In 2012, MTP planted 434,658 trees in total, covering an area of 418 hectares. 2012 was the year when MTP planted the most trees since the beginning of the program. The 2012-5, 2012-6 and 2012-7 forest sites couldn’t be reached because of road waterlogging in 2023. These three sites were excluded in the survey. The statistics came from the survey on 2012-1, 2012-2, 2012-3, 2012-4 and 2012-8 forest sites. The overall survival rate of these forests was 69.39%.
图3. 树高均值变化
Image 3. The average tree heights over years
该林地的杨树保存情况较好，维持在90%左右。樟子松的保存率保持在60%以上。林地的保存情况稳定。杨树是速生树种，生长速度较快，在2023年度基本达到峰值。樟子松则相对缓慢，依旧处于生长期。主要体现在树高、地径、胸径等生长指标上。杨树和樟子松的历年树高均值比较如上图，大致趋势和往年相同，杨树树高的增长明显，增幅放缓，接近树高生长极限。而樟子松的增幅相对固定，处于缓慢增长的阶段。
The preservation of poplars was well-maintained, and the survival rate stayed around 90%. The survival rate of pines was stabilized above 60%. The overall status of the forest was stable. The poplars, as fast-growing species, grew rapidly to its peak in 2023, while the pines grew slowly and still in the growth phase. These were featured in growth index such as height, basal diameter, diameter at breast height (DBH) etc. The average height of the poplars and pines were showed above, and the trend was similar to previous year. The height of the poplars increased significantly and the growth rate was slowing down, approaching the limit of tree height growth. The poplars were in fast-growing phase, and the pines were stabilized in slow-growing phase.
杨树的胸径和地径均值都呈现增长趋势，且增幅相对固定，生长状态相对正常。樟子松的地径增幅相对固定，胸径增幅较去年变大。胸径的测量的位置在树干1.3米高度处，苗木达到1.3米高度的比例是影响胸径变化的重要因素。杨树的可测量胸径比例维持着较高的比例，相对稳定，其变化主要受苗木死亡和测量误差影响。樟子松的可测量胸径比例在2023年度发生增长。这主要是由于低矮樟子松在降水充足情况下的快速生长。
The basal diameter and diameter at breast height of poplars kept increasing, and the increasing speed was stable, meaning that the growth of poplars was up to the standard. The increasing range of the basal diameter among pines was stable, and the DBH increased rapidly than last year. The DBH was measured at 1.3-meter-high-point of the trunk, so reaching 1.3-meter-high was the key factor for DBH changes. The percentage of measurable DBH among poplars was kept in high level and stabilized. The small changes were affected by the dying of trees or measurement errors. The percentage of measurable DBH among pines was increasing in 2023. The small pine saplings were growing rapidly due to the sufficient rainfall.
图4. 胸径地径均值变化
Image 4. Basal diameter and DBH of the forest site over years
图5. 胸径测量比例变化
Image 5. The percentage of measurable DBH over years
总体而言，杨树生长情况与往年基本一致，杨树的树高、地径、胸径等指标的数值变化相对正常，且没有出现大面积死亡和灌木化的问题。樟子松的树高和地径均值的变化趋势相对正常，樟子松依旧位于缓慢生长的阶段，地径和树高在缓慢增长。林地整体上生长比较稳定。
In conclusion, the growth of poplars was similar to previous years, and the variations of height, basal diameter, DBH were up to standard. No large scale of dying trees or brushing problem found in the forest. The pines were in slow-growing phase, with the basal diameter and height increasing slowly. The trends in the average height and basal diameter changes were normal. The growth of the forest was stable.
林地情况说明 Forest Description
图6&7&8. 林地树行，2023.10.20
Image 6 &7&8. Long shot and close shot of tree rows, October 20, 2023
杨树行相对高大，缺失的情况较少，樟子松的缺失情况较多。小范围区域间种了豇豆、荞麦等低矮农作物，地面植被的覆盖较高，地面积累了一定程度的枯落物。
The poplar rows are tall and big in tree size, without any obvious absence of trees in the rows. But the absence of trees could be found in the pine rows. There was interplanting among the site with some small corps such as cowpeas and buckwheat. The vegetation coverage was high, and some layers of dead leaves and plants were cumulated on the ground.
林地赞助商列表 Forest Sponsor List
