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首页> 外文期刊>Acta Horticulturae >Effect of plant density on biomass yield of Cynara cardunculus
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Effect of plant density on biomass yield of Cynara cardunculus

机译：植物密度对Cynara cardunculus生物量产量的影响

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摘要

Cynara cardunculus L. is a perennial herb that has been proposed as an energy crop in Mediterranean environments because of its adaptation to dry and hot summers. Plant density is an important factor for biomass production but it is related to water availability; therefore, in water-constrained conditions it should be optimized. In this work the effect of plant density on the production of C. cardunculus is studied at field level in the rain-fed conditions of central Spain. The experiment was conducted under Mediterranean-continental conditions, 430 mm annual rainfall and 3-month dry period, on average. Sowing was carried out beginning autumn by means of a seed driller with 0.80 cm between rows. After one-year establishment, two plant densities werecompared in 1 -ha plots: the standard plant density and a sparse plant density, designed as a double-row system; it was achieved by lifting two out of four crop rows. Treatments were evaluated for plant density, stalk density, number of heads, plant height, biomass production and dry matter content in summertime. Cynara plants tended to be higher (215 vs. 205 cm) and more productive (0.83 vs. 0.69 kg dm pi1) in double-rows, despite intra-variability. However, this apparent higher growth did not compensate the reduced plant density and finally, the yield in biomass was lower than in the single-row treatment (8 vs. 13 t dm ha1 harvestable biomass). Moreover, a higher proportion of cauline leaves was recorded, which affected the quality of the biomass asa solid biofuel since N content is usually higher in leaves than in stems. Therefore, evidence was provided that the double-row design does not result in yield improvement.
机译：Cynara cardunculus L.是多年生草本植物，因其适应干旱和炎热的夏季而被提议作为地中海环境中的能源作物。植物密度是生物量生产的重要因素，但它与水的可利用性有关。因此，在水受限的情况下，应该对其进行优化。在这项工作中，在西班牙中部雨养条件下，在田间水平研究了植物密度对小菜蛾产量的影响。该实验是在地中海大陆条件下进行的，平均年降雨量为430 mm，干燥期为3个月。播种是在秋季开始时，使用播种机，行间间距为0.80厘米。建立一年后，在1公顷的土地上比较了两种植物密度：标准植物密度和稀疏植物密度（设计为双行系统）;这是通过将四行作物中的两行提升来实现的。在夏季评估处理的植物密度，茎秆密度，头数，植物高度，生物量生产和干物质含量。尽管存在内部变异性，但Cynara植物在双行种植中往往更高（215 vs. 205 cm）和更高的生产力（0.83 vs. 0.69 kg dm pi1）。但是，这种明显的高生长并不能弥补植物密度的降低，最后，生物量的产量低于单行处理（8吨vs. 13 t dm ha1可收获生物量）。而且，记录的茎生叶的比例更高，这影响了作为固体生物燃料的生物质的质量，因为叶片中的氮含量通常高于茎中的含量。因此，提供的证据表明双行设计不会提高产量。

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