Light distribution,photosynthetic rate and yield in a Paulownia-wheat intercropping system in China |
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Authors: | Fangdong Li Ping Meng Dali Fu Baoping Wang |
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Institution: | (1) Paulownia Research and Development Center, Chinese Academy of Forestry, Zhengzhou, 450003, People’s Republic of China;(2) Institute of Forestry Research, Chinese Academy of Forestry, Beijing, 100091, People’s Republic of China |
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Abstract: | Measurements of photosynthetically active radiation (PAR), leaf photosynthesis, canopy leaf area index (LAI) and crop yield
were carried from flowering to maturity to study the effects of tree shading on crop yield in a Paulownia-wheat intercropping
system in China. We found that the tree shading reduced the amount of incoming PAR within the intercropping system by 22%,
44% and 56% during flowering, grain-filling and maturing, respectively. The amount of PAR intercepted by the wheat crop inside
the intercropping system was 34%, 55% and 68% less than the crop outside the intercropping system during flowering, grain-filling
and maturing. Estimates of PAR-saturated leaf photosynthetic rate were not affected by tree shading, and the differences between
the wheat yield inside the intercropping system and outside the intercropping system can be explained by the difference in
the amount of PAR intercepted. Total grain numbers and grain dry weight per 1000 grains were linearly correlated with the
amount of PAR intercepted during 7 days prior to anthesis and during anthesis and grain-filling, respectively. As compared
with the wheat crop outside the intercropping system, grain numbers and grain dry weight were reduced by 36% and 25%, respectively.
As a result wheat yield inside the intercropping system was 51% lower than that outside the intercropping system. Our results
suggest a much higher reduction in crop yield and much smaller economic gain of the Paulownia-wheat intercropping system than
previous studies on the similar Paulownia-wheat intercropping systems in China. |
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Keywords: | Intercropping system Paulownia Wheat yield Photosynthetically active radiation |
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