# 2021亚太赛数学建模C题思路：生态保护的建设和对环境影响的评估Construction of Ecological Conservation and Assessment of Its Impact

## 2021年APMCM亚太地区大学生数学建模竞赛【C题：生态保护建设及其环境影响评价】赛题思路

1、塞罕坝在抵御风沙、保护环境、维持生态平衡和稳定等方面发挥了重要作用。请选择合适的指标，收集 相关数据，，构建塞罕坝对生态环境影响的评价模型，以定量评价塞罕坝修复后对环境的影响，即比较分析塞罕坝修复前后的环境状况。

2、赛罕坝林场的恢复对北京抵御沙尘暴发挥了重要作用。请选择合适的指标，收集相关数据，建立数学模型，评估塞罕坝对北京抗沙能力的影响，定量评估塞罕坝在北京抗沙尘暴中的作用。

3、假设我们计划将塞罕坝的生态保护模式推广到全国，请建立一个数学模型并收集相关数据，以确定中国哪些地理位置需要建设生态区（即生态保护区），并确定要建设的生态区的数量或规模；此外，评估其对实现中国碳中和的目标的影响。

4、中国的赛罕巴生态保护模式为亚太地区树立了榜样。请从亚太地区选择另一个国家建立数学模型并收集相关数据，然后讨论该国哪些地理位置需要建设生态区（即生态保护区），以及确定要建设的生态区的数量或规模；此外，评估其对吸收温室气体和减少碳排放的影响。

5、请向亚太数学建模竞赛组织委员会（APMCM）提交一份非技术性报告，描述您的模型，并提出建设生态保护区的可行计划和建议。

2021年亚太杯C题：Construction of Ecological Conservation and Assessment of Its Impact on Environment

Adhere to the concept that lucid waters and lush mountains are invaluable assets, China insists on respecting for, being harmony with and protecting nature, giving high priority to conserving resources, protecting the environment and letting nature restore itself, implementing sustainable development strategies, improving the overall coordination mechanism in the field of ecological civilization, building an ecological civilization system, promoting the transformation of economic and social development toward comprehensive green growth and building a beautiful country. With the help of the Chinese government, China’s Saihanba Tree Farm has recovered from the desert and has now become an eco-friendly and green farm with the stable sand prevention function.

Since 1962, 369 young people with an average age under 24 have come to this wasteland filled with yellow sand. From then on, they dedicated their lives here, advanced wave upon wave, to planting seeds in the sand and planting green in the crevices of the stones, like nails fastening millions of acres of forest on the wasteland. Planting trees to fix the sand and conserve water sources, they build a green barrier to block wind and sand. Today, the forest coverage in Saihanba area has reached 80%. It supplies Beijing and Tianjin with 137 million cubic meters of clean water each year, sequesters 747,000 tons of carbon, and releases 545,000 tons of oxygen.

With over a half century’s struggle, the world’s largest artificial forest was built on the earth of Saihanba. Expanding afforestation of 1.12 million mu with more than 400 million trees, the builders created a green sea on the plateau wasteland which is 400 kilometers north of Beijing.

On the one hand, there is the historical mission that “civilization will develop followed with zoology thriving”. On the other hand, there are new issues encountered on the road of green development. Therefore, Saihanba people now have a higher goal, which is to restore the ecology. Since the 18th National Congress of the Communist Party of China, they have successively launched three major projects, namely, afforestation, natural improvement of artificial forests, and near-naturalization cultivation of natural forests. They have tried to make artificial forests closer to natural ones.

1. Saihanba plays an important role in resisting wind and sand, protecting environment, maintaining ecological balance and stability, etc. Please select appropriate indicators, collect relevant data, and build the evaluation model for the impact of Saihanba on the ecological environment, in order to quantitatively evaluate the impact on the environment after the restoration of Saihanba; that is, to comparatively analyze the environmental conditions before and after the Saihanba restoration.

2. The restoration of Saihanba Tree Farm has played an important role in resisting sandstorms for Beijing. Please select appropriate indicators and collect relevant data to build a mathematical model for evaluating the Saihanba’s impact on Beijing’s ability on sandstorm resistance, and quantitatively evaluate Saihanba’s role in resisting sandstorms in Beijing.

3. Suppose we plan to extend the ecological protection model of Saihanba to the whole country, please build a mathematical model and collect relevant data, to determine which geographical locations in China need to build ecological areas (ie. Ecological Reservation), and fix the number or scale of ecological areas to be built; moreover, to evaluate its impact on achieving China’s carbon neutral target.

4. China’s Saihanba ecological protection model has made an example for the Asia-Pacific region. Please choose another country from the Asia-Pacific region to establish a mathematical model and collect relevant data, and then discuss which geographical locations in this country need to build an ecological area (ie. Ecological Reservation), as well as determine the number or scale of ecological areas to be built; moreover, to evaluate its impact on absorbing greenhouse gases and mitigating carbon emissions.

5. Please write a non-technical report to the Asia-Pacific Mathematical Contest in Modeling Organizing Committee (APMCM), describing your models, and proposing feasible plans and suggestions for building ecological reservation.

Tips: In the process of building the models, you can consider condition of the existing ecological forests in China and other Asia-Pacific regions; the requirement of growth environment for different trees (that is, the specific area for certain tree); how to balance the layout of ecological forest land, economic development land and industrial land; and whether the aimed geographical area has enough land available to develop the ecological reservation.

Reference: http://lycy.hebei.gov.cn/shb/show_article.php?id=5876