竹笋膳食纤维开发和主要功能性质的研究   总被引：11，自引：5，他引：11  

谢碧霞  钟海雁  谢涛  李安平  江年琼 《经济林研究》2000,18(2):8-11

本文以竹笋渣、竹笋壳为原料,研究了各种竹笋膳食纤维的生产工艺,并对产品的膳食纤维含量和主要功能性质进行了分析。  相似文献   

Transesterified Chinese Spicehush (Lindera communis) seed oil as a biodiesel fuel     

Wang Wei-gang Ma Lei Jiang Jian-xin Jiang Li Zhang Zhi-xiang 《中国林学(英文版)》2007,9(2):132-136

Studies were carried out on the transesterification of the Chinese Spicehush (Lindera communis) seed (LCS) oil with methanol for the production of biodiesel. The methyl esters of LCS oil were compared with soybean esters to determine biodiesel fuel performance and properties. The fatty acids content in the seed kernel oil (LKO) and coat oil (LCO) were quantified by gas chromatography and mass spectrometry method (GC-MS). LKO contains 95.1% saturated acids (capric, lauric, myristic and palmitic) and 2.3% unsaturated acids (oleic). LCO contains 24.6% saturated acids (palmitic and stearic) and 73.6% unsaturated acids (oleic, linoleic and palmitoleic). The kinematic viscosity, cold filter plugging point, cloud point, flash point and cetane index were determined. The methyl esters of LKO had a higher kinematic viscosity and a lower cold filter plugging point value, so it has better per- formance in cold weather. The biodiesel of LCS oil has fuel properties within the limits prescribed by American (ASTM D 6751-02) standards, except for a slightly lower flash point of LKO biodiesel than that prescribed by these standards (130°C). Thus, LKO and LCO biodiesel have great potential to be used on a large scale as fuel for diesel engines.  相似文献   

滇西北亚高山地区黄背栎林植被演替过程中的林地土壤化学响应   总被引：2，自引：0，他引：2  

宋洪涛  张劲峰  田昆  郭华  陈华丽  刘忠杰  薛阳富 《西部林业科学》2007,36(2):65-70

探讨了滇西北亚高山地区黄背栎林植被演替过程中林地土壤化学性质的变化。研究结果表明:在该植物群落不同的植被演替阶段,其林地土壤的化学性质与之相响应。随着其植被的正向演替,林地土壤各项化学指标均向良性发展:土壤的pH值逐渐降低;土壤有机质、全N及水解N含量均呈上升趋势;速效K含量在演替顶极前期达最大含量,到演替顶极期有所下降;速效P含量在演替过程中有所变化,但随其植被演替的变化不明显,没有一定的规律性;林地上层土壤养分增加较之下层土壤增加率要大。该地区土壤化学性质变化与其群落的良性发展呈正相关。  相似文献   

关于伊春"三林"流转试点情况的调查     

伊春市政协专题调研组 《绿色中国(A版)》2005,(22):12-15

伊春市以林权制度改革为突破口,大力发展民有林,以桃山林业局和嘉荫县为试点,进行了森林、林木和林地使用权即“三林”流转。文章通过实地调研,认为其改革突出一个“权”字,落实一个“价”字,体现一个“利”字,利国利民,同时也指出目前存在的认识、评估机构、保险、林权证发放等实际问题,并相应提出政策建议。  相似文献   

基于熵理论的国有林区林权改革分析     

孟莉  王立海  万阳 《森林工程》2006,22(6):57-59

应用熵理论对我国国有林区目前的林业系统状态进行分析，得出国有林区林权制度必须改革的结论，并从系统论、经济学和林业可持续发展角度探讨了国有林区林权制度改革的意义。  相似文献   

Thermal insulation properties of wood-based sandwich panel for use as structural insulated walls and floors     

Tamami Kawasaki  Shuichi Kawai 《Journal of Wood Science》2006,52(1):75-83

Thermal insulation and warmth-keeping properties of thick plywood-faced sandwich panels with low-density fiberboard (plywood-faced sandwich, PSW), which were developed as wood-based structural insulation materials for walls and floors, are comprehensively clarified. The properties focused on were thermal conductivity (λ), thermal resistance (R), and thermal diffusivity (D). The results for PSW panels were compared with those for commercial wood-based boards, solid wood, and commercial insulators. The λ values were measured for PSW panels and their core and face elements. As a result, the composite theory of λ was found to be appropriate for PSW composites, because the calculated/experimental λ ratios were approximately 90%. The λ values for PSW panels with densities of 340 kg/m³ (PSW350) and 410kg/m³ (PSW400) were 0.070 and 0.077W/mK, respectively. The R values for PSW350 and PSW400 were 1.4 and 1.2m²K/W, and the D values were 0.00050 and 0.00046m²/h, respectively. Consequently, the PSW provided thermal insulation properties superior to those of the boards and in terms of warmth-keeping properties were greatly advantageous over the insulators. These advantages were due to the moderate densities of PSW panels. The PSW panel with sufficient thickness showed remarkably improved thermal resistance compared with those of the boards.  相似文献   

