伏牛山生态资源开发利用与发展思考 ——伏牛山生态资源保护和利用对策

伏牛山属秦岭山脉的支脉,位于北亚热带和暖温带的气候分区线,是物种南北过渡、东西交汇的"陆桥",特殊的地理位置和复杂多样的生态环境条件,使本区保存了丰富的生物多样性资源.通过对伏牛山区生态资源保护和利用现状的分析,找出薄弱环节,提出发展利用建议,以期为伏牛山生态资源的合理利用提供理论依据.     

3种散生竹的单根抗拉力学特性

植被在改善生态环境、减少水土流失、涵养水源、固土护坡等方面具有其他工程措施所不能替代的作用.现有研究表明,植物根系对土壤的力学作用,能够稳定土层结构、提高土壤的抗剪强度,是植被实现固土护坡的重要手段(Roering et al.,2003;李绍才等,2006;吕春娟等,2011). 林木根系的抗拉力学特性是影响根系固土护坡效果的重要因素(陈丽华等,2008).植物根系由众多单根构成,单根是发生根土力学作用的基本单元,单根的抗拉能力及抵抗形变能力决定了植株受外力时的整体形变状态及对土壤的约束能力,因此,具有较大抗拉强度的单根构成的根系将有助于土壤的稳固和增强.     

Organic substance metabolism during seed germination ofPinus bungeana

The metabolism of fats, proteins and carbohydrates and change of enzyme of seeds ofpinus bungeana during the germination were conducted by the methods of gas-liquid chromatography, flow injection, colorimetric analysis of spectrophotometer, to provide theoretical basis for seeds dormancy, germination and storage of seeds of forest tree. The results indicate that (1) carbohydrates were first utilized during germination of seed ofpinus bungeana; (2) stored substances in seeds began to decompose quickly after radicale broke through seed coats; (3) the activity of enzymes in the seeds does not always coincides with the increase or decrease in quantity of its responsible substance during germination of the seed. Changes in stored substance relate to metabalism of other metabolism of other materials and the use of hydrolysates.     

Protection and fastness of green color of moso bamboo (Phyllostachys pubescens Mazel) treated with chromium-based reagents

The attractive green color of moso bamboo (Phyllostachys pubescens Mazel) culms fades without chemical treatment. Chromated copper arsenate (CCA) has been used to protect the green color of bamboo, but CCA is harmful to factory workers and the environment. To overcome the toxicity of arsenic in CCA, two chromium-based formulas developed by the authors, chromated copper phosphate (CCP) and chromated phosphate (CP), were evaluated for their protection of the green color of moso bamboo. The results revealed that bamboo treated with CP had a greener color than those treated with CCA or CCP. The concentration, treatment time, and CrO₃/H₃PO₄ ratio in CP solution greatly affected the color of moso bamboo culms. The attractive green color, which resembles the color of fresh-cut moso bamboo, was obtained by treating bamboo with 2% CP solution at 60°C for 3h, using a 11 CrO₃/H₃PO₄ ratio in aqueous solution. In addition, the CP-treated moso bamboo exhibited excellent green color fastness in both accelerated ultraviolet lightfastness testing and outdoor weathering exposure.     

Dynamics of Integration between Chinese and International Waste Paper Markets

ABSTRACT

China is the largest importer of waste paper in the world and is highly dependent on the international market. Thus, the relationship between Chinese and international waste paper markets affects the supply of fiber materials in China’s paper industry. This study examined the dynamic relationship between the two markets and the impact of newly implemented policies on both markets. We used unit root tests, cointegration test, vector error correction model (VECM) and frequency-domain Granger causality test to investigate the integration between Chinese and international waste paper markets and identify which of the two markets is the price leader. The results revealed that the two markets were integrated after controlling for structural breaks, and the Chinese market acted as the price leader. Since the supply of waste paper and wood pulp is insufficient in China to meet the fiber demand of the paper industry, waste paper import restrictions have significantly affected the supply of fiber materials in China’s paper industry. Therefore, the Chinese government should fully consider the benefit of market integration and make full use of international waste paper resources to satisfy the large domestic demand for paper products.     

对节白蜡幼苗移栽育苗试验初报

大田播种不易管理，往往因种子还未发芽，苗田就长满杂草并与种子争水、争阳光，造成种子不易发芽，种子甚至发霉、变质、腐烂。而采取砂床播种，便于管理，发芽率高，出土整齐。     

Wood Moisture Content Measurement by X-Ray Exposure Method

lNTRoDUCTIONTheon-sitcnon-dcstructit'cmcasurcl11cntofu.oodmoisbocontcntattTactsgrcatintcrcsts.Itpla3'simpor-tantpartsinthescicntificrcscarchsucl1asonthchcatandmasstransportproccssesint"ooddri'ing.thcim-pregnationofliquidinxt'ood.thcmoisturccontcntdistri-b…     

辽河源地区油松生长与气象因子的相关分析

运用逐步回归分析方法,对辽河源地区油松生长与气象因子之间的关系进行分析,结果表明:影响油松胸径生长量的主导气象因子是年蒸发量、年日照时数和年降雨量;影响油松树高生长量的主导气象因子是年日照时数、年蒸发量和年降雨量。由此可知,对辽河源地区油松生长量影响较大的气象因子是年蒸发量、年日照时数和年降雨量。     

住宅楼卫生间暖卫管道根部渗漏原因分析及其防治

本文分析了住宅楼卫生间暖卫管渗漏的原因:管道孔洞未预留或预留的位置不当:管洞堵塞质量低劣:不重视堵塞管洞的支模材料。对此渗漏应采取的防治办法:正确预留管道孔洞:重视堵洞材料和堵洞质量:扣强对防水层和地漏排水的施工管理:在管道四周做馒头状档水台。