Competition indices of common vetch and cereal intercrops in two seeding ratio
Competition indices of common vetch and cereal intercrops in two seeding ratio
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DOI：
10.1016/j.fcr.2006.07.008
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发表时间：
2007-02-01
影响因子：
5.8
通讯作者：
Dordas, C. A.
中科院分区：
文献类型：
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作者：
Dhima, K. V.;Lithourgidis, A. S.;Dordas, C. A.
以野豌豆（Vicia sativa L.）为材料进行了为期2年的田间研究，小麦（Triticum aestivum L.），小黑麦（xTriticosecale Wittmack），大麦（Hordeum vulgare L.），和燕麦（Avena sativa L.）纯林以及其两种常见的用于青贮的箭舌豌豆-谷物混合物，其中上述四种谷物中的每一种以两种播种比例（即，野豌豆：谷物55：45和65：35，基于种子数量）来确定不同物种之间的竞争和每个间作系统的经济性。利用土地当量比（LER）、相对拥挤系数（RCC或K）、侵略性（A）、竞争比（CR）、实际产量损失（AYL）、货币优势指数（MAI）和间作优势（IA）等指标对间作系统进行评价。间作系统中，间作小麦（55：45）和间作燕麦（65：35）的LER和K值较大，说明间作系统具有利用环境资源的优势。AYL也观察到与LER和K相似的趋势。大麦和燕麦的侵略性，CR和部分AYL值大于小麦和小黑麦，而普通箭舌豌豆的相应值低于与大麦和燕麦的混合物比与小麦和小黑麦的混合物。这些结果表明，大麦和燕麦比小麦和小黑麦更有竞争力的合作伙伴，因为普通箭舌豌豆与这两种作物混合时受到的影响更大。最高的MAI和IA值记录为普通箭舌豌豆小麦（55：45）和普通箭舌豌豆燕麦（65：35）混合物，表明这些间作系统是最有利可图的。(c)2006 Elsevier B. V.保留所有权利。
A 2-year field study was conducted using common vetch (Vicia sativa L.), wheat (Triticum aestivum L.), triticale (xTriticosecale Wittmack), barley (Hordeum vulgare L.), and oat (Avena sativa L.) pure stands as well its two common vetch-cereal mixtures for silage with each of the above four cereals in two seeding ratios (i.e., vetch:cereal 55:45 and 65:35, based on seed numbers) to determine the competition among the different species and the economics of each intercropping system. Intercropping systems were assessed on the basis of several existing intercropping indices such as land equivalent ratio (LER), relative crowding coefficient (RCC or K), aggressivity (A), competitive ratio (CR), actual yield loss (AYL), monetary advantage index (MAI), and intercropping advantage (IA). The LER and K values were greater for the common vetch-wheat (55:45) and the common vetch-oat (65:35) mixtures indicating that in these systems, there was an advantage of intercropping for exploiting the resources of the environment. A similar trend to that of LER and K was also observed for AYL. The aggressivity, CR and partial AYL values were greater for barley and oat than for wheat and triticale, whereas the corresponding values for common vetch were lower in mixtures with barley and oat than in mixtures with wheat and triticale. These findings indicate that barley and oat were more competitive partners than wheat and triticale as common vetch was affected more in mixtures with these two crops. The highest MAI and IA values were recorded for the common vetch-wheat (55:45) and the common vetch-oat (65:35) mixtures indicating that these intercropping systems were the most profitable. (c) 2006 Elsevier B.V. All rights reserved.