【摘要】 研究水分对白三叶(TrifoliumrepensL.)生长发育的影响,结果表明:水分处理影响白三叶的生长发育进程,导致 生育期延长,冠层高度、匍匐茎密度和叶面积减小,可育节数、茎叶比及种子产量增加;水分胁迫程度越大,匍匐茎密度越 小,可育节数越多;各处理地上部干物质积累均呈“S”型增长,水分胁迫增加,积累速度减缓;地下部干物质积累呈不同规 律;干旱胁迫越大,单位面积干物质中花的比例越大,对照在收获时花的比例达到总干物质的22.72%;轻度和中度水分 胁迫降低叶的比例,分别为21.76%和19.85%,促进种子产量增加,分别为44.97和43.63g/m2。更多还原

【Abstract】 A study of the effect of irrigation to the growth of white clover shows that different water treatments influence the growth of the plant at various degrees. Water-stress treatments lead to lengthening of the plant growth period, diminishing of the canopy height, stolon density, and the leaf size, while increasing the number of reproductive nodes, the ratio of stem to leaf, and the seed yield. The heavier the water stress, the thinner is the stolon density and the more numerous are the reproductive nodes. Under all the five treatments that are adopted, the accumulated aboveground dry matter increases and grows curly in the shape of the letter "S". With increasing water stress, the accumulation of the aboveground dry matter gradually slows down. Contrary to the aboveground dry matter, the underground dry matter accumulates in a different trend. The lesser the soil water content, the higher the percentage of flowerheads per unit area. With the control, the percentage of flowerheads at harvest time reaches 22.72% of the total dry matter. Under the treatment of light or medium water stress, the percentage of leaf diminishes to 21.76% or 19.85% of the total, while the seed yield increases to 44.97 g/m~2 or 43.62 g/m~2 respectively.更多还原