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。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，林地依旧在缓慢生长，树高达到一个较高的水平，接近本区域杨树高度的极限。林地地径增长在近三年恢复到了一个正常的缓慢增长的趋势，林地状态相对稳定。胸径测量比例基本稳定，但小幅度下滑，林地生长平稳，没有出现大规模损失。

The forest's preservation rate was very stable. The survival rate was slightly lower compared to other forest sites that were planted in the same year. There was no obvious loss in the tree rows. 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(DBH) etc. The variation of average tree heights over years showed that the growth of trees was slowing down, and the heights had remained in a high level, approaching the height limit of poplars in this area. The changes of average basal diameter in recent three years were recovered to a normal slow-increasing trend. The status of forest was stabilized. The percentage of measurable DBHs remained stable with a slight decrease. Overall, the forest is well maintained, and there was no large-scale loss of trees.

图2. 胸径地径均值变化

Image 2 Basal diameter and DBH of the forest site over years

图3. 胸径测量比例变化

Image 3. The percentage of measurable DBH over years

林地情况说明 Forest Description

图4. 林地北侧地块，2023.8.30

Image 4. Northern part of the forest, August 30, 2023

图5. 林地南部地块，2023.8.30

Image 5. Southern part of the forest, August 30, 2023

林地分为两部分，且存在一定距离。北侧地块（如图4）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，地面植被的覆盖程度较高。

The plot was divided into two parts, which were a bit far from each other. The northern part (image 4) was made up of poplars that are around-8-meter-height or around-4-meter-height. The loss of saplings was found in this rugged part, where the planting density was low and The ground vegetation coverage was high in this part of the site.

南部区域（如图5）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，枯落物积累较多。该林地保存情况稳定，基本脱离快速生长期，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 (image 5) had a high planting density, and the around-14-meter-height poplars mainly assembled in this part. The poplars were growing evenly, with similar heights. Many branches were cumulated at the bottom, and dead leaves and branches covered the ground. There occurred few pest diseases. Overall, the forest was in stable status, and past its 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 trees turning into shrubs. The site was close to the residence of the farmers, so it was affected by human activities, such as grazing.

林地赞助商列表 Forest Sponsor List