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cje ›› 1986, Vol. ›› Issue (3): 18-22.

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Preliminary Study on the Community-Structure of Grops in the North-China Plain

Dong Zhenguo   

  1. Institute of Geography, Academia Sinica
  • Received:1985-03-11 Online:1986-06-10

Abstract: Principal conclusions in this study can be shown as follows:1.Winter wheat:when its yield is higher than 7500kg per ha,the period in which leaf-area index goes beyond 4.5 from-jointing stage to mulk stage is more than 40 days.2.Paddy rice:because of the leaf's inclination of this community is bigger in general,the optimum leaf-area index can be determined to be about 6.0.

Key words: Plant, Ecotype, Photosynthesis, Stoma resistance, Leaf water content