2010-1 林地情况说明

2019年秋季，负责该林地抚育的六家子林场向我们通报，该林地出现了大规模的病虫害，需要进行相应的采伐更新。于是在2019年10月11日，我们对该林地进行了抽样检查。共随机抽样1532株，其中轻微或无病变组织（初步判断为冠瘿病）的杨树为513棵，中等至严重病变组织的杨树为1019棵。也就是说，林地内67%的杨树出现了较为严重的病虫害。

In the autumn of 2019, Liujiazi Tree Farm informed us that there had been large-scale tree pest and disease breakout in the forest where our 2010-1 forest site was located. It required emergency cutting down and later replanting. We sampled and examined the trees in the site on October 11. Among the randomly-sampled 1532 trees in the site, 513 trees had mild symptom or none, but the left 1019 trees all suffered moderate to severe tree disease (preliminarily estimated to be Agrobacterium tumefaciens). 67% of poplars in the forest were in serious condition.

根据《低效林改造技术规程LYT1690—2007》中对于低效林认定标准：

4.2.2遭受严重病虫、干旱、洪涝及风、雪、火等自然灾害，受害死亡木（含濒死木）比重占单位面积株数20%以上的林分（林带）。

我们基本认同该林地可以划为低效林，进行相应的采伐及补植。

之后根据《森林病虫害防治条例》，市一级林业部门对林地进行了病虫害判定。鉴定书如下图所示。为了防止病虫害的传播，进行了大面积采伐处理。

According to Low-Function Forest Improvement Technology Regulations LYT1690-2007, low-function forest is regarded as follows:

4.2.2 By suffering severe pest attack, drought, floods, or natural disaster such as heavy wind, snow or fire, the affected dead trees, including dying trees take up over 20% of the overall stands.

In this case, the forest was categorized into low-function forest and required cutting and replanting.

The city-level Forestry Bureau evaluated the forest regarding pest and disease according to Forest Disease and Insect Pest Prevention and Control Regulations. The Evaluation document is showed below. To prevent the disease from spreading, the tree farm executed the cutting work.