Biomass allocation and foliage heteroblasty in hard pine species respond differentially to reduction in rooting volume
Biomass allocation and foliage heteroblasty in hard pine species respond differentially to reduction in rooting volume
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DOI：
10.1007/s10342-010-0476-y
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发表时间：
2011-09-01
影响因子：
2.8
通讯作者：
Villar-Salvador, Pedro
中科院分区：
文献类型：
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作者：
Climent, Jose;Regina Chambel, Maria;Villar-Salvador, Pedro
生根空间被认为是植物的一种资源，但关于生根体积（RV）对生物量分配可塑性的比较研究很少。我们比较了生长，生物量分配和个体发育异胚性的反应，在9个硬松物种的对比生态。将幼苗在0.2、0.5、1.0、2.8和7 L的容器中培养两个生长季节（425天）。RV的减少导致植物的绝对和相对生长速率和生物量分配到茎的减少，但它增加了生物量分配到根。RV受影响程度较小，并且分配到叶子的方向不太一致。生长较快（相对生长率较高）的物种随着RV的减少而生长急剧下降。个体发育的异胚性，评估为针叶生物量中的次生针叶的比例，表现出高度不同的可塑性模式响应RV。RV的减少引起的变化可以忽略不计，无论是在最个体发育延迟的地中海松或在最个体发育先进的松树，梅西奇樟子松和P.钩。相比之下，个体发育中间物种表现出陡峭的反应规范，以减少RV。而P.pinaster和P.brutia表现出明显的复壮，P.nigra加速了成年叶的发育。
Rooting space is considered as a resource in plants, but comparative studies on the biomass allocation plasticity in response to rooting volume (RV) are rare. We compared responses in growth, biomass allocation and ontogenetic heteroblasty in nine hard pine species of contrasted ecology. Seedlings were cultivated in containers of 0.2, 0.5, 1.0, 2.8 and 7 L for two growing seasons (425 days). Reduction in RV caused a reduction in plant absolute and relative growth rate and biomass allocated to stems but it increased biomass allocated to roots. RV affected to a lesser extent and in a less consistent direction allocation to leaves. Species that grew faster (higher relative growth rate) had a steeper decrease in growth with the reduction in RV. Ontogenetic heteroblasty, evaluated as the proportion of secondary needles in the needle biomass, showed highly different plasticity patterns in response to RV. Decrease in RV caused negligible or no change either in the most ontogenetically delayed Mediterranean pines or in the most ontogenetically advanced pines, the mesic Pinus sylvestris and P. uncinata. By contrast, ontogenetically intermediate species showed steep reaction norms in response to reduction in RV. While P. pinaster and P. brutia showed marked rejuvenation, P. nigra accelerated the development of adult foliage.