林地生长数据 Forest Growth Data
图1. 林地生长数据
Image 1. Forest Growth Data
林地保存率出现过大幅度下降，在最近几年基本稳定，保持在60%以上。该林地栽植的全部为樟子松，生长速度较慢，生长周期也较长。树高的均值相对杨树低很多，其增长幅度有所增大，松树进入了快速增长阶段。胸径和地径均值的增幅显著。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。树高达到1.3米的比例快速增加，在近两年增速较慢。
The preservation rate of the plot had been declined dramatically from 2011 to 2015, but it kept stable in recent years, above 60%. The plot was all planted with pines. The growth speed was slow and the growth phase would be long. The average height was much lower than poplars that were planted in the same year, but the growing speed was increasing. The pines came to the fast-growing phase. The growing speed of basal diameter and diameter at breast height were significant. The DBH was measured at the 1.3-meter-high point on the trunk. Reaching the 1.3-meter-height was the key factor for the growth of DHB. The percentage of the trees which reached 1.3 meters high was increasing a lot, but slowed down in the recent two years. 综上所述,樟子松的保存情况逐渐稳定，树高、胸径和地径的增长显著，增幅较大，林地整体进入快速增长阶段，但增速差异较大，层次不齐的情况凸显。 In conclusion, the pines were well preserved and stable. The height, basal diameter and DBH had experienced significant growth. The whole forest site entered fast growing phase, but there were some differences among the growth speeds. The unevenness of the growth was obvious.林地情况说明 Forest Description
图2. 林地航拍（2020年9月17日）
Image 2. Aerial photo, September 17, 2020
图3. 松树树行（2019年8月3日）
Image 3. Pines' tree rows, September 17, 2020
