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在北方 (保定 )大田种植条件下 ,对魔芋光合性能进行的初步研究表明 :在 8月初到 9月初的块茎膨大期内 ,魔芋的光合速率变化很大 ,这是由魔芋的生育进程和这期间的生态因素决定的。这期间生态因素对光合速率影响的大小顺序依次为空气相对湿度 (RH)、气温 (T)、CO2 体积分数 ([CO2 ])和光合有效辐射 (PAR) ,其中 ,RH和 [CO2 ]与光合速率呈正相关 ,T和PAR与光合速率呈负相关。不同栽培技术措施对光合速率也有影响 :大块种芋长出的植株与中块的相比 ,大田生长的植株与盆栽的相比 ,受间作玉米遮阴的植株与不遮阴的相比 ,前者光合速率都较高。魔芋光合速率的日变化为双峰曲线 ,中午的强光、高温使光合速率出现低谷。对有利于魔芋光合作用的生态条件和栽培措施也进行了讨论。
Preliminary studies on the photosynthetic properties of Konjak under field planting conditions in northern China (Baoding) indicated that the photosynthetic rate of Konjak varied greatly during the tuber expansion period from early August to early September, which was caused by the growth of konjac The ecological factors of the decision. The order of the impact of ecological factors on photosynthetic rate during this period was air relative humidity (RH), temperature (T), CO2 volume fraction (CO2) and photosynthetically active radiation (PAR) The rate was positively correlated, while T and PAR were negatively correlated with photosynthetic rate. Different cultivation techniques have the same effect on the photosynthetic rate. Compared with the medium-sized Chinese cabbage plants grown in large-sized varieties of taro, compared with the plants without shade, The former photosynthetic rate is higher. The daily change of photosynthetic rate of konjac was a bimodal curve, the noon light and high temperature made the photosynthetic rate low. The ecological conditions and cultivation measures that are favorable to the photosynthesis of konjac are also discussed.