土壤盐分含量对落羽杉营养吸收的影响

The Effect of Soil Salt Contents on Uptake of Nutrients of Baldcypress

应用温室盆栽试验方法,采用完全随机试验设计,研究了土壤盐分含量对1年生落羽杉实生苗的营养吸收的影响 试验共有4种处理(对照、NaCl含量为土壤干重的0 15%、0 3%和0 45%),处理时间为130d 研究结果表明,(1)各种盐分处理在不同程度上提高了落羽杉根系、茎和叶片中全N、全Ca、全Na、全Fe浓度,全P、全K和全Mg浓度在根系中随着土壤盐分浓度的增加而下降,但在茎和叶中则逐渐升高;(2)根系中Ca/Na随土壤盐分浓度的增大而增大,而茎和叶中Ca/Na、以及根、茎和叶中K/Na、Mg/Na、Fe/Na均随着土壤盐分浓度的增大而减少;(3)根、茎和叶中全N和全P浓度的大小均是叶>根>茎,全Ca浓度大小的顺序是叶>茎>根,全Fe浓度大小的顺序是根>叶>茎,而根、茎和叶中全K。

One year old seedlings of baldcypress (Taxodium distichum L.) were grown in a pot under greenhouse conditions with varying soil salt (NaCl) contents (CK, 0.15%, 0.3% and 0.45% of drought weight of soil) to study the effects of soil salt content on uptake of nutrients of baldcypress. The time of treatment was 130 days, and the results were as follows: (1)The total N, Ca, Na and Fe concentrations of root, stem and leaf increased with increasing of soil salt content, and total P, K and Mg concentration of root decreased with increasing of soil salt content, and total P, K and Mg concentration of stem and leaf increased with increasing of soil salt content; (2) Ca/Na of root increased with increasing of soil salt content, and Ca/Na of stem and leaf, K/Na, Mg/Na and Fe/Na of root, stem and leaf decreased with increasing of soil salt content; (3) The order of total N and P concentration of root, stem and leaf was leaf>root>stem, and total Ca concentration was leaf>stem>root, and total Fe concentration was root>leaf>stem, and the order of total K, Na and Mg concentration of root, stem and leaf was different with varying soil salt contents.