松嫩平原草原5种耐盐牧草体内K^＋,Na^＋的分布与积累的研究  

THE DISTRIBUTION AND ACCUMULATION OF K￣+ AND Na￣+ IN FIVE SALT-TOLERANT FORAGE PLANTSIN A SONG-NEN PLAIN STEPPE

作　　者：殷立娟[1] 石德成[1] 薛萍[1] 

机构地区：[1]东北师范大学草地所

出　　处：《植物生态学报》1994年第1期34-40,共7页Chinese Journal of Plant Ecology

摘　　要：本文对松嫩平原盐碱化草地生长的５种耐盐收草羊草（Ａｎｅｕｒｏｌｅｐｉｄｉｕｍｃｈｉｎｅｎｓｅ）、星星草（Ｐｕｅｅｉｎｅｌｉａｔｅｎｕｉｆｌｏｒａ）、虎尾草（Ｃｈｌｏｒｉｓｖｉｒｇａｉａ）、獐茅（Ａｅｌｕｒｏｐｕｓｌｉｔｔｏｒａｌｉｓｖａｒ．ｓｆｎｅｎｓｉｓ）和碱蓬（Ｓｕａｅｄａｇｌａｕｃａ）体内Ｋ￣＋、Ｎａ￣＋的积累与分布动态进行研究。结果表明，植物体内含量Ｎａ￣＋μｍｏｌ／克干重，碱莲最高为５４１９－５６６８，其次是獐毛为２２５－３２６和星星草为１７７－２１６，虎尾草和羊草变化较大，分别为２０－６９９和１１－２１７。体内Ｎａ￣＋含量受土壤中Ｎａ￣＋水平的影响。Ｎａ￣＋／Ｋ￣＋以碱蓬最大为１０．４７－２５．７４。随着土壤盐含量（ｘ＿１）、ｐＨ（ｘ＿２）的增加，羊草和虎尾草体内Ｎａ￣＋μｍｏｌ／克于重（Ｙ）积累动态符合公式，碱蓬、星星草獐毛符合公式Ｙ＝ａ＋ｂ＿１ｘ＿１＋ｂ＿２ｘ＿２。植物体内Ｎａ￣＋的积累率依次为：虎尾草＞羊草＞星星草、獐毛和碱蓬。Ｋ￣＋主要分布在代谢旺盛的幼嫩组织中。茎叶是Ｎａ￣＋的主要积累部位。虎尾草各部位Ｎａ￣＋的积累率均呈显著增大，同时Ｋ￣＋均降低，碱蓬各部位Ｋ￣＋积累率均随Ｎａ￣＋积?The patterns of accumulation and distribution of K￣+ and Na￣+ in the tissues of Aneurolepidium chinense(Kitag),Puccinellia tenuiflora(scribn. et Merr.),Chloris virgata(SW.), Aelirepus litoralis var.sinensis and Suaeda glauca(Bunge)in a saline grassland of Song-Nen Plain were discussed.Theresults sliowed that S. glauca had the highest Na￣+ concentration(5, 491. 0μmol Na/g dw),followed by A. litoralis and P. tenuiflora which had 225.85 and 177.7μmol Na/g.dw,respectively. The lowest levels were found in A chinense and C. pirgata which contained 20.2 and 11.31 μmol Na/g.dw,respectively. The Na￣+ content of these species was correlated with the levels of Na￣+ in the soil. The Na/K ratio was highest in S. glauca(25.74)and lowest in C. virgata(0.028)。The sodium accumulation(y=μmol Na/g dw)in A. chinense and C. pirgata could be best described by an equation,where x_1 is the soil salt content and x_2 is the soil PH. In S. glauca,P. tenuifora and A. litoralis, the Na￣+ccumulation was described by the equation y=a+b_1x_1+b_2x_2. The Na￣+ accumulation rate, which was defined as the % increase in the Na￣+ concentration in the tissues of grass for every 0.1 % increase in the soil salt content,followed the order of C. virgata>A. chinense>P,tenuwora,A. Litoralis var.sinensis and S. glauca。The younger tissues.having a more active metabolism,were found to be the major sinks of accumulated Na￣+ with increasing soil salinity.The Na￣+ accumulation rate in C,virgata was marke-dly increased in different plant tissues,while K￣+ content decreased with the increase in the Na￣+ accumulation rate. However,in S. glauca the rate of K￣+ accumulation increased with the increased in the rate of Na￣+ accumula-Tion.

关 键 词：盐生植物 草原 钾 钠 积累 分布 

分 类 号：Q948.158[生物学—植物学]