不同紫云英基因型对难溶性磷吸收利用的影响

Effects of different genotypes of Astragalus sinicus on uptake and utilization of sparingly soluble phosphorus

通过石英砂培养试验,研究了不同基因型对紫云英(Astragalus sinicus)吸收和利用难溶性磷酸盐(Al-P和Fe-P)的影响。结果表明,紫云英在不同磷源中的生长性状、生物量以及植株不同部位的吸磷量有很大差异。从株高、茎粗、分枝数性状方面来看,均表现为K-P>Al-P>Fe-P>CK,且两种难溶性磷处理之间差异达到显著或极显著水平。对大多数紫云英基因型来说Al-P的地上部、地下部及总干物质量都显著大于Fe-P,说明紫云英更容易活化和吸收Al-P。闽紫6号和闽紫1号在利用难溶性磷时都显著高于余江大叶和弋江籽。不同紫云英基因型在不同磷源中,地上部、地下部吸磷量及总吸磷量也均表现为K-P>Al-P>Fe-P>CK,即对不同磷源的吸收能力均以K-P最高,Al-P大于Fe-P。闽紫6号和闽紫1号对难溶性磷的吸收量均高于其它3个品种,表明闽紫6号和闽紫1号对难溶性磷具有较强的溶解吸收能力。从植株吸磷量与生物量关系可以看出,紫云英植株地上部、地下部干物质量及总干物质量、鲜质量增加时,植株吸收磷的养分质量分数也随着增加,呈显著正相关。CK和Al-P处理总干物质量与总吸磷量拟合回归关系显著,但对水溶性K-P和Fe-P处理相关回归关系效果不明显,说明紫云英对难溶性磷吸收利用时,对Al-P吸收富集优于Fe-P。

A Sand pot incubation experiment was carried out to study the effects of different genotypes on the uptake and utilization of insoluble soluble phosphate（Al-P and Fe-P） by Chinese milk vetch（Astragalus sinicus）.The results indicated that the growth characteristics,plant biomass and P uptake of different parts varied greatly with different P sources.Plant height,stem diameter,branch number all appeared as K-P Al-P Fe-P CK,and significant difference was observed between two kinds of insoluble phosphate.For most genotypes of the Chinese milk vetch,Al-P was significantly higher than Fe-P in aboveground,underground and total fresh and dry weights,implying that Al-P could be assimilated by Chinese milk vetch in a easier way.The uptake of insoluble phosphate by No.6 Minzi and No.1 Minzi were higher than Yu Jiang Daye and Yi Jiang zi.Aboveground,underground and total P uptake of all genotypes appeared as K-P Al-P Fe-P CK.No.6 Minzi and No.1 Minzi had greater capacity of uptaking and utilizing insoluble P,than the other three species.According to the relationship between plant P uptake and biomass,P uptake was positively correlated with the plant biomass.The regression between total dry weight and total P uptake was significant in CK and Al-P treatments,not significant in K-P and Fe-P treatments,indicating that the absorption of Al-P in was greater than Fe-P in the utilization of insoluble phosphate by Chinese milk vetch.