Adjustable isotope labeling device for plant photosynthesis

The invention provides an adjustable isotope labeling device for plant photosynthesis. The device is characterized in that organic glass 1 and a sealing ring 2 form an external circulating leaf chamber 3, the external circulating leaf chamber 3 is communicated with a carbon dioxide absorption tank 11 through an organic hose 13, the external circulating leaf chamber 3 is communicated with a circulating pump 4 through an organic hose 5, the external circulating leaf chamber 3 is fixed on a multi-angle fixing frame 6 through a metal supporting rod 7, a carbon dioxide concentration detection probe 8 is arranged in the external circulating leaf chamber 3 and is communicated with a carbon dioxide detector 10 through an optical fiber 9, the carbon dioxide absorption tank 11 is communicated with the circulating pump 4 through an organic hose, a carbon dioxide supply pipe 12 is communicated with the organic hose 5 through a three-way electronic control valve, carbon dioxide supply is guaranteed by electronically contr