## 1 Introduction
On the other hand, due to the deterioration of the ecological environment, the human demand for ecosystem services has gradually increased. According to the Kyoto Protocol (1992) [21], the Paris Agreement (2015) [22], the Green Deal [23], the 14 th Five-Year Plan for National Economic and Social Development of the People's Republic of China [24] and other relevant documents and regulations, achieving carbon neutrality and mitigating global warming has become a world consensus; therefore, the carbon absorption capacity of ecosystems needs to be further strengthened, and it is necessary to explore the factors related to the carbon sequestration capacity of an ecosystem in an ecos spatial network at the macroscopic scale for subsequent top-level planning research work. Net primary productivity (NPP) is the amount of organic matter accumulated by green plants per unit of time and area, namely the part of organic carbon fixed by plants through photosynthesis minus the part consumed by respiration, also known as the net first productivity. It is the main factor in studying the carbon source/sink properties of an ecosystem and an important indicator of the surface carbon cycle. At present, the research on NPP is mostly centered on its relationship with climate and precipitation [25; 26; 27]; however, there is still a gap in research that combines NPP with ecos spatial networks and explores the influence of the topological properties of ecos spatial networks on the carbon sequestration capacity of ecosystems with respect to the relationship between NPP and ecos spatial networks. Inner Mongolia has a vast watershed area rich in natural resources and a very important ecological position. Moreover, the Yellow River flows through the region for 843.5 km, which is an important part of China's ecological barrier [28; 29]. In recent years, the contradiction between economic development and ecological protection in Inner Mongolia hasbecome increasingly prominent. Forest resources, grassland resources, water resources and other resources have been greatly exploited, and ecological and environmental problems have persisted for a long time, leading to a growing shortage of environmental carrying capacity and causing serious impacts on the regional ecological environment. [PERSON] et al. [30] pointed out that the land area subjected to wind erosion and desertification in the arid and semi-arid regions of Inner Mongolia accounted for 64.4% of the total area of the country, which was the most serious desertification area in China; according to [PERSON] et al. [31], the area of degraded grassland accounted for 31.8% of the total area of grassland, and among the five major grasslands, the Horqin grassland, the Ordos grassland and the Ulanqab grassland had basically disappeared. [PERSON] et al. [32] pointed out that due to overgrazing, blind reclamation, and low vegetation cover, Inner Mongolia has the most serious soil erosion in the country; [PERSON] et al. [33] concluded from a survey that due to the expansion of farmland, the forest resources in Inner Mongolia, led by the original forests of the Daxinganling, have been drastically reduced and the modulus of soil wind erosion has increased by 5 million tons. At present, the total carbon emission in Inner Mongolia ranks fourth in China, and the per capita carbon emission intensity is the highest. As the country accelerates the \"carbon peak\", it is especially difficult for Inner Mongolia, with its high energy consumption and high carbon emission. Therefore, this paper took the Inner Mongolia Autonomous Region as an example, extracted the potential ecosspatial network in the region, and calculated the integrity index, degree and degree distribution, clustering coefficients and other complex network topological indices and robustness.