板栗光合生理的研究Ⅱ．板栗的光合特性

The studies on Photosynthetic Physiology of Chinese Chestnut Ⅱ. some Photosynthetic Characteristics of Chinese Chestnut Leaves

本文报导了对板栗（Ｃａｓｔａｎｅａｍｏｌｌｉｓｓｉｍａ，Ｂｌ．）部分光合特性的研究。结果表明，板栗是Ｃ_３植物，具有ＣＯ_２猝发现象，依品种不同，ＣＯ_２补偿点４０×１０^（－６）～５８×１０^（－６），光呼吸速率为２．５６～５．２６ｍｇＣＯ_２·ｄｍ~－（２）·ｈ^（－１）；光补偿点为０．８～１．５ＫＩＸ，光饱和点３５～４５ＫＬＸ，光－光合关系也因品种不同而异：金沙油粟、台江大板栗和镇远大板栗为双曲线，而玉屏大板栗为对数函数，浅刺薄壳的光－光合关系更为Ｐｎ＝１．２９０９（１－１．５０００）ｅ^（－０．０２２７Ｉ＋０．０３４１），“滞后期”的长短与品种原产地有关，在１５～３０分钟之间，同化室气体流量、叶龄、叶位对板栗光合强度有一定影响。作者还根据板栗光合特性，对生产上存在的一些技术性问题提出了自己的观点。

Some photosynthetic characteristics of Chinese. chestnut(Castanea mollissima, Bl. )are studied. The results are as following: CO2 outbursts in no-CO2 air stream, and 40×10-6～58×10-6 CO2 compensation points, 2.56-5.26mgCO2·dm-2·h-1 photorespirated rates are observed, which suggest Chinese chestnut is C3 plant. The light compensation points are 0. 8-1. 5KLX, and light saturation points are 35-45KLX.The photosynthetic rates increase with light intensities in a hyperbolic pattern of cultivar Jinshayouli, Taijiangdabanli and Zhenandabanli, typically or most C3 plants while in an exponential function and pn=1.2909 (1-1.5000)e(-0.02271+0.0341) relationship of yupingdabanli and Qianciboke respectively. Photosynthetic ″Delay periods″with 15-30 minutes have something to do with the original zones of cultivars. Air flow rates leaf age and position significantly influence photosynthetic rates of Chinese chestnut. Some suggestions have been proposed according to the photosynthetic characteristics.