摘要
利用水培试验研究了不同铜水平对水稻幼苗生长、铜积累和养分吸收的影响。结果表明,1μmol·L^(-1)铜处理水稻时,幼苗的生长并不受影响,随着铜浓度的增加,水稻幼苗的生长受到不同程度的抑制;水稻幼苗地上部铜的含量和累积量随着溶液中铜供应水平的增加而增加,但水稻根系中铜的含量及累积量并不是随着外源铜浓度的增加而增加,其最大值均出现在20μmol·L^(-1)铜处理时;1μmol·L^(-1)铜处理的水稻地上部N、P和K的含量和累积量不受抑制,而在20、50和80μmol·L^(-1)铜处理中,地上部养分的含量和累积量显著减少;低铜浓度下(1和20μmol·L^(-1)),水稻根系吸收N、P和K不受影响,甚至20μmol·L^(-1)铜浓度更有利于水稻根系养分的吸收,高铜浓度下(50和80μmol·L^(-1)),水稻根系吸收养分受到不同程度影响,且在80μmol·L^(-1)铜浓度时,N、P、K的吸收均明显受到抑制。
Solution culture experiments were carried out to study the effects of different copper levels on growth, copper accumulation and nutrient uptake of rice seedlings. The results showed that growth of rice seedlings was not affected by 1 μmol·L^-1 Cu. With the increasing of copper concentrations, the inhibition of rice growth was observed to some extent. Under treatments of 50 and 80 μmol· L^-1 Cu, plant height, dry weight of shoots and root length of rice seedlings were significantly reduced. Copper content and accumulation in rice shoots instead of roots increased with the augment of copper concentration in nutrient solution. Copper content and accumulation in roots at 20 μmol·L^-1 Cu were the largest among the five levels of Cu treatment. The content and accumulation of N, P and K in shoots was not restrained when rice grown in the solution with 1 μmol· L^-1 Cu, on the contrary, which was significantly inhibited when rice was grown in solutions with 20, 50 and 80 μmol· L^-1 Cu. Low copper concentrations including 1 and 20 μmol·L^-1 Cu did not inhibit uptake of N, P and K by rice roots, especially, 20 μmol· L^-1 Cu accelerated the nutrient uptake, while, high copper levels including 50 and 80 μmol· L^-1 Cu refrained the nutrient uptake by roots. In the treatment with 80 μmol·L^-1 Cu, the uptake of N, P and K by rice roots was significantly retarded.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2007年第4期1312-1315,共4页
Journal of Agro-Environment Science
基金
国家重点基础研究发展计划项目(973-G1999011800)
关键词
水稻
铜
养分
吸收
rice
copper
nutrient
uptake
