磷锌配施对石灰性土壤磷锌有效性及小麦对其吸收分配的影响

针对磷锌在土壤-植物系统中复杂的交互作用,本文采用盆栽试验,研究了磷锌配施对石灰性土壤中磷锌有效性及小麦对其吸收分配的影响。结果表明,施锌明显增加了土壤中DTPA提取态锌含量,土壤中DTPA提取态锌含量随着施磷水平的提高逐渐增加;施磷明显增加了土壤中速效磷含量,在相同施磷水平下,土壤中速效磷含量随施锌量的增加而增加;施锌提高了小麦茎叶和籽粒锌含量,且在各施锌背景下随施磷量的增加明显地降低了小麦茎叶中锌含量,但提高了籽粒中锌含量。施磷提高了小麦茎叶和籽粒磷含量。在低磷水平(不施磷和施21.82 mg kg-1)时,施锌对茎叶中磷含量的提高作用明显,且随施锌浓度的提高而提高,但籽粒中磷含量逐渐降低;而在高磷水平(174.56 mg kg-1)下,施锌则降低了小麦植株茎叶中磷含量,而籽粒中磷含量却随施锌水平的提高而提高。因此,石灰性土壤中施磷肥提高了土壤中锌的有效性,而锌也提高了磷的有效性,同时发现施磷降低了小麦茎叶中锌含量,促进了锌元素从植株向籽粒的运输,增加了小麦籽粒中锌含量,但是在低磷条件下,施锌提高了茎叶磷含量,却降低了籽粒磷含量,而在高磷条件下,施锌降低了茎叶磷含量,提高了籽粒含量。

Effect of Combined Application of P and Zn Fertilizers on P and Zn Availability and their Absorption and Distribution by Wheat in Calcareous Soil

Aiming at the complicated relation between on P and Zn,the effects of the combined application of P and Zn on the availability of Zn and P in calcareous soil,the P,Zn absorption and distribution by wheat were studied by pot experiment.The results showed that application of Zn could significantly increase the soil DTPA-extractable Zn content,which also increasing with applied P amount’s increase.Application of P could significantly increase the soil available P content,and under the same P applied treatments,the soil available P content was increased with Zn amount’s increase.Application of Zn could increase the Zn content in stem,leaf and seed,and the Zn contents in stem and leaf were significantly decreased with the application of P amount’s increase under different Zn treatments,but increased the Zn content in seed.Application of P could increase the P contents in stem,leaf and seed.The application of Zn could significantly increase P content in stem and leaf,which increased with Zn amount’s increase but decreased in seed under lower applied P treatment(no application of P and its amount was 21.82 mg kg-1).And under the higher P application treatment(P applied amount was 174.56 mg kg-1),application of Zn could significantly decrease P content in stem and leaf,but P content was increased with Zn application amount’s increase.So,application of P fertilizer into calcareous soil increased the Zn availability in soil,and decreased the Zn content in wheat leaves and stems and transport Zn to seed from leaves and stems,increased the Zn content in seed.But under the lower applied P amount treatment,application of Zn increased P content in leaves and stems,decreased P content in seed,but under the higher applied P treatment,application of Zn decreased P content in leaves and stems,increased P content in seed.