Evaluation of Methane Emission Reduction Potential of Water Management and Chinese Milk Vetch Planting in Hunan Paddy Rice Fields

In order to explore the methane reduction potential with two scenarios of water management and Chinese Milk Vetch return, we calculated emissions Hunan Province rice fields in 2019 using SECTOR tool based on Excel released by International Rice Research Institute. Thus, preliminarily established an agricultural carbon monitoring, reporting, verification (MRV) system. The results showed that: (1) There was significant spatial variation fields, higher both south north lower east west. Late main contributor emissions, cities Changde, Hengyang, Yueyang, Shaoyang were high-emission areas due differences planting types areas. Compared flooding (1275.75 Gg), optimized measures (mid-drainage AWD irrigation) reduced 29~45% (905.79 701.66 Gg, respectively). (2) Under same nitrogen input conditions, compared a solely straw return (375.24 combining green manure could partially reduce from super hybrid (327.63 Gg). control fertilizers (404.28 rates winter-planted Vetch, straw, incorporation 7.19%, 13.01%, 18.96%, respectively. Based scientific accounting tools, preliminary MRV system for field established. national demand reducing fertilizer use increasing efficiency, equal organic amendments effectively contribute development green, low-carbon, high-quality agriculture.