石灰性土壤中磷锌对小麦生长及锌吸收分配的影响

Effect of P and Zn on wheat growth, Zn absorption and distribution in calcareous soil

针对磷锌在土壤-植物系统中复杂的交互作用,文章采用盆栽试验,研究了石灰性土壤中施磷肥对小麦生长及吸收锌的影响,结果表明,施锌明显增加了土壤中DTPA提取态锌的质量分数,且土壤中wDTPA提取态锌随着施磷质量分数的提高逐渐增加;不同施磷质量分数背景下,随施锌质量分数的提高小麦茎+叶+籽粒壳的干重有所降低,却增加了小麦籽粒的干重;在各质量分数锌背景下施不同质量分数水平磷,明显地降低了小麦茎叶中锌的质量分数,但提高了籽粒中锌的质量分数,并增加了锌累积量;小麦地上部锌质量分数和锌累积量均随施锌水平的增加而增加。因此,石灰性土壤中施磷肥提高了土壤中锌的有效性,促进了小麦生长,降低了小麦茎叶中锌的质量分数,促进了锌元素从植株向籽粒的运输,增加了小麦籽粒中锌的质量分数,促进了小麦地上部分对锌元素的总吸收量。

Be aimed at the complicated relation between on P and Zn, the effects of P and Zn applied on the availability of Zn in calcareous soil, the growth of wheat, the concentration of Zn in wheat plants and seed was studied by pot experiment. The results showed that added Zn could significantly increased the soil DTPA-extractable Zn concentration, and increased with added P content increased. The wheat stem＋leaf＋seed shell dry weight was decreased with added Zn content increased under different P treatments, but increased wheat seed dry weight. The Zn concentration in stem and leaf was significantly decreased with added p content increased under different Zn treatments, but increased the Zn concentration in seed, and also increased the Zn accumulation content. Zn concentration and accumulation in wheat plant was increased with added Zn content increased. So, added P fertilizer into calcareous soil increased the DTPA-extractable Zn concentration in soil, promoted wheat growth, decreased the Zn concentration in wheat leaves and stems, but increased the Zn concentration in seed. In conclusion, P addition accelerated Zn transport to over ground wheat plants.