林地生长数据 Forest Growth Data

图1. 林地中杨树生长数据

Image 1. Poplars' growth data

图2. 林地中松树生长数据

Image 2. Pines' growth data

2012年林地，共计造林434658棵，占地6269亩，是项目造林面积最大的年份。在2023年度2012-5、2012-6、2012-7由于道路积水，无法抵达，未进行测量。林地数据主体为2012-1、2012-2、2012-3、2012-4、2012-8五块林地。其整体保存率为69.39%。

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%.

该林地是樟子松和杨树的混交林，杨树是速生树种，生长速度较快。樟子松则相对缓慢。主要体现在树高、地径、胸径等生长指标上。其变化情况如下图。杨树的树高均值接近13米，增幅非常显著，杨树生长情况极佳；留存下来的樟子松树高均值增幅相对平缓，处于一个相对缓慢的生长期。杨树的地径、胸径均值增长显著，处于快速生长阶段。樟子松的地径、胸径均值增长缓慢，数值也偏低。

The plot was planted with both poplars and pines. As fast-growing type, the poplars were growing quickly, but pines’ growth speed was slow. The growth speed was shown on height, basal diameter, and diameter at breast height (DBH). The variation of these indicators over years is shown in the below graph. The average height of poplars was close to 13 meters and still growing fast, showing a great growth stage. The average height of the preserved pines was in slow growing stage. The basal diameter and DBH of poplars increased significantly, and was in fast growth stage. The increasing of the basal diameter and DBH of pines was slow, and the value was rather low too.

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。杨树的高于1.3米的比例非常稳定，维持在较高的水平。樟子松的比例有所上升。但樟子松的保存情况较差，高于1.3米的苗木数量依旧较少。

The diameter at breast height was measured at 1.3-meter-high point of the trunk. Reaching 1.3-meter high was the key factor for the variations of DBH. The percentage of poplars over 1.3 meter was very stable in high level. The percentage of pines increased a little. But the percentage of pines over 1.3 meters was still small.

图3. 树高均值变化

Image 3. The average tree heights over years

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

综上所述：和往年情况基本相同，该林地的杨树生长迅速，保存情况较好，树高、胸径、地径等均值增长明显，整体上处于快速生长期。樟子松的保存情况较差，保存下来的苗木两极化明显，略高大的苗木占多数，整体上还在缓慢生长。

Above all, the situation was basically the same as in previous years. The poplars in this forest grew rapidly and were well preserved. The average height, DBH, and basal diameter of the poplars had increased significantly, and generally in a fast growth stage. The preservation of pines was poor, and the preserved seedlings had obvious polarization, with taller seedlings accounting for the majority and slow growth overall.

林地情况说明 Forest Description

图6&7. 杨树和松树树行，2023.10.24

Image 6&7. Poplar and pine tree rows, October 24, 2023

该林地的杨树生长较快，今年的覆盖程度较高，枯落物覆盖较厚，部分地表形成了大片的苔藓结皮。而且杨树下部杂枝较多，需要进行修枝等抚育。樟子松缺失的情况较多，树行间存在低矮农作物间种，且树行不连续，松树间的优劣差异极大。

The poplars grew fast, and there was very high vegetation coverage in the site this year, with thick layers of dead leaves and plants cumulated on the ground. Part of the surface had formed large moss crusts. There were quite a few branches on the lower part of the trunk of poplars, which needed to be pruned. In pine tree rows, there were some absences of trees in between. There was also replanting of a few small corps in the site. And the tree rows were not consecutive. The differences of growth among the pines were huge.

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