三峡库区脐橙生长元素农业地球化学研究

利用田间试验研究了三峡库区福罗斯特脐橙(Citrus.sinensis)体内营养元素(N、P、K、Ca、Mg、Zn、Mn、Cu、Fe)的分布特征及其农业地球化学行为。结果表明:大量元素中,树干(枝)Ca含量最高,花器官中K含量最高,根系与叶片中大量元素含量分布基本相同,大量元素在脐橙中的含量分配与土壤中的分配基本一致,均为脐橙强烈摄取元素;微量元素Zn、Mn、Cu为中等摄取元素,Fe为极微弱摄取元素,土壤背景为营养元素的主要控制因素。叶、花、根为大量元素与微量元素较为富集的器官,而树干、果实对各营养元素的富集程度较弱。该地区土壤具有缺N、少P、富K的特点,因此需合理调整有机、无机肥的比例,提高土壤N、P的供应量。

Agro-geochemistry study on nutrient elements in frost navel orange in the Three Gorges Region

Under the field condition, the distribution and abundance of the nutrient (N, P, K, Ca, Mg, Zn, Mn,Cu, Fe) in the citrus and the agro-chemistry of the nutrient elements were analyzed in the present study. The results showed that Ca and K had the maximal contents in the trunk and flower respectively. The distribution of macroelement in the root and leaf was similar. The macroelement in the plant parts which was uptaked strongly was consistent with that in the surface soils. The microelement of Zn, Mn and Cu was uptaked moderately, while the uptake of Fe was very weak. The nutrients were controlled strictly by the background contents of the soil. The amounts of elements in the leaf, flower and root were significantly higher than in the other parts of navel organs, while the trunk and fruit was relatively lower. In the test area, the contents of N and P were deficient but K was rich, so the ratio of N and P should be adjusted in order to improve the supply of N and P by the soil.