林地概况 Forest Basic Information
截至2021年，MTP项目于内蒙古通辽市共栽植39块林地，绿化面积达36558.15亩（24.37平方公里），栽植各树种共计2621308棵。其中，2021年新增一块林地，即2021-1，林地面积为961亩。
To date, MTP has successfully planted 2,621,308 trees on 39 forest plots, covering an area of 36,558.15 Mu (24.37 km2) in Inner Mongolia. In 2021, a new plot of 961 Mu was planted, marked as plot 2021-1. More details are given in the graph below. (1 Hectare=15 Mu)
图1. 历年栽植面积变化
Fig. 1 Planting Areas of Each Year
栽植树种 Type of Trees
截止2021年，栽植树种8种，分别为：杂交杨树（通林5，哲林4，白城杨，小黑杨等）1年和2年生裸根苗；文冠果播种苗；五角枫播种苗；樟子松3年生容器苗；榆树2年生苗；柠条（1年生容器苗），柳树2年生苗，黄菠萝2年生苗以及云杉3年生苗。 其中，杨树和樟子松依旧为主要造林树种，分别达总造林数量的54%和37%，其他树种占比不足10%。
To date, we’ve planted 8 types of tree species in MTP forests, including 1-year-old and 2-year-old hybrid poplar bare-root seedlings, yellow horn seedlings, maple (Acer Mono) seedlings, 3-year-old container pine tree seedlings, 2-year-old elm seedlings, 1-year-old Caragana Microphylla container seedlings, 2-year-old willow seedlings, 2-year-old Phellodendron amurense seedlings, and 3-year-old spruce seedlings. Poplars and pines made up for the majority of the trees planted, the percentages being 54% and 37% respectively, and other tree species combined less than 10%.
图2. 树种数量对比
Fig.2 Types of trees
林地保存率 Forest Survival Rate
2021年10-11月，我们对2010-2021年期间栽植的21块林地逐一进行了抽样调查，历时15天，测量样地172个，总计测量林木5830棵。测量比例占林木总数量的0.22%。测量的指标包括：保存率、树高、地径、胸径、冠幅、株行距等。调查发现2021年度全林地保存率均值为74.25%。
In October and November, MTP team conducted surveys in 21 forest sites, which were planted from 2010 to 2021. The surveys took 15 days in total, covering 172 sample sites and 5830 tree samples. The sampling ratio was 0.22%. The survey measurements included the survival rate, height, basal diameter, diameter at breast height, crown width and spacing in the rows. Based on our survey results, the overall survival rate of all MTP forests in 2021 was 74.25%.
图3. 历年保存率变化
Fig.3 Survival rates over the years
不同树种对沙地环境的适应能力存在一定差异，大部分树种的保存率均值基本维持在70%左右，是一个相对合理的现象。柳树的适应性较差，不足60%。2021年度各树种保存率存在一定差异，主要树种的保存率具体如下表：
The adaptability of different tree species to sandy environment varies, and the average survival rate of most tree species is basically maintained at about 70%, which is a reasonable phenomenon. The adaptability of willows is relatively poor, with less than 60%. In 2021, the survival rates of various tree species are different, those of major tree species are shown in the following figure:
图4. 主要树种的保存率对比
Fig.4 Survival rates of each type of trees
图5. 2021年度各林地保存率
Fig.5 Survival rates of each plot in 2021
如上图显示，大部分林地保存率均高于60%，基本达到目标预期。
As shown in the figure above, the survival rate of most plots is higher than 60%, basically reaching our expectation.
图6. 林地测量工作照片
Fig.6 Surveying in the plots