Biodiversity is the basic support to maintain the balance of the earth’s ecosystem, which is closely related to climate change. The essence of climate crisis is biodiversity crisis. In order to cope with and mitigate the accelerated destructive impact of climate change on the global ecological environment, carbon reduction is the only way to go at this stage. This paper systematically combs the relationship between carbon reduction and biodiversity, then elaborates that there is a positive correlation between biodiversity and carbon reduction. Reducing carbon dioxide emissions can be achieved by taking measures such as energy structure transformation, industrial structure adjustment, energy conservation and emission reduction technology innovation. At the same time, we can also explore the potential of ecosystem carbon sequestration to reduce the content of carbon dioxide in the atmosphere. Controlling the content of carbon dioxide in the atmosphere can alleviate the interference and damage of climate change to the natural ecological environment, and play a positive role in biodiversity protection. When combing the literature on the relationship between carbon sequestration and biodiversity, it is found that there is also a connection between forestry carbon sequestration and biodiversity in afforestation, that is, biodiversity plants will isolate more carbon than trees alone in artificial afforestation, and there is a trade-off between carbon and biodiversity.

Accurate simulation of floodpeak and its hydrograph is crucial for flood control and disaster reduction analysis. The selection of rainfall loss and runoff generation model is often critical for flood process simulation. To evaluate the applicability of different rainfall loss and runoff generation models in the Sunshui River Basin in Southwest China, this study constructed three rainfall-runoff modeling schemes (scheme 1: SCS Curve Number method+Snyder Unit Hydrograph method, scheme 2: Initial Constant Rate method+Clark Unit Hydrograph method, scheme 3: Green-Ampt method+SCS Unit Hydrograph method). The HEC-HMS model was used to simulate 15 flood events from 2007 to 2018. The results showed that Schemes 1 and 2 demonstrated satisfactory performance in simulating the flood hydrographs in the study area, with Scheme 1 performing better for single-peak flood events and Scheme 2 performing better for double-peak flood events. In comparison, Scheme 3 exhibited inadequate simulation performance. The findings of this study can provide reference for flood simulation and prediction in similar areas.