Growth Analysis and Responses of Cowpea (Vigna Sinensis (L.) Savi Ex Hassk.) and Redroot Pigweed (Amaranthus retroflexus L.), Grown in Pure and Mixed Stands, to Density and Water Stresses
Growth Analysis and Responses of Cowpea (Vigna Sinensis (L.) Savi Ex Hassk.) and Redroot Pigweed (Amaranthus retroflexus L.), Grown in Pure and Mixed Stands, to Density and Water Stresses
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纯林和混合林中豇豆 (Vigna Sinensis (L.) Savi Ex Hassk.) 和红根猪草 (Amaranthus retroflexus L.) 的生长分析和对密度和水分胁迫的响应
DOI：
10.2174/1874840601003010021
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
K. N. Biftu
中科院分区：
文献类型：
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作者：
J. Qasem;K. N. Biftu
研究了水分胁迫和种植密度对豇豆（Vignasinensis（L.）Savi ex Hassk）和反枝苋（Amaranthus retroflexus L.）在温室和田间条件下，研究了纯林和混交林的生长情况。结果表明，生长初期水分胁迫降低了豇豆的株高、地上部干重、叶面积、叶片干重和角果干重，降低了豇豆的花序干重。后屈肌两个物种的影响是更明显的，在高种植密度作为一个严重的种内竞争的结果。在纯林中，豇豆比A.卷须对生殖器官发育的影响更为明显。生长分析表明，叶面积是最具描述性的变量在两个物种的地上部干重和总干重在生长初期的纯林不同时期。A.与豇豆相比，反枝豇豆生长速度快，单位叶面积净同化率高，叶和根分配资源多。结果表明，A.反枝豇豆的竞争力强于豇豆。竞争降低了两个物种的生长和竞争能力，主要是通过减少叶面积在生长早期，但豇豆的效果更为明显。关键词：A.反枝豇豆，豇豆，发育，种间竞争，种内竞争，胁迫反应
The effects of water stress and planting density on the competitive relationships, yield performance, and dynamics in canopy dominance of cowpea (Vigna sinensis (L.) Savi ex Hassk) and redroot pigweed (Amaranthus retroflexus L.) grown in pure and mixed stands were investigated under glasshouse and field conditions. Results showed that water stress at early growth stages reduced plant height, shoot dry weight, leaf area, leaf dry weight and lowered pod dry weight of cowpea, and inflorescence dry weight of A. retroflexus. The effect on both species was more pronounced at high planting densities as a result of severe intraspecific competition. In pure stands, cowpea was affected more than A. retroflexus and the effect was more pronounced on reproductive organs development. Growth analysis of both species grown in pure stands for different periods indicated that leaf area was the most descriptive variable in shoot dry weight and total dry weight of both species at early growth stage. A. retroflexus grew at a faster rate with higher net assimilation rate per unit leaf area and allocated more resources to leaves and roots than did cowpea. Results showed that A. retroflexus was stronger competitor than cowpea. Competition reduced growth and competitive abilities of both species mainly by reducing leaf area early in growth but the effect was more pronounced on cowpea. Keyword: A. retroflexus, Vigna sinensis, development, inter-specific competition, intra-specific competition, stress responses.