Competition for light between hedgerows and maize in an alley cropping system in Hawaii, USA
Competition for light between hedgerows and maize in an alley cropping system in Hawaii, USA
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DOI：
10.1023/a:1020598110484
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发表时间：
2002-01-01
影响因子：
2.2
通讯作者：
Fownes, JH
中科院分区：
文献类型：
--
作者：
Friday, JB;Fownes, JH
成功的农林系统取决于最大限度地减少树木-作物竞争。在这项研究中，田间试验和模拟模型被用来区分树木作物竞争的光和地下竞争的小巷种植制度。玉米（Zea mays L.）分三个处理定期收获：在遮阳布垂直屏障之间、大叶千斤拔树篱之间（Willd.）我的天，还有玉米利用模拟模型，根据直射光和漫射光、绿篱尺寸和叶面积以及太阳轨迹的测量值，计算玉米截获的辐射。辐射利用效率的计算方法是每单位截获的辐射产生的生物量。玉米生物量和产量在巷道作物和遮阳布处理是最大的中心巷道。绿篱间的谷物产量为3.5 Mg ha（-1）（整条小巷的平均值），显著低于遮阳布处理（7.4 Mg ha（-1））或单一玉米处理（7.7 Mg ha（-1））。间作玉米所截获的光大约是单作玉米所截获的光的一半。遮阳布比树篱遮挡的光线少，因为它没有明显的宽度。三个处理的辐射利用效率为0.75 g mol（-1）PAR，处理之间没有显着差异。树木与作物的竞争主要是为了争夺光照。
Successful agroforestry systems depend on minimizing tree-crop competition. In this study, field experiments and a simulation model were used to distinguish between tree-crop competition for light and belowground competition in an alley cropping system. Maize (Zea mays L.) was harvested periodically in three treatments: between vertical barriers of shade cloth, hedgerows of Flemingia macrophylla (Willd.) Merr., and sole maize. Radiation intercepted by the maize was calculated using a simulation model based on measured values for direct and diffuse light, hedgerow dimensions and leaf area, and solar trajectory. Radiation use efficiency was calculated as biomass production per unit of intercepted radiation. Maize biomass and yield in both the alley crop and the shade cloth treatment were greatest in the center of the alleys. Grain yield between hedgerows was 3.5 Mg ha(-1) (averaged across the alley), significantly less than in the shade cloth (7.4 Mg ha(-1)) or the sole maize (7.7 Mg ha(-1)) treatments. Light intercepted by the maize in the alley crop was about half that intercepted by the maize in the sole crop. The shade cloth intercepted less light than the hedgerows because it did not have an appreciable width. Radiation use efficiency in the three treatments was 0.75 g mol(-1) PAR and did not differ significantly among treatments. Tree-crop competition was overwhelmingly for light.