青杨雌雄幼苗对主要矿质元素的吸收与分配差异

Differences in Absorption and Distribution of Main Mineral Elements Between Male and Female Populus cathayana Seedlings

研究了一年生青杨雌雄幼苗及其不同部位对主要矿质元素(N、P、K、Ca、Mg)的吸收与分配特性及其性别间差异。结果显示:青杨雌株总P、总Ca的含量均显著高于雄株,总K含量则显著低于雄株。青杨雌雄幼苗叶片N含量均显著高于根、茎N含量,P、K、Mg含量分别表现出根>茎>叶、叶>根>茎、根>叶>茎的趋势。青杨雄株Ca含量呈现出根>茎>叶的趋势,但雌株却表现出根>叶>茎的趋势。同时,青杨雌株根P、叶Ca的含量均显著高于雄株,根Mg含量则显著低于雄株。此外,矿质元素含量比例在雌、雄幼苗根、茎、叶中均分别表现为Ca>K>N>Mg>P,Ca>N>K>P>Mg,N>K>Ca>Mg>P。结果表明,尽管矿质元素的比例模式在青杨雌雄幼苗的根、茎和叶中均相似,但其含量和分配在雌雄幼苗间具有显著的性别差异。

In the present experiment, the sex-related absorption and distribution patterns of the main mineral elements （N, P, K, Ca, Mg） were investigated between male and female Populus cathayana seedlings. The resuits showed that the female individuals exhibited significantly higher total content of P and Ca, but lower total content of K than male individuals. For two sexes, the content of N in leaf was significantly higher than that in root and stem, and the distribution pattern of P, K and Mg content showed that root 〉 stem 〉 leaf, leaf 〉 root 〉 stem, and root 〉 leaf 〉 stem, respectively. Meanwhile, the distribution pattern of Ca content showed the tendency of root 〉 stem 〉 leaves in males but the tendency of root 〉 leaf 〉 stem in females. Furthermore, females exhibited significantly higher Ca content in leaf and P content in root, but lower Mg content in root than males. In addition, the ratio patterns of these mineral elements contents were characterized as Ca 〉 N 〉 K 〉 Mg 〉 P in females, but N 〉 Ca 〉 K 〉 Mg 〉 P in males. However, in root, stem and leaf of all individuals, it was characterized as Ca 〉 K 〉 N 〉 Mg 〉 P, Ca 〉 N 〉 K 〉 P 〉 Mg, N 〉 K 〉 Ca 〉 Mg 〉 P, respectively. Our results suggested that there were sexual differences in mineral elements content and its distribution between male and female P. cathayana seedlings although similar ratio patterns of these elements contents were found in root, stem and leaf for two sexes.