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Stock-type patterns of phosphorus uptake, retranslocation, net photosynthesis and morphological development in interior spruce seedlings.

机译:云杉内种苗对磷的吸收,转运,净光合作用和形态发育的种群类型。

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摘要

One-year-old interior spruce (Picea glauca X Picea engelmannii) container grown spring stock (spring/summer grown, autumn lifted and frozen stored before spring planting) and summer stock (winter/spring grown, summer lifted and planted) from a commercial nursery in British Columbia (Canada) were grown under 2 phosphorus (P) fertility regimes (+P or -P), followed by a simulated winter, and a second growing period under an adequate fertility regime in a controlled environment room. The 2 stock typesdiffered in their response to low P availability. For spring stock, morphological development, phosphorus use efficiency (PUE) and P specific absorption rate (SAR) were similar between -P and +P seedlings. For summer stock, -P seedlings had lower morphological development, but greater PUE and SAR than +P seedlings. For both stock types, P content increased in +P seedlings but remained low in -P seedlings, and P concentration decreased in nursery formed needles of -P seedlings. The difference in stock type response to low phosphorus availability (-P) was attributed to internal supply of P and its retranslocation. Assimilation (A) of CO2 in nursery needles was similar between -P and +P seedlings for both stock types. For spring stock, +P seedlings had greater A in new needles (i.e. needles formed during the trial) than -P seedlings. Based on these results, it is recommended that spring stock be selected over summer-stock for sites low in P availability.
机译:一年生的室内云杉(Picea glauca X Picea engelmannii)容器的春季库存(春季/夏季生长,秋季抬高并冷冻,在春季播种之前储存)和夏季库存(冬季/春季生长,夏季抬高并种植)不列颠哥伦比亚省(加拿大)的苗圃在2种磷(P)肥力制度下(+ P或-P)生长,随后是模拟的冬季,并在可控的环境室内在适当的肥力制度下进行第二个生育期。两种股票对低磷供应的反应有所不同。对于春季种群,-P和+ P幼苗的形态发育,磷的利用效率(PUE)和磷的比吸收率(SAR)相似。对于夏季种群,-P幼苗的形态发育较低,但PUE和SAR却比+ P幼苗大。对于这两种种群,+ P幼苗中的P含量均增加,但-P幼苗中的P含量仍然较低,而育苗地-P幼苗的针状体中的P浓度则下降。对低磷有效性(-P)的种群类型响应差异归因于磷的内部供应及其重新分配。两种种群类型的-P和+ P幼苗之间,育苗针中的CO2同化(A)相似。对于春季种群,+ P幼苗的新针(即试验期间形成的针)的A大于-P幼苗。根据这些结果,对于磷素利用率较低的地区,建议选择春季库存而不是夏季库存。

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