The Effect of Light on Growth and Dry Matter Allocation Patterns of Alternanthera philoxeroides (Mart.) Griseb.
The Effect of Light on Growth and Dry Matter Allocation Patterns of Alternanthera philoxeroides (Mart.) Griseb.
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DOI：
10.1086/337432
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发表时间：
1984-03
影响因子：
--
通讯作者：
D. Longstreth;Catherine B. Mason
中科院分区：
文献类型：
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作者：
D. Longstreth;Catherine B. Mason
扬子鳄杂草（苋科），在不同的光接收量的栖息地中发现的一种，生长在四个光合光子通量密度（PPFD），以确定PPFD对生物量的生产和分配的影响。经过56天的生长，在最高PPFD（40摩尔m-2天-1）的植物的平均干重大于9倍的植物在最低PPFD（8摩尔m-2天-1）。PPFD处理与第56天的植株干重之间呈线性关系。在PPFD处理中，单株叶面积与单株干重的差异不大;因此，叶面积与单株干重的比值随着PPFD处理的减少而增加。最高PPFD处理产生的植物叶干重与叶面积的比率最高。虽然所有植物的出叶率都是线性的，但在两个最低的PPFD处理中出叶率降低。我们估计，在最低PPFD处理下，PPFD的干重生产效率得到提高。生长所需的最低PPFD估计为5摩尔m-2天-1，每株植物的干物质生产可以增加到最大PPFD收到在美国东南部的无阴影的栖息地。
Alligator weed (Amaranthaceae), a species found in habitats varying in the amount of light received, was grown at four photosynthetic photon flux densities (PPFD) to determine the effect of PPFD on production and partitioning of biomass. After 56 days of growth, the average dry weight of plants at the highest PPFD (40 mol m-2 day-1) was greater than ninefold that of plants at the lowest PPFD (8 mol m-2 day-1). The relationship between PPFD treatment and plant dry weight on day 56 was linear. Among PPFD treatments, leaf area per plant was not as dissimilar as dry weight per plant was; as a result, the ratio of leaf area to plant dry weight tended to increase as PPFD treatment decreased. The highest PPFD treatment produced plants with the highest ratio of leaf dry weight to leaf area. Although the rate of leaf emergence was linear for all plants, the rate of leaf emergence was reduced in the two lowest PPFD treatments. We estimated that the efficiency of dry weight production for PPFD received increased at the lowest PPFD treatment. The minimum PPFD necessary for growth was estimated to be 5 mol m-2 day-1, and dry matter production per plant could increase to the maximum PPFD received in unshaded habitats of the southeastern United States.