林地生长数据 Forest Growth Data
图1. 林地生长数据
Image 1. Forest Growth Data
2018年，MTP项目与内蒙古通辽市科尔沁左翼后旗林业局合作，在3个沙荒地进行了生态修复，造林树种包括樟子松、五角枫、柳树、黄菠萝、小叶锦鸡儿等，其中主体造林以樟子松为主，道路防风带以五角枫等为主，内部沙化区域栽植了部分小叶锦鸡儿。其中，穿插了部分柳树、黄菠萝等。
In 2018, cooperating with the Forestry Bureau in Keerqinzuoyihou Qi, Tongliao, MTP contributed to the ecological restoration in three plots of sandy land by planting a mix of Pinus sylvestris L. var. mongolica Litv. (scotch pines), Acer mono (maples), willows, phellodendron amurens and caragana microphylla Lam. The main species is scotch pine. Maple trees were planted as the windbreak. While caragana were planted in some part of the desertified areas. Among them, a few willows and p. amurenses spread out over the plot.2022年度2018-1林地的总体保存率为90.25%。2018年栽植的三块林地近五年的保存率对比如下图，可以看出2018-1林地的保存率的变化不大，保持着较高的水平。该林地立地条件较差，地势起伏较多，部分区域沿路，所以栽植和抚育难度较低、质量较好。
The 2018-1 forest site’s overall survival rate in 2022 was 90.25%. The five years' survival rates of three plots are demonstrated in the figure below. It shows that the survival rate of 2018-1 plot did not change much over years, and the forest maintained a high preservation status. The forest site’s terrain conditions are not good, as the terrain is quite rugged. The site is beside the roads on some sides, making it easier to carry out the planting and maintenance work.
图2. 2018年各林地五年保存率对比
Image 2. Survival Rates of Three Plots in Five Years
该林地采用的是大苗木低密度模式栽植，松树至少为4年生苗木，树高、地径、胸径等指标均值都较高,下图为三块林地树高均值变化图，可以看到树高均值均在增长，而且增幅显著。林地内的樟子松生长较往年加快了。
The forest was planted with high-density large seedlings, and the planted pines were at-least-four-year-old seedlings. The average height, basal diameter and DBH were all rather high, and the changes of these indicators are shown in the below graph. It shows that the average tree height was increasing, and the speed of increase was great. The pines in the forest sites were growing faster than previous years.
图3. 树高均值变化对比
Image 3. Average Tree Heights in Five Years
松树的生长相对缓慢，为了直观的看生长速度，将五年的均值进行对比,如下方三张图片所示。可以看到，地径均值和胸径均值的变化和树高类似，在本年度的继续增大，增长幅度也较显著。树高大于1.3米的比例也大幅度上升。林地整体的生长相对健康。
The pines were growing rather slowly. To get a better understanding of its growth, we compared the growth index of trees in the below three graphs. They show that the changes of average basal diameter and DBH were like the tree height. The growth continued to rise this year and the growth speed was obvious. The percentage of trees which are above 1.3 meters was significantly increasing. The overall status of the forest sites was healthy.
图4. 地径均值变化对比
Image 4. Average Basal Diameter in Five Years
图5. 胸径均值变化对比
Image 5. Average Diameter at Breast Height in Five Years
图6. 可测量胸径比例变化对比
Image 6. Percentage of Measurable DBH in Five Years
林地情况说明 Forest Description
The pines in the forest site was growing very well with strong trunks and plenty of green leaves, and there grows bushes on the bottom of the site. A layer of soil crusts covered some parts of the surface of the ground.
图7&8. 分别摄于2022年8月10日和2023年3月20日
Image 7&8. Photo Taken respectively on August 10, 2022 and March 20, 2023
