Nutrient Uptake Characteristics and Their Relationships with Accumulation of Medicinal Composition of Paeonia lactiflora in the Arid Region of Hexi
The authors studied the rules of nutrient absorption and their relationships with the accumula-tion of medicinal composition,in order to clarify the types of nutrient elements that affect the accumula-tion of medicinal components and provide a theoretical basis for the scientific formulation of fertilization plans and standardized planting of Paeonia lactiflora in the Hexi region.The 4-year-old P.lactiflora were taken as the research material in Gufeng Town,Gulang County,Gansu Province.The dry matter ac-cumulation characteristics,nine nutrient elements and three types of medicinal compositions of P.lacti-flora at different growth stages were studied,and the correlation between the content of effective compo-nents in P.lactiflora and nutrient elements was explored with field experiments.The results showed that the accumulation of dry matter in the roots of P.lactiflora showed a trend of first decreasing and then increasing.The dry matter of the entire plant of P.lactiflora gradually increased with the growth period,and the period of 90 days to 130 days after emergence was the fastest period for dry matter accu-mulation,accounting for 79.29％of the total accumulation.It was a critical period for the growth of P.lactiflora.The nitrogen and potassium contents showed decreasing trend,while the phosphorus content showed significant increasing trend in the aboveground parts of P.lactiflora at different growth stages.The nitrogen and phosphorus contents showed decreasing trend in the roots,while the potassium content changed little.The total accumulation of aboveground and root nitrogen reached their highest levels at 130 days and 150 days after emergence,respectively.The accumulation of aboveground phosphorus reached its maximum at 150 days,while the accumulation of root phosphorus reached its peak at 30 days and 150 days after emergence.The accumulation of aboveground potassium reached its maximum at 70 days and the accumulation of root potassium reached its peak at 150 days after emergence.The nitrogen and potassi-um contents in the aboveground parts were higher than those in the roots at different growth stages,while the phosphorus content was lower than the roots before 90 days and higher than the roots after 110 days after emergence.The accumulation of paeoniflorin and albiflorin in roots first increased,then decreased,and finally stabilized.The accumulation of polysaccharides showed a trend of high-low-high.The content of paeoniflorin was highly significantly positively correlated with nitrogen,calcium,and copper contents,and significantly positively correlated with potassium content.The content of albiflorin was highly signifi-cantly positively correlated with nitrogen,potassium,calcium,and copper contents,while there was no correlation between polysaccharide and various nutrients.The maximum efficiency period of nitrogen,phosphorus,and potassium nutrition was 110-150 days after emergence.Nitrogen and potassium fertiliz-ers were beneficial for the accumulation of root biomass.Adding Ca and Cu elements to fertilization could effectively promote the accumulation of effective components in P.lactiflora.P.lactiflora should be harvested in the cold and cool mountainous areas of Hexi in mid to late September(after 16th September).
Hexi arid areaPaeonia lactifloracharacteristics of dry matter accumulationnutrient ab-sorption patternmedium and trace elementsmedicinal composition
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