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本文探讨了不同密度群体结构下，地膜甜菜光合及呼吸作用的日变化、生育中后期光合、呼吸作用的变化及与产量和经济性状间的相关性。结果表明：低到中等密度下（４５０００～７５０００株／ｈｍ２）群体光合、呼吸作用日变化为双峰曲线，高密度下（１０５０００株／ｈｍ２）为单峰曲线。中密度至高密度下，群体表观光合强度和呼吸强度日变化均为单峰曲线。密度越大，随生育期推进，表观光合强度下降越明显，而净光合强度则大幅度降低。相关分析表明，地膜甜菜群体光合、呼吸作用与甜菜个体生长相关性较好，而与含糖率、产糖量间相关性较差，与地上部生长相关性较好，而与根部生长相关性较差。
In this paper, the diurnal changes of photosynthesis and respiration of mulched beet and the changes of photosynthesis and respiration during the middle and late growth period were studied under different density population structure, and their correlations with yield and economic traits. The results showed that the diurnal variation of photosynthesis and respiration of the population from low to medium density (45000 ~ 75000 plants / hm2) was a double peak curve, and the highest density (105000 plants / hm2) was a single peak curve. Under medium density to high density, the diurnal changes of apparent photosynthetic intensity and respiration intensity were all single peak curve. The greater the density, with the promotion of growth period, the apparent decrease in apparent photosynthetic intensity, while the net photosynthetic intensity was significantly reduced. Correlation analysis showed that the photosynthesis and respiration of mulched beet populations were related well with the growth of sugarbeet individuals, but had a low correlation with the sugar content and sugar content, but had a good correlation with the growth of shoots, while the correlation with the growth of roots Poor.