黄芩干物质累积和氮磷钾吸收、分配规律研究

为了探讨黄芩干物质累积和氮、磷、钾吸收与分配的特点及两者间的相互关系,通过田间试验和采样分析,研究了黄芩不同生育期植株的干物质和氮、磷、钾累积量.结果表明,黄芩干物质的累积量随生育进程不断地增加,出苗后52～85 d干物质累积量占总累积量的61.62％.在整个生育期,黄芩对K2O的吸收累积量最大,N次之,P2O5最小,N、P2O5、K2O吸收比例约为2.8∶1.0∶2.9,并且黄芩地上部氮磷钾的累积量大于根部,不同生育期,根部N、P2O5、K2O的累积比例呈现增加—降低—增加的趋势.黄芩对氮磷钾的积累量与干物质积累量呈极显著正相关关系.在供试的土壤和施肥条件下,每生产100 kg的黄芩根需要从土壤和肥料中吸收6.34 kg的N,2.60 kg的P2O5,7.02 kg的K2O.

Absorption and Distribution of Nitrogen, Phosphorus and Potassium in Scutellaria baicalensis Georgi and Their Relationships to Dry Matter Accumulation

To study the relationship between the accumulation of dry matter and the absorption characteristics of N,P and K in Scutellaria baicalensis Georgi.Field experiments and sampling analysis were used to study the accumulation capacity of dry matter and N,P and K at different growing stages of S.baicalensis Georgi.The accumulation of dry matter in S.baicalensis Georgi increased with growth,and reached 61.62% of the total accumulation within 52-85 d after germinating.During the whole growth period,the accumulation capacity of potassium was the highest,followed by nitrogen,with phosphorus the lowest.The accumulation ratio of N,P and K was 2.8 ∶1.0 ∶2.9,and they were all found in higher concentrations in the roots than aboveground parts.The accumulation of N,P and K in the root showed an increasing-decreasing-increasing trend with different growing stages.These results showed that dry matter accumulation and nitrogen,phosphorus and potassium accumulation were correlated positively.To produce 100 kg root,S.baicalensis Georgi needed to absorb 6.34 kg of N,2.60 kg of P2O5,7.02 kg of K2O from the soil and fertilizer.