文献类型：期刊文献

英文题名：Light distribution, photosynthetic rate and yield in a Paulownia-wheat intercropping system in China

作者：Li, Fangdong[1] Meng, Ping[2] Fu, Dali[1] Wang, Baoping[1]

通信作者：Li, FD[1]

机构：[1]Chinese Acad Forestry, Paulownia Res & Dev Ctr, Zhengzhou 450003, Peoples R China;[2]Chinese Acad Forestry, Inst Forestry Res, Beijing 100091, Peoples R China

年份：2008

卷号：74

期号：2

起止页码：163-172

外文期刊名：AGROFORESTRY SYSTEMS

收录：;Scopus(收录号：2-s2.0-50249169402);WOS:【SCI-EXPANDED(收录号:WOS:000258653000005)】；

基金：This study was part of a key project of ''research on the optimal design of Paulownia-crop intercropping systems for maximal ecological and economic benefit'' funded by the State Forestry Bureau (formerly the ministry of Forestry), People's Republic of China. We appreciate the valuable advice and assistance from Professor Guoyi Zhou of the Chinese Academy of Sciences and Dr. Yingping Wang of CSIRO, Marine and Atmospheric Research, CSIRO during this study.

语种：英文

外文关键词：intercropping system; Paulownia; wheat yield; photosynthetically active radiation

摘要：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.