春季桑树叶片生长模型探讨

自春季桑树发育的雀口期连续测量桑叶面积,结果表明:随着气温、地温的升高,春季后期桑树叶片的生长量显著大于春季前期生长量,且3个供试现行栽培品种间存在明显差异,两阶段均以农桑14号的生长较好,鲁桑7946与育71-1间无统计学意义。分析认为叶面积与有效气温积温、10 cm有效地温积温间的回归关系宜采用Richards或Gompertz模型,与生长日顺的回归关系可用Richards或Logistic模型。由模型解析结果知,农桑14号品种出现第1拐点时间最早,但快速生长持续时间较短,只有8.13~8.63 d;育71-1品种快速生长持续时间最长,达10.33 d。依据以上研究结果还建立了叶面积与叶片鲜质量间的回归模型,其中农桑14号单独建模。

Research on the Growth Model of Mulberry Leaves in Spring

The area of mulberry leaves were investigated at different growth stage in spring in this paper.The results showed that the growth increment of mulberry leaves in the late spring was larger than that in the early spring due to the increase of air temperature and ground temperature.Moreover,the difference of the growth increment of mulberry leaves was obvious among the present mulberry varieties,that is,Nongsang 12 was better than Lusang 7946 and Yu 71-1.The statistical results showed that the area of mulberry leaves had a relationship with the effective accumulation air temperature and the effective accumulation temperature at a height of 10 cm above ground level described as Richards model or Gompertz model,and a relationship with the growth date described as Richards model or Logistic model.Furthermore,the regression model was developed to describe the correlation between the area and the fresh weight of mulberry leaves.