Influence of Lanthanum on Phosphorus Uptake and Its Chemical Fractions in Rice Crop (Oryza Sativa)
来源期刊：JOURNAL OF RARE EARTHS2003年第2期
论文作者：朱建国 曾青 曹志洪 张雅丽 谢祖彬 褚海燕
Key words：botany; lanthanum; phosphorus uptake; chemical fractions; rare earths;
Abstract: The effects of lanthanum on rice growth, phosphorus uptake and phosphorus chemical fractions in rice were studied with split-root solution culture. Results show that low concentration of La (0.05～1.5 mg*L-1) significantly increases rice yield while high La concentration (9～30 mg*L-1) markedly decreases rice yield. When La concentration is 0.05～0.75 mg*L-1, La increases stem and root dry weight, but the difference is not statistically significant. La significantly increases EDTA-P and inorganic-P content in the stem and root. More than 80% of the increase of phosphors content in roots attributing to increase of EDTA-P and inorganic-P. Low La concentration (0.05～0.75 mg*L-1) increases nucleic-P content in root, but high La concentration (30 mg*L-1) decreases nucleic-P and ester-P content in root. The residue-P content increases in the root and stem. Also the relationship between the chemical fractions of phosphorus and its uptake by rice was discussed.
朱建国1，曾青1，曹志洪1，张雅丽1，谢祖彬1，褚海燕1
(1.Laboratory of Material Cycling in Pedosphere, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China)
Abstract:The effects of lanthanum on rice growth, phosphorus uptake and phosphorus chemical fractions in rice were studied with split-root solution culture. Results show that low concentration of La (0.05～1.5 mg*L-1) significantly increases rice yield while high La concentration (9～30 mg*L-1) markedly decreases rice yield. When La concentration is 0.05～0.75 mg*L-1, La increases stem and root dry weight, but the difference is not statistically significant. La significantly increases EDTA-P and inorganic-P content in the stem and root. More than 80% of the increase of phosphors content in roots attributing to increase of EDTA-P and inorganic-P. Low La concentration (0.05～0.75 mg*L-1) increases nucleic-P content in root, but high La concentration (30 mg*L-1) decreases nucleic-P and ester-P content in root. The residue-P content increases in the root and stem. Also the relationship between the chemical fractions of phosphorus and its uptake by rice was discussed.
Key words:botany; lanthanum; phosphorus uptake; chemical fractions; rare earths;
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