A comparison of proton excretion of twelve pasture legumes grown in nutrient solution
A comparison of proton excretion of twelve pasture legumes grown in nutrient solution
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DOI：
10.1071/ea96151
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发表时间：
1997
影响因子：
--
通讯作者：
Caixian Tang;L. Barton;C. Mclay
中科院分区：
文献类型：
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作者：
Caixian Tang;L. Barton;C. Mclay
摘要：使用豆类植物来提高牧场的生产力通常与土壤酸化的增加有关。本研究比较了12个固氮牧草豆科植物种/基因型的酸化潜力，采用溶液培养法。选择豆类是因为它们在澳大利亚南部地中海地区的农业系统中的用途或潜在用途。种植的物种是三叶草（Trifolium submandrieum L.）（vars.达尔基斯，亚鲁普和克莱尔），三叶草，Trifolium tomentosum L.，紫花苜蓿，多形苜蓿，蒺藜苜蓿，Ornithopus compressus L.，Ornithopus sativus Brot.，泡叶车轴草和三叶草。在萌发后第40天至第61天的21天期间测量质子排泄。不同物种和基因型的质子排泄到溶液中的量在143和265 cmol H+ /kg干物质之间变化。总的来说，T. tomentosum和T.小球苜蓿单位生物量的质子排泄量高于苜蓿和T.而这反过来又比Ornithopus物种分泌更多的质子。每千克生物量的质子排泄量与所有物种中植物中过量阳离子的浓度和灰分碱度之间存在良好的相关性。总酸产量与过量阳离子和灰分碱度的积累，总干物质生产和总固氮在研究期间高度相关。因此，在引进豆科牧草新品种时，应考虑其潜在的质子排泄能力。
Summary.The use of legumes to improve the productivity of pastures has usually been associated with an increase in soil acidification. The present study compared the acidification potential of 12 N2-fixing pasture legume species/genotypes using a solution culture assay. The legumes were chosen because of their use or potential use in farming systems in the mediterranean zones of southern Australia. The species grown were Trifolium subterraneum L. (vars. Dalkeith, Yarloop and Clare), Trifolium glomeratum L., Trifolium tomentosum L., Medicago murex Willd., Medicago polymorpha L., Medicago truncatulaGaertn., Ornithopus compressus L., Ornithopus sativusBrot., Trifolium vesiculosum and Trifolium balansae. Proton excretion was measured over a period of 21 days from days 40 to 61 after germination. The amount of protons excreted into solution varied between 143 and 265 cmol H+ /kg dry matter for the different species and genotypes. In general, T. tomentosum and T. glomeratum excreted greater amounts of protons per unit biomass than Medicago species and T. subterraneum, which, in turn, excreted more protons than Ornithopus species. The amount of proton excreted per kilogram biomass was well correlated with the concentrations of excess cations over anions and ash alkalinity in plants across all the species. Total acid production was highly correlated with accumulation of excess cations and ash alkalinity, total dry matter production and total nitrogen fixation during the study period. It is suggested that the potential proton excretion by new pasture legume species should be considered when they are introduced into farming systems.