ABSTRACT To improve the use efficiency of fertilizer in agricultural production, effects of stoichiometric traits of soil available nitrogen (N) and phosphorus (P) on photosynthetic gas exchange parameters and fluorescence parameters of wheat were revealed in a full factorial pot experiment with our N and P fertilizer rates each. Results showed that at the same level of soil available N, the net photosynthetic rate (Pn), stomatal conductance (Cond), photochemical quenching (qP), the quantum yield of PSII photochemistry (ΦPSII), and apparent electron transport rate (ETR) of wheat generally increased with a decline of soil N/P ecological stoichiometric ratio (by increasing soil available P), whereas the intercellular CO2 concentration (Ci) and nonphotochemical quenching (NPQ) of wheat decreased with a decline of soil N/P. At the same level of soil available P, Pn, Cond, qP, ΦPSII, and ETR of wheat initially increased and then decreased with an increase of soil N/P ecological stoichiometric ratio (by increasing soil available N), whereas the dynamics of Ci and NPQ of wheat were exactly opposite to those of the above parameters. A limiting effect of soil available P on the photosynthesis of wheat occurred during the entire experiment. It was deduced that the cultivated soil, with the available N of 258.4 mg·kg−1, available P of 89.6 mg·kg−1, and stoichiometric N/P of 2.88, was suitable for weak gluten wheat cultivar Yangmai15. Therefore, another approach to improves nutrient use efficiency was provided on the basis of ecological stoichiometry theory. Abbreviations N: nitrogen; P: phosphorus; Pn: net photosynthetic rate; Cond: stomatal conductance; Ci: intercellular CO2; NPQ: nonphotochemical quenching; qP: photochemical quenching; ΦPSII: the quantum yield of PSII photochemistry; ETR: apparent electron transport rate

中文翻译：

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土壤氮磷化学计量性状对小麦光合特性的影响

摘要 为了提高肥料在农业生产中的利用率，通过全因子盆栽试验揭示了土壤有效氮（N）和磷（P）化学计量性状对小麦光合气体交换参数和荧光参数的影响。磷肥率各一个。结果表明，在相同土壤速效氮水平下，净光合速率（Pn）、气孔导度（Cond）、光化学猝灭（qP）、PSII光化学量子产率（ΦPSII）和表观电子传递速率（ETR）随着土壤氮磷生态化学计量比的降低（通过增加土壤有效磷），小麦的 t 含量普遍增加，而小麦的细胞间 CO2 浓度（Ci）和非光化学猝灭（NPQ）随着土壤 N/P 的下降而降低。在同一水平土壤速效磷、Pn、Cond、qP、ΦPSII和ETR随着土壤N/P生态化学计量比的增加（通过增加土壤有效N），小麦先增加后减少，而Ci的动态变化小麦的NPQ和NPQ与上述参数正好相反。在整个实验过程中，土壤有效磷对小麦光合作用的限制性影响发生。推断该栽培土壤速效氮为258.4 mg·kg-1，速效磷为89.6 mg·kg-1，化学计量比N/P为2.88，适合于弱筋小麦品种杨麦15。因此，在生态化学计量理论的基础上，提供了另一种提高养分利用效率的方法。缩写 N：氮；P：磷；Pn：净光合速率；Cond：气孔导度；词：细胞间二氧化碳；NPQ：非光化学淬灭；qP：光化学淬灭；ΦPSII：PSII光化学的量子产率；ETR：表观电子传输率