沙地云杉苗期生长与干物质生产关系的研究

本文用不同_的模型定量地研究了沙地云杉苗期的生长规律、季节动态及不同生长时期干物质在各器官之间的分配规律。1)1年生幼苗一直保持较高的生长速度,根生长尤为迅速。5年生幼苗在接近生长上限时,增长越来越慢。2)根、茎、叶干物质的生产符合理查德模型;根、茎、叶干重与全株干重之百分比表现出不同的变化趋势,反映了于物质在各器官中的分配规律。3)不同年度各器官的干重变化反映了由于自疏造成的叶的脱落和部分枝的脱落情况。4)各模型的相关系数几乎都达到了极显著的水平。

Relationship between seedling growth and dry matter production of spruce in sandy land

The growth characteristics of Picea mongolica seedling and the seasonal dynamics and distribution pattern of dry matter in its various organs during growing seasons are studied using different models. The results show that 1) the growth rate of annual seedlings, and of their root in particular, is much higher, but five years-old seedlings are near to the upper limit of growth, 2) the dry matter production of root, stem and leaf corresponds to Richards model, and the percentages of them to whole plant are different, which reflects the distribution pattern of dry matter in various organs, 3) the dynamics of dry weight of various organs in different years reflects the state of falling leaves and branches caused by self-thinning, and 4) the correlation coefficients simulated by models are almost at very significant level.