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%.

图3. 树高均值变化

Image 3. The tree heights over years

该林地的保存情况相对良好,杨树保持在80%以上,樟子松保持在60%以上,近几年保存率的变化极小,保存情况稳定。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。杨树的树高均值达到10米,生长良好。樟子松的树高均值超过4米,增幅相对平缓。杨树的地径和胸径均值保持增长,增幅有所放缓,但都达到了较高的水平,符合杨树快速生长的特征。樟子松的地径均值增长幅度和胸径均值相对于去年较小,生长数据平滑,符合其生长缓慢的特点。

The forest was preserved well, with survival rate of the poplars being above 80% and pines being above 60%. The plot was planted with a combination of pines and poplars. Poplars, as fast-growing type, grew quickly. The pines grew rather slowly in growth index such as height, basal diameter, diameter at breast height. The average height of poplars was above 10 meters, which had a healthy growth. The average height of pines was above 4 meters and kept growing slowly. The average basal diameter and DBH kept increasing, but in a slower speed than before. The two indicators both reached a high level, typical of the fast-growing poplars. The average basal diameter and DBH of the pines increased less than last year and had a smooth growth, showing the typical of the slow-growing pines.

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。其比例如下图所示。杨树由于生长速度较快,树高很快就达到了测量胸径的高度,并且维持着较高的比例,其变化主要受苗木死亡和测量误差影响。樟子松的可测胸径比例下滑,基本维持在较高的比例,樟子松处于一个较健康的生长期。

Reaching 1.3-meter-high is critical for the variations of DBH. The poplars reached the DBH-measurable-height very quickly and kept the measurable percentage in in high level. Its variations were only affected by the dying trees or measurement errors. The measurable percentage of pines decreased a bit, but still maintained in a high level. The pines were maintained in their healthy growth stage.

图4. 胸径地径均值变化,左侧蓝色为樟子松,右侧红色为杨树

Image 4. Basal diameter and DBH of the forest site over years (the left part in blue representing pines and the right part in red representing poplars)

图5. 胸径测量比例变化

Image 5. The percentage of measurable DBH over years

林地情况说明 Forest Description

图6. 林地航拍照片,2023.10.23

Image 6. Ariel photo of the forest, October 23, 2023

图7. 林地地面照片,2023.10.23

Image 7. Ground photo of the forest, October 23, 2023

杨树和松树生长旺盛,底部杂枝较多,树行清晰,存在少量缺损情况,由于降雨较多,地面植被较丰富,枯落物的积累也较厚。

The poplars and pines grew very strong, and there were branches cumulated on the bottom of the trees. The tree rows were very clearly seen in the site, with only a few absences of trees in the rows. Due to the sufficient rainfall, the vegetation on the ground was abundant. Thick layers of dead branches and leaves were cumulated on the ground.

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