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Study about the suitable level of technology of forest utilization by evaluation of resource use and environmental impact

通过资源利用和环境影响评价研究森林利用技术适宜水平

基本信息

批准号：
16580118
负责人：
NITAMI Toshio
金额：
$ 1.92万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

The disturbance in forest by construction of forest road and forest operation was studied from the point of view of increasing of forest resource and keeping constancy. Harvesting of forest resource which includes cutting standing trees leads decrease of biomass in forest. And that causes decline in ability of carbon dioxide fixation. It is assumed that the ability are restored in three years by growth of plants.Some thermometers were set on two sites, for test and control in forest. Change of temperature had been recorded in both site. While recording the temperature, the test site had thinning operation. After thinning, the temperature is raised in test site. The difference of test site and control site had decreased with the years.After thinning, which rate is 30%, the maximum temperature in test site was differ 3 to 5 degrees from control site. In average temperature, the difference was 0.5 to 1 degrees. This different had remained one and half year since thinning. It is assumed th … More at it takes about three years extinction of the difference of temperature. About 100m3/ha biomass are removed from forest, but tree grows about 30m3 in three years.The volume of harvested biomass from standing tree is almost same as wood logs. Efficient use of that biomass can make more energy than lost energy caused by decreasing of forest resource. New technology and new framework of utilization of woody biomass enable reduction of C02 emission, bio-ethanol from woody biomass, and other utilization of woody biomass. The difference of test site and control site had decreased with the years.After thinning, which rate is 30%, the maximum temperature in test site was differ 3 to 5 degrees from control site. In average temperature, the difference was 0.5 to 1 degrees. This different remained after one and half year since thinning. It is assumed that it takes about three years to remove the difference of temperature. About 100m3/ha biomass are removed from forest, but tree grows about 30m3 in three years.The amount of biomass from standing tree is almost same as wood logs. Efficient use of that biomass can make more energy than lost energy caused by decreasing of forest resource. New technology and new framework of utilization of woody biomass enable reduction of C02 emission, bio-ethanol from woody biomass, and other utilization of woody biomass. Less

从森林资源增长和保持恒定的角度，研究了林道建设和森林作业对森林的干扰。森林资源的采伐，包括对立木的采伐，导致森林生物量的减少。这导致二氧化碳固定能力下降。在两个试验点设置了温度计，分别进行了林内温度测定和对照。两个部位均记录了温度变化。在记录温度的同时，试验部位进行疏伐操作。稀释后，在试验现场进行升温。试验地与对照地的最高气温差异随年份的增加而减小，间伐30%后，试验地与对照地的最高气温相差3 ~ 5 ℃。在平均温度方面，差异为0.5至1度。这种差异自疏伐以来一直持续了一年半。假设 ...更多信息温差消失大约需要三年的时间。每公顷森林被采伐的生物量约为100 m3，但树木在三年内生长约30 m3，从立木中收获的生物量与木材的体积几乎相同。生物质的有效利用可以使更多的能量超过因森林资源减少而损失的能量。利用木质生物质的新技术和新框架能够减少CO2排放、从木质生物质制备生物乙醇以及木质生物质的其他利用。试验地与对照地的最高气温差异随年份的增加而减小，间伐30%后，试验地与对照地的最高气温相差3 ~ 5 ℃。在平均温度方面，差异为0.5至1度。这种差异在间伐后一年半仍然存在。据推测，消除温差大约需要三年的时间。每公顷森林流失的生物量约为100 m3，但树木在三年内生长约30 m3，活立木的生物量与木材的生物量基本相同。生物质的有效利用可以使更多的能量超过因森林资源减少而损失的能量。利用木质生物质的新技术和新框架能够减少CO2排放、从木质生物质制备生物乙醇以及木质生物质的其他利用。少