林地基本信息 Basic info
位置 Location：内蒙古通辽市科尔沁左翼后旗双胜镇新建村Xinjian Village, Shuangsheng Town, Keerqinzuoyihou Qi, Tongliao City, Inner Mongolia
面积 Area：961亩 / 64 hectares
树种 Species：杨树 Poplars
图 1. 2021-1林地轮廓图
Image 1. Plot 2021-1 skeleton map
2021-1林地位于内蒙古通辽市科尔沁左翼后旗双胜镇新建村，系MTP与当地村民合作实施的防护林工程。该地块选址于辽河沿岸村庄南侧荒地，通过营造东西向林带分割大面积农田，有效阻断春冬季风蚀危害。鉴于地势平坦且近水源，造林树种优选速生杂交杨，兼具生态防护功能。
In 2021, cooperating with villagers of Inner Mongolia Korqin Zuoyi Houqi Shuangsheng Town, MTP contributed to the ecological restoration in in one barren land. The site was located near the Liao River and on the south of the village, dividing a large area of farmland on the east and west sides, and blocking the wind erosion in spring and winter. Since the terrain is flat and close to the river, the main afforestation species are mainly hybrid poplars that grow fast, which also has ecological protection functions.
图2. 2021-1林地保存率年际变化
Image 2. Inter-annual variability of the survival rates
2022年汛期，通辽地区遭遇持续强降水，导致该地块局部发生内涝，部分林木因长期积水引发根系窒息死亡。对此，项目在2023年度秋季和2024年春季对该林地进行了大面积补植，总体保存率恢复至90%。然而2025年该区域再度发生内涝灾害，局部区域林木保存率呈现显著下滑趋势。
In the summer of 2022, there was continuing heavy rainfall in Tongliao. The trees were damaged and died after being flooded for a long time. In the fall of 2023 and spring of 2024, the forest was replanted, and the survival rate of Plot 2021-1 in 2024 was improved to 90%. However, in 2025, the forest was hit by flooding again, and the survival rate in some areas showed a significant downward trend.
图3. 2021-1林地生长数据
Image 3. The growth data of Plot 2021-1
2025年度全林地抽样调查选取了6个样点，各样点保存率具体如下图。观测数据表明，林地保存率下降主要源于1号与4号样地的大面积林木死亡。该区域需持续观察水位动态，精准评估内涝复发风险，并据此优化抚育方案（如调整排水设施或补植耐涝物种）。
The sampling survey conducted in 2025 covered six sample sites, with specific survival rates for each shown in the image below. The data indicates that the decline in the survival rate primarily stems from large-scale tree mortality at Sample Sites 1 and 4. In these areas, it is essential to continuously monitor water level dynamics and accurately assess the risk of recurring waterlogging. These findings should be used to optimize nurturing plans, such as adjusting drainage facilities or replanting with flood-tolerant species.
图4.各样地保存率
Image 4. The survival rates in different sample sites
林地内苗木死亡具有明显的局域性与事件驱动特征（2022&2025年内涝）。其余区域苗木生长态势良好，2021年定植的杂交杨尤为显著。整体而言，该林地正处于森林蓄积量快速积累阶段。为了更直观的体现林地的差异，将测量杨树的树高值进行了总结如下：
The seedling mortality in Plot 2021-1 showed distinct localized and event-driven characteristics (specifically the waterlogging events of 2022 and 2025). In other normal areas, the seedlings were thriving, with the hybrid poplars planted in 2021 showing particularly remarkable growth. Overall, the forest is in a stage of rapid accumulation of growing stock. To provide a more intuitive representation of these localized variations, the tree height values for the poplars are summarized as follows:
图5. 2021-1林地树高分布图(单位：m)
Image 5. The tree height frequency distribution of Plot 2021-1（Unit：m）
从其中可以看出，林地树高分布高度离散：
补植苗木（2023-2024年）：树高集中分布于2.05米以下区间，其中截干处理（保留主干高度≤1.5米）占比达48%，此措施通过抑制顶端优势，优先促进杨树根系发育与木质部增粗。
存活苗木（2021-2022年）：树高分布离散，生长差异显著，区间跨度2-8.85米。
As indicated, the tree height distribution across the forest is highly discrete:
Replanted Seedlings (2023–2024): Heights are concentrated in the range below 2.05 m. Among these, 48% underwent truncation treatment (with main stem heights ≤ 1.5 m). This measure aims to suppress apical dominance, prioritizing root system development and xylem thickening in the poplars. Established Seedlings (2021–2022): The height distribution is highly dispersed with significant growth variations, spanning a range from 2.0 to 8.85 m.
受辽河汛期水文效应与2023年夏季持续性降水叠加影响，项目区道路系统长期处于通行阻滞状态。在此条件下，团队仍于2023年秋季至2024年春季窗口期完成全域补植作业。至2025年夏季，局部内涝复发，加之该地块属农田退耕还林地，次生演替过程中的禾本科、菊科植物盖度显著提升，形成植被竞争压力。
Impacted by the synergistic effect of the Liao River flood season and persistent rainfall in the summer of 2023, the road system within the forest remained impassable for an extended period. Despite these constraints, the MTP completed full-scale replanting operations during the window between autumn 2023 and spring 2024. By the summer of 2025, localized waterlogging recurred. Furthermore, as the plot was originally farmland, the coverage of Poaceae and Asteraceae plants during secondary succession had increased significantly, creating substantial competitive pressure on the seedlings.
图6. 林地航拍图，2025.10.23
Image 6. The aerial photo, October 23, 2025
图7. 早期栽植的杨树树行，2025.10.23
Image 7. The tree rows of early planted poplars, October 23, 2025
图8. 水淹后的树行（左）&杂草过密的树行（右），2025.10.23
Image 8. Tree Rows after flooding (left) & Overgrown weeds in tree rows (right) , October 23, 2025
综上所述，该林地立地条件好，补植质量也较好，林地整体生长较乐观。但依旧处于林地初植期，相对脆弱。在客观因素上，林地依旧存在内涝风险，过密的杂草也需要进行相应的除草抚育。
In summary, the forest is in good condition, the quality of replanting is also good, and the overall growth of the forest is optimistic. However, it is still in the initial planting period and relatively fragile. In terms of objective factors, the forest is still at risk of waterlogging, and the dense weeds need to be weeded and nurtured.
