土壤氮磷化学计量特征对小麦光合气体交换参数和叶绿素荧光参数的影响
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江苏省农业科技自主创新资金[CX(15)1004];


Effects of Soil Nitrogen and Phosphorus Stoichiometric Characteristics on Photosynthetic Gas Exchange and Chlorophyll Fluorescence of Wheat
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    摘要:

    选取‘镇麦168’为实验对象,采用盆栽实验,设置16个不同土壤氮磷梯度,测定不同土壤氮磷化学计量比处理下小麦叶片叶绿素含量、光合气体交换参数和叶绿素荧光参数的响应特征,以揭示不同土壤氮磷化学计量关系对小麦叶片光合特性影响的生理生态机制。结果表明:(1)不同生育期内小麦叶片叶绿素含量均随土壤速效N或速效P含量的增加而增加。(2)随着土壤化学计量比N∶P下降,小麦叶片净光合速率(Pn)在土壤中低氮水平(≤258.4 mg·kg-1)下持续增加,在高氮水平(308.4 mg·kg-1)下则呈现先增后降的趋势。(3)在土壤速效N相同水平处理下,土壤化学计量比N∶P的降低显著提高了小麦叶片叶绿素荧光参数最小荧光(F0,7.27%~20.00%)、最大荧光(Fm,5.28%~16.15%)、光化学猝灭系数(qP,6.64%~20.92%)及实际光化学效率(ΦPSⅡ,6.95%~18.82%),显著降低了非光化学猝灭系数(NPQ,7.42%~25.63%,P<0.05)。研究认为,在中、高氮磷养分水平下,土壤化学计量比N∶P为2.88时,‘镇麦168’叶片净光合速率和实际光化学效率均达到最高水平,表现出较强的光能利用能力。

    Abstract:

    To clarify the effect of stoichiometric of soil available nitrogen (N) and phosphorus (P) on the photosynthetic characteristic of wheat, we conducted a pot experiment with 16 different NP levels to examine the characteristic of photosynthetic gas exchange and fluorescence parameters of ‘Zhenmai168’ in response to different NP treatments. Our results showed that: (1) The chlorophyll content of the wheat leaves increased with an increase of soil available N and P. (2) Photosynthesis (Pn) exhibited a continuously increasing trend with decline of soil N/P ratio under the condition that soil available N was less than 258.4 mg·kg-1. In contrast, photosynthesis (Pn) firstly showed an increasing trend and then decreased under higher N level with 308.4 mg·kg-1. (3) F0, Fm, qP and ΦPSⅡ values of wheat increased 7.27%-20.00%, 5.28%-16.15%, 6.64%-20.92% and 6.95%-18.82%, respectively, and NPQ value decreased 7.42%-25.63% under decline of soil N/P treatments with the same level of available N. Our results suggested that both of Pn and ΦPSⅡ of Zhenmai168 reached the highest level and showed strong light energy use efficiency under higher NP level condition with 2.88 value of N∶P ratio.

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付为国,王凡坤,赵 云,等.土壤氮磷化学计量特征对小麦光合气体交换参数和叶绿素荧光参数的影响[J].西北植物学报,2016,36(7):1435-1442

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  • 在线发布日期: 2016-08-16
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