JapanFlux2024 JP-Hc3 Hachihama Experimental Farm: Double Crop

Paddy fields are a characteristic agricultural crop in Asia, accounting for 54% of the total arable land area in Japan.The carbon budget of paddy ecosystems is greatly influenced by irrigation water management, compost application, tillage, and post-harvest residue disposal.Among them, irrigation water management is a unique cultivation management for paddy fields, and decomposition of organic matter under anaerobic soil conditions promotes CH4 production.In addition, Asian paddy fields are characterized by mono-cropping (one crop per year) and double cropping (wheat and rapeseed as a back crop),The differences in cropping systems also contribute to the carbon budget.Differences in cropping systems also have a significant impact on the carbon budget.We observed sensible heat, latent heat and CO2 fluxes in a barley-paddy rice double cropping system using the eddy correlation method.The observation was conducted in a privately owned barley-paddy rice double cropping field in Tamano City, Okayama Prefecture.It is 1.5 km away from Hachihama Farm, which is affiliated with the Faculty of Agriculture, Okayama University, in a straight line.The measurements were conducted when the principal investigator belonged to Faculty of Environmental Science and Technology, Okayama University.

稻田是亚洲典型的农业用地类型，其面积占日本总可耕地面积的54%。稻田生态系统的碳收支受灌溉水管理、堆肥施用、耕作措施及收获后残余物处置的显著影响。其中，灌溉水管理是稻田特有的栽培管理手段，厌氧土壤环境下的有机质分解会促进CH4（甲烷）生成。此外，亚洲稻田以单作（一年一季）和复种（以小麦、油菜为后季作物）为典型特征，种植制度差异同样会影响碳收支。种植制度差异还会对碳收支造成显著影响。本研究采用涡度相关法，对大麦-水稻复种系统的显热、潜热与CO2通量进行了观测。观测点位设于日本冈山县玉野市一处私有大麦-水稻复种农田，该点位与隶属于冈山大学农学院的八滨农场直线距离仅1.5公里。本次观测开展期间，项目负责人仍任职于冈山大学环境科学与技术学院。