College of agriculture and forestry science, Linyi University, Lin'yi, China.
Shandong Provincial Forestry Protection and Development Service Center, Ji'nan, Shandong province, China.
Int J Phytoremediation. 2023;25(9):1189-1198. doi: 10.1080/15226514.2022.2144795. Epub 2022 Nov 11.
Phenolic acids can reduce nitrogen utilization rate of poplar, which seriously restrict the productivity of poplar plantation. In this study, three phenolic acid concentrations (T0, T1, and T2) and three ratios of nitrogen forms (NH-N to NO-were 1:3, 1:7, and 1:14) were chosen for orthogonal experiment on poplar "Neva") seedlings to study the effects of the nitrogen form ratios on photosynthetic productivity of poplar under environment of phenolic acids. Results showed that photosynthetic physiology parameters were influenced by both phenolic acid concentration and nitrogen form ratio. The order of net photosynthetic rate () values obtained from 9 treatments were T1-1:3, T0-1:3, T2-1:3, T0-1:7, T1-1:7, T0-1:14, T2-1:7, T1-1:14, and T2-1:14 (from high to low). Under environment of phenolic acids, when poplar were treated with NH-N to NO-N ratio of 1:14, the major limitation factor of photosynthesis was non stomatal factor. When poplar were treated with NH-N to NO-N ratio of 1:3, the major limitation factor of photosynthesis changed to stomatal factor. The leaf nitrogen content and total biomass were obviously positively related with ( < 0.05). Phenolic acid inhibited photosynthetic productivity of poplar in a major way and this effect decreased with increase of the content of NH-N.
酚酸会降低杨树对氮的利用率，从而严重限制了杨树种植的生产力。在这项研究中，选择了 3 种酚酸浓度（T0、T1 和 T2）和 3 种氮形态比例（NH4+-N 与 NO3--N 的比例为 1:3、1:7 和 1:14），对 “Neva”杨树幼苗进行正交实验，以研究酚酸环境下氮形态比例对杨树光合作用生产力的影响。结果表明，酚酸浓度和氮形态比例都会影响光合作用生理参数。9 种处理中净光合速率（）的数值大小顺序为 T1-1:3>T0-1:3>T2-1:3>T0-1:7>T1-1:7>T0-1:14>T2-1:7>T1-1:14>T2-1:14（由高到低）。在酚酸环境下，当杨树用 NH4+-N 与 NO3--N 的比例为 1:14 处理时，光合作用的主要限制因素是非气孔因素。当杨树用 NH4+-N 与 NO3--N 的比例为 1:3 处理时，光合作用的主要限制因素变为气孔因素。叶片氮含量和总生物量与（ < 0.05）呈明显正相关。酚酸主要以抑制杨树光合作用生产力的方式起作用，且这种作用随 NH4+-N 含量的增加而降低。
