Relationship Between Canopied Respiratory Rate and Photosynthetic Characteristics of High-yielding Summer Maize
Dong shuting Hu Changhao Gao Rongqi Wang Qunying (Shandong Agricultural University,Taian 271018)
Experiment results showed that the change in canopied respiratory (CR) rate of summer maize was a single peak curve through the whole growth period. Maximum value of CR rate occurred in anthesis stage. CR rate raised along with the increase of leaf area index (up to 4. 5). CR rate was higher in thick planting density than in thin planting density. The vertical distribution of CR rate was middle 4 leaveshop 4 leaves) bottom 4 leaves in Yedan 13(erectopatent type). CR rate of different plant organs was leaf stemeartassel. The percentage of CR/CP (canopied total photosynthesis)was 30. 64%. Canopied respiratory rate unit dry matter was higher at early growth stage and then decreased until maturity,it's the lowest at mature stage.
【CateGory Index】： S513