林地生长数据 Forest Growth Data

图1. 林地生长数据

Image 1. Forest Growth Data

林地保存率非常稳定,尤其是近三年。从保存率看,林木的保存情况不如同期林地好,但没有发生明显的林木损失。该林地栽植的全部为杨树,杨树是速生树种,生长速度较快。主要体现在树高、地径、胸径等生长指标上。从树高均值变化看,林地增长趋势明显。林地地径均值始终保持增长。胸径均值出现下滑。由于胸径测量比例几乎未发生变化,胸径均值的下滑也就不是由保存情况或采样量增大等因素导致的了。这主要是由于采样的系统误差导致的。

The plot’s preservation rate was very steady, particularly in recent three years. The preservation rate was slightly lower than the trees in other plots, but there was no obvious loss in the amount. This plot was planted with poplars. As poplars are fast-growing trees, the fast growth was featured in the indicators such as height, basal diameter, diameter at breast height etc. The growing trend was very obvious when looking at the variation of average height. The average basal diameter kept increasing as well, but there was a decline in the average DBH. Since the measurement percentage of DBH was almost the same, the decline was not caused by the preservation situation or the sample size. This was merely caused by systematic errors.

林地情况说明 Forest Description

图2. 林地树行(2020年10月25日)

Image 2. Tree Rows, October 25, 2020

图3. 林地北部(左)和南部(右)区域(2020年10月25日)

Image 3. Northern Part (Left) and Southern Part (Right) of the forest site, October 25, 2020

林地分为两部分,且存在一定距离。北侧地块(上图左)多为8米、4米档的杨树,主要的苗木缺损也来自这部分,这部分区域地势不平,密度较低。

The plot was divided into two parts, which were a bit far from each other. The northern part was made up of poplars that are around-8-meter-height or around-4-meter-height. The loss of saplings was found in this part, where the terrain was uneven and in low density.

南部区域密度较高,14米档杨树大部分在此区域,杨树生长均一,底部杂枝较多。南部区域(上图右)密度较高,14米档杨树大部分在此区域,杨树生长均一,底部杂枝较多。该林地保存情况稳定,处于快速生长期,但林地两部分之间的差异显著,林木杂枝较多,基本不存在灌木化问题。而且由于林地距离本地农户居住区非常近,林地受放牧等人为因素的影响较大。

The southern part had a high density, and the around-14-meter-height poplars mainly assembled in this part. The poplars were growing evenly, with similar heights, and many branches were cumulated at the bottom. Overall, the forest site was in stable status, and currently in fast-growing phase. The significant difference between the northern and southern parts remained, and many wildly growing branches were found on the trunk. There was no sign of turning into shrubs. The site was close to the residence of the farmers, so it could be affected by grazing.

林地赞助商列表 Forest Sponsor List