不同密度板栗林分产量分化机理

A Study on the Differentiation Mechanism of Yields in Different Density Stands of Chestnut

通过对江苏省宜兴市茗岭乡４种不同密度的（４ｍ×３ｍ、３ｍ×２．５ｍ、３ｍ×２ｍ、２ｍ×１．５ｍ）８年生板栗密植园树体生长发育、光能分布规律、光合生产能力、栗实产量和品质特征的系统分析，研究了板栗密植园的产量分化机理。结果表明：栽植密度显著影响板栗树冠内的光能分布和利用水平，制约树冠叶群的光合生产能力，从而进一步影响树体生长发育状况，最终表现出栗实产量的差异。但栽植密度对栗实品质无显著的影响。

To understand the differentiation mechanism of yields in different densities stand of Castanea mollissima, the growth, light distribution, photosynthetic production, the characteristics of fruit yield and quality in the 8_year_old trees in four different high densities (4m×3m,3m×2.5m,3m×2m,2m× 1.5m ) orchards of chestnut were studied in Yixing, Jiangsu province. The results showed that the diameter of canopy was reduced, the layer of green leave rised, the thickness of canopy was decreased and volume of canopy was reduced with the density increased; The distribution and utilization of photosynthetically active radiation (PAR) in different layers of chestnut canopy were remarkably affected by its planting density, which had a further influence on photosynthetic production of the tree and finally the fruit. But, there was no evident difference of the fruit quality of plants in different density chestnut stand, which may be related to the special biological characters of chestnut.