Studies on Relationship Between Canopy Respiration and Photosynthesis in High Yield Winter Wheat

doi:10.3321/j.issn:1000-7091.1989.04.002

Abstract

Abstract: Experiment results showed that the change in the canopy respiration rate(CRR)of winter wheat was a single peak curve through the whole growth period. Maximum values of CRR occurred before or after the anthesis stage. The value of CRR was greater and the maximum value emerges earlier and decreases faster in the high density population than in the low density population. Daily changes of CRR were affected by temperature. The ratio of CRR to the canopy photosynthesis rate(CPR)varies in accordance with the growth stage, variety and density. The jointing-booting and the middle-period filling-maturing periods are two high ratio periods. The mean value of CRR/CPR in the whole growth stage is 31.4%. The CRR/CPR ratio of the low density population is lower than the high density population. The number of tillers per mu, the leaf area index and the dry matter weight exhibited a significant correlation with CRR before the booting stage. The correlation of CRR with yield was positive but not significant. Decreases in the number of basic seedlings could decrease the CRR/CPR ratio, and are favourable to grain yield increases.

Key words: Winter wheat, Canopy respiration, Canopy photosynthesis Grain yield

Dong Shuting, Yu Songlie, Qi Xinhua. Studies on Relationship Between Canopy Respiration and Photosynthesis in High Yield Winter Wheat[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1989, 4(4): 6-10. doi: 10.3321/j.issn:1000-7091.1989.04.002.

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