininterceptingandstor-ingrainwaterisveryimportanttoprotectheadwaterofriversandtoconse…     

影响阻燃胶合板胶合强度因素的研究

分析了使用BL-环保阻燃剂压制环保阻燃胶合板过程中,热压温度、热压时间、单板浸渍时间和涂胶量对胶合强度的影响,并检测了氧指数、甲醛释放量和含水率。研究表明,使用BL-环保阻燃剂生产环保阻燃胶合板可以达到胶合强度标准,并提出了最佳工艺条件。     

Key to the puparium of three larch cone flies in Strobilomyia (Diptera: Anthomyiidae)

The key for puparia of the three species of larch-cone-flics (Strobilomyia) is developed based on their external morphological characteristics on anal (posterior) part which includes segmental protrusions and background texture. Some characteristics which are only visible under scanning microscope are also included even though they are supplementary in this key. Those three commonly found larch-cone-infestinganthomgiids arestrobilomyia melania, S. infrequens andS. laricicola.     

KEY MEASURES FOR ESTABLISHING THE FAST-GROWING AND HIGH-YIELD LARCH PLANTATIONS

Larchisoneofthemainspeciesforfast-growingandhigh-yieldplantationsinNortheastChina,especialIyLarixolgensisHerry-ItsmeanannualincrementcanevenreachlO.l-lO.6m3/hm2intheear1y3OyearsinrelativecoldYichunRegion.P1ant-ingfast-growingandhigh-yieldplanta-honsrequirehighqua1itysite.Buttherearetoolittlehighqualitysitetosatisfythede-mandoffast-growingandhigh-yieldplantationsinforestregionsofNortheastChina.MostoftheplantationshavetobeplantedonstublandofformerLarchplan-tations,Thus,#theeffectsofsecondr…     

落叶松木材的FRW阻燃处理技术

研究采用真空加压法、以新型木材阻燃剂ＦＲＷ对难以浸注处理的落叶松木材进行阻燃处理。结果表明，在压力为１．４ＭＰａ、加压时间为１８０ｍｉｎ、前后真空度均为０．０９８ＭＰａ、前真空时间为３０ｍｉｎ及后真空时间为１５ｍｉｎ的工艺条件下，能初步实现落叶松木材的有效处理。     

着色剂性能及覆膜竹胶合板用浸渍纸的染色

介绍了浸渍纸染色工艺的基本原理和方法、着色剂的基本特性以及一些常用着色剂的主要特点，并对影响浸渍纸染色效果的因素进行了初步的研究，结果表明着色剂与胶液混合时的温度、搅拌速度以及搅拌时间对着色剂的分散，从而对染色质量有重要的影响。     

结构胶合板蠕变测试方法的研究

木质材料的蠕变特性是衡量其能否适用于工程用途的重要指标。本文介绍了一种较为新颖的蠕变测试方法——应变测试法，即将结构用胶合板试件置于恒温恒湿恒定栽荷务件下，通过智能应变仪记录受栽后的位移，以实现长期的蠕变测定。经2个月的检测，结果表明，杨木结构用胶合板的蠕变曲线基本符合木材的三阶段蠕变理论，其结果真实地反映了材料在恒定外力下的变形情况，为进一步探求结构用胶合板的应用研究打下基础。