浸渍塑化杨木单板顺纹弯曲性能研究   总被引：1，自引：0，他引：1  

罗江丽  杨家富  杨淑琴 《林业机械与木工设备》2007,35(2):19-21

本研究以酚醛树脂为浸渍液,杨木单板为木材试样,对经浸渍塑化处理的杨木单板进行三点弯曲试验,探索了木/竹复合层合板的组分材料--塑化杨木单板受不同压力时的顺纹弯曲弹性性能,并分析了其与塑化压力间的关系.结果表明,塑化杨木单板的静曲模量和静曲强度与塑化压力呈非线性关系.通过对杨木单板试验研究,为木材/竹材复合材料制造过程中的结构设计和生产工艺提供一定的理论依据和基本思路,并对产品的设计、组织现场生产和产品质量评估提供一定的参考.  相似文献   

柏木种子园无性系结实性状遗传变异研究   总被引：1，自引：0，他引：1  

徐高福  金国庆  丰炳财  罗小华  储德裕  唐淑琴  洪苏州  王海生 《浙江林业科技》2006,26(2):5-9

利用柏木一代无性系种子园中15个无性系75个分株材料，研究无性系结实性状的遗传变异规律。结果发现，不同无性系的结实能力差异巨大，其无性系重复力较高。柏木无性系母树结实主要集中在树冠中上部213的树冠层分枝上，其结实量占全株的86％左右。通过性状相关分析，得出理想的柏木种子园高产无性系母树的主要形态特征为：树高中上，树冠浓密适中，冠高长，结实分枝多，树冠上部分枝较长，但下部分枝相对较短，树体外形呈宝塔形。  相似文献   

来源于解酯菌的嗜热耐碱脂肪酶的表达纯化及其酶学性质研究     

许蕊  张昕怡  潘悦  张瑜  李迅  王飞 《林业工程学报》2020,5(3):108-114

脂肪酶广泛应用于食品加工、生物柴油制备等领域。为了有效提高微生物脂肪酶的可利用度,将来源于解酯嗜热菌(Thermosyntropha lipolytica DSM 11003)的脂肪酶基因(tll2)克隆到大肠杆菌表达载体pET28a中,获得重组质粒pET28a TLL2,将pET28a TLL2转入大肠杆菌BL21(DE3)宿主菌中进行高效表达。通过热处理和镍柱亲和层析得到电泳纯的蛋白TlLip2,对其进行酶学性质表征。结果显示,TlLip2的亚基分子质量为57 ku,比酶活为31 U/mg,最适反应pH及温度分别为8.0和60℃。在60℃以下、pH 6.0~11.0范围内,TlLip2的稳定性较好,相对酶活均维持在60%以上。金属离子K+和Na+对TlLip2有较大激活作用,而Co^2+、Zn^2+、SDS和Tween 80对TlLip2酶活力抑制作用明显。TlLip2在极性小的有机溶剂中具有较好的耐受性。TlLip2对中等碳链长度的对硝基苯酯显示出更高的活性,其中以对硝基苯己酯为底物时,TlLip2的酶活最高;以对硝基苯棕榈酸酯为底物时,该酶的动力学常数Km为0.29 mmol/L,Vmax为2.28 mmol/(L·min^-1),kcat为6.19 s^-1。此外,将其应用到油酸乙酯的合成研究中,以油酸和乙醇为底物,研究TlLip2催化制备油酸乙酯的转化条件,结果表明在60℃、加酶量为100 U/g的TlLip2,催化摩尔比为1∶2的油酸和乙醇,12 h后油酸乙酯的转化率达到62.1%,表明TlLip2在催化脂肪酸酯化方面具有较大的应用潜能。  相似文献   

浅论我国集体林产权法律制度   总被引：1，自引：0，他引：1  

于德仲  刘俊昌  马天乐 《绿色中国(A版)》2005,(24):38-39

文章从法制的角度分析了我国集体林产权问题,介绍了林业发达国家发展集体林、私有林产权制度的基本经验,结合我国集体林的具体林情,阐述了在市场经济条件下,进一步完善我国集体林产权法律制度的相关问题。  相似文献