南京林业大学学报（自然科学版）2016，Vol.40Issue(4)：143-148,6.DOI:10.3969/j.issn.1000-2006.2016.04.023
环境温度对活立木横截面电阻值的影响
Effects of environmental temperature on the electrical resistance on the cross section in standing tree
摘要
Abstract
In order to investigate the effect of environmental temperature on the internal electrical resistance value of standing trees, two standing tree ( Larix gmelinii and Populus simonii) specimens were selected and tested using the e⁃lectrical impedance tomography instrument at different environmental temperatures. Some two⁃dimensional electrical im⁃pedance images of cross section of specimens were then obtained and comparatively analyzed. The electrical resistance value of each point on the cross section was quantitatively examined and the relationship between these values and tem⁃perature were discussed. Research results showed that: ① For L. gmelinii, the electrical resistance value of heartwood was lower than that of the sapwood. As temperature decreased, the red area ( high resistance region) at sapwood reduced and the blue area ( low resistance region) at heartwood increased. For P. simonii, the result was completely opposite. However, the average electrical resistance values for overall cross section increased as temperature decreased. ② There were highly significant exponential regression models between the sample electrical resistance values and temperature ( P<0�01) with the correlation coefficients of ≥0�822 ( L. gmelinii) and ≥0�926 ( P. simonii) . ③ For L. gmelinii, when temperatures were above 0℃, the fluctuation of radial resistance value was not obvious, and the maximum differ⁃ence was 1 236Ω( at 3.0℃) . When temperatures were below 0℃, it fluctuated greatly, and the maximum difference was 3 299 Ω (-5.0 ℃) . There are two troughs and one peak in the middle of the trend line. ④For P. simonii, the re⁃sistance value of each point in the radial direction showed a trend of increase with the decrease of temperature. The re⁃sistance value increased initially and then decreased from one edge to the other in the radial direction.关键词
活立木/环境温度/电阻断层成像/横截面Key words
standing trees/environmental temperature/electrical resistance tomography/cross section分类
农业科技引用本文复制引用
王玉婷,徐华东,王立海,刘泽旭,王兴龙,孙雨婷..环境温度对活立木横截面电阻值的影响[J].南京林业大学学报（自然科学版）,2016,40(4):143-148,6.基金项目
国家自然科学基金项目（31300474）；黑龙江省自然科学基金面上项目（C201410）；中央高校基本科研业务费专项资金项目（2572015CB03）；国家林业局“948”项目 （）
