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本文报道了大田拔节期和完熟期碱茅根系对土壤中Ｎａ＋、Ｋ＋的选择性吸收（ＳＡ）及植株各部位间Ｎａ＋、Ｋ＋的选择性运输（ＳＴ）能力，并对Ｎａ＋、Ｋ＋、Ｃａ２＋、Ｍｇ２＋、Ｃｌ－在植株各部位中的分布特性进行了研究。结果表明，完熟期碱茅的ＳＡ值是其拔节期的１．５倍，表明前者根系拒排Ｎａ＋、吸收Ｋ＋的能力强于后者；拔节期和完熟期碱茅ＳＴ２（根系：茎）值均较高，说明根系控制Ｎａ＋、促进Ｋ＋向茎部运输的能力很强，拔节期碱茅ＳＴ３（茎：叶鞘）值较低，茎对Ｎａ＋、Ｋ＋的选择性运输能力很弱，拔节期碱茅ＳＴ４（叶鞘：叶片）值介于ＳＴ１值与ＳＴ２值之间，表明叶鞘对Ｎａ＋、Ｋ＋向叶片的运输也有一定的选择能力。
This paper reports the selective absorption (SA) of Na + and K + in soil and the selective transport (ST) of Na +, K + in different parts of plants at the jointing and maturity stages of Albus mayshurica and the effects of Na +, K +, Ca2 + The distribution characteristics of Mg2 +, Cl- in various parts of the plant were studied. The results showed that the SA value at maturity stage was 1.5 times higher than that at jointing stage, indicating that the former had stronger ability of rejecting Na + and K + absorbing than the latter. At the jointing stage and maturing stage, Are higher, indicating that root control Na +, to promote the transport of K + to the stem is very strong, jointing stalk ST3 (stems: sheath) value is low, stems Na +, K + selective transport capacity is weak, jointing alkali The value of ST4 (leaf sheath: leaf) was between ST1 value and ST2 value, which indicated that leaf sheath had certain selection ability to transport Na + and K + to leaf.