镧对水稻磷吸收及其形态的影响  

Influence of Lanthanum on Phosphorus Uptake and Its Chemical Fractions in Rice (Oryza sativa)

作　　者：谢祖彬[1] 朱建国[1] 褚海燕[1] 张雅丽[1] 曹志洪[1] 

机构地区：[1]中国科学院南京土壤研究所土壤圈物质循环重点实验室,江苏南京210008

出　　处：《中国稀土学报》2004年第1期153-157,共5页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金(29890282);中国科学院封丘农业生态试验站资助项目

摘　　要：用分根营养液培养法研究了镧对水稻生长,根、茎、籽粒磷含量,磷吸收及体内磷形态的影响。结果表明低浓度镧(0.05～1.5mg·L-1)提高水稻产量;高浓度镧(9mg·L-1～30mg·L-1)降低水稻产量。当镧浓度为0.05～0.75mg·L-1时,La对水稻茎杆和根干重没有显著促进作用。在La浓度为6～30mg·L-1时,水稻根重显著降低。镧显著增加根中磷的含量,降低茎和籽粒中磷的含量,显著增加根对磷的吸收。低浓度镧(0.05～3mg·L-1)促进籽粒磷吸收,而高浓度镧(6～30mg·L-1)减少籽粒磷吸收。镧显著增加茎和根中络合态磷(ED TA P)和无机态磷(inorganic P)含量,且根中络合态磷和无机态磷的增加占根中总磷增加的80%以上。当镧浓度为0.05～0.75mg·L-1,La增加根中核磷(nucleic P)含量,而当镧浓度为30mg·L-1,La降低根中核磷和酯磷(ester P)含量;La增加根和茎中残渣态磷(residue P)含量。文中还讨论了磷的形态与作物磷吸收的关系。The effects of lanthanum on rice growth, phosphorus uptake and phosphorus chemical fractions in rice were studied with split-root nutrient solution culture method. Results show that low La concentrations (0.05～1.5 mg·L^(-1)) significantly increase rice yield and high La concentrations (9～(30 mg·L^(-1))) markedly decrease rice yield. When La concentrations are 0.05～0.75 mg·L^(-1), La increases stem and root dry weight, but the difference is not statistically significant. At the La concentrations of 6～(30 mg·L^(-1),) La decreases root dry weight significantly. Along with the increase of lanthanum concentration, La significantly increases the root phosphorus concentration. When La concentrations are (0.05～)9 mg·L^(-1), La decreases stem and grain phosphorus concentration, but the difference is not statistically remarkable. Low concentrations of La (0.05～3 (mg·L^(-1))) enhance grain phosphorus uptake, but high La concentrations (6～30 (mg·L^(-1))) decrease grain phosphorus uptake. La significantly increases EDTA-P and inorganic-P concentration in the stem and root. More than eighty percent increase of the root phosphors concentration was from the increase of EDTA-P and inorganic-P. Low concentrations of La (0.05～0.75 mg·L^(-1)) increase root nucleic-P content, but high La concentration (30 (mg·L^(-1))) decreases root nucleic-P and ester-P content. La increases the residue-P concentration in the root and stem. Also the relationship between the phosphorus chemical fractions and phosphorus uptake was discussed.

关 键 词：镧 磷吸收 磷形态 稀土 水稻 

分 类 号：S511[农业科学—作物学] O614.33[理学—无机化学]