氮磷供应水平对野蔷薇生长和养分吸收的影响

[目的]研究不同养分梯度下野蔷薇生长、养分吸收特征及根土互作效应,为优化施肥提供科学依据.[方法]采用大田实验,研究5个施氮和5个施磷水平(分别为0、50、100、200和300 mg/kg)对无刺野蔷薇(Rosa multiflora Thunb.ex Murr.)主干地径、养分吸收、叶片SPAD及土壤养分有效性的影...

Effects of Different Supply Levels of Nitrogen and Phosphorus on Growth and Nutrient Uptake in Rosa multiflora

【Objective】 Study the nutrient absorption characteristics and root-soil interaction effects of wild rose will provide a scientific basis for optimal fertilization. 【Methods】 A field experiment was carried out to study the effects of five nitrogen and five phosphorus levels (0, 50, 100, 200, and 300 mg/kg, respectively) on the main stem diameter, nutrient absorption, leaf SPAD and the soil nutrient availability. 【Results】 The results of the two-year experiment showed that with the increase in nitrogen application, main stem diameter increased firstly and then decreased. When the nitrogen application rate increased from 0 to 50 mg/kg, the stem diameter growth increased by 22.69%-35.05%; When the rate increased to 100 mg/kg, the stem diameter growth increased by 46.34%-51.14%; When the amount of nitrogen increased to 300 mg/kg, the value of stem diameter growth decreased significantly. The effects of phosphorus supply levels on stem diameter showed a similar trend to nitrogen in 2018. When the phosphorus application rate was 100 mg/kg, the ground diameter growth reached the maximum,and then began to decrease. However, different trends were discovered in 2019. When the amount of phosphorus applied increased from 0 to 50 mg/kg, the stem diameter increased by 38.02%, and then remained stable. When the nitrogen application rate was 200 mg/kg and the phosphorus application rate was 100 mg/kg, the leaf SPAD value increased by 4.79% -17.12% and 5.85% -17.82%, respectively, compared with other treatments. With the increase in nitrogen application, the nitrogen content of the plants (leaves and branches) showed a similar trend as stem growth. As the amount of phosphorus applied increased, the phosphorus content of leaves and branches showed a trend of increasing first and then stabilizing. Moreover, under different nitrogen levels, the growth of main stem diameter showed a significant positive correlation with plant nitrogen content and soil available nitrogen (P <0.05). In contrast, under different phosphorus supply levels, the growth of main stem diameter only showed a significant correlation with soil available phosphorus (P <0.01). 【Conclusion】 The growth of Rosa multiflora shows a high degree of plasticity to the supply intensity of nitrogen and phosphorus. The appropriate levels of nitrogen and phosphorus supply are effective to maintain the appropriate nutrient availability in the soil, and promote nutrient absorption and the expansion of the trunk diameter.