论文部分内容阅读
用不同比例A1和C层棕色针叶林土混合(A1:C=1:1)制造土壤养分缺乏条件,系统研究了养分缺乏条件下,不同浓度外源有机酸对落叶松幼苗吸收P的影响及机理。结果如下:养分缺乏条件下,0.2-10.0mmol/L草酸与柠檬酸处理后苗木根系和叶片P的含量均有所增加。草酸处理后寒温带落叶松幼苗根系和叶片磷含量变化一致。兴安落叶松幼苗根系和叶片P含量大致随草酸浓度的增加而增加(r分别为0.67和0.78)。草酸浓度10.0mmol/L时落叶松幼苗根系和叶片P含量达峰值。柠檬酸处理后寒温带落叶松幼苗根系和叶片磷含量变化一致,大致随柠檬酸浓度的增加而增加(r分别为0.69和0.78),且在5.0mmol/L时落叶松幼苗叶片P含量达峰值。柠檬酸处理后兴安落叶松幼苗根系P含量高于草酸处理后幼苗根系P含量,而柠檬酸和草酸处理后兴安落叶松幼苗叶片P含量差异不大。柠檬酸与草酸浓度0.2mmol/L均高于1mmol/L条件下兴安落叶松幼苗根系与叶片P含量。
Soil nutrient deficiencies were established by mixing different proportions of A1 and C brown coniferous forest soil and soil (A1: C = 1: 1), and the effect of organic acids with different concentrations on P uptake by larch seedlings under nutrient deficiencies And mechanism. The results are as follows: Nutrient deficient conditions, 0.2-10.0mmol / L oxalic acid and citric acid seedling roots and leaves P content increased. The content of phosphorus in roots and leaves of cold temperate larch seedlings after oxalic acid treatment was the same. The content of P in root and leaf of Larix gmelinii seedlings increased with the increase of oxalic acid concentration (r = 0.67 and 0.78, respectively). When the concentration of oxalic acid was 10.0 mmol / L, the content of P in the roots and leaves of larch seedlings reached the peak value. Phosphorus content in roots and leaves of cold temperate larch seedlings changed with the increase of citric acid concentration (r = 0.69 and 0.78, respectively) after treatment with citric acid, and reached the peak value at 5.0 mmol / L . The content of P in root of Larix gmelinii seedlings after citric acid treatment was higher than that of oxalic acid seedlings, while the content of P in leaves of P. larch seedlings after treated with citric acid and oxalic acid was not different. The concentrations of citric acid and oxalic acid of 0.2 mmol / L were higher than those of 1 mmol / L seedling roots and leaves of P. larch seedlings.