藜麦(Chenopodium quinoa)是南美洲传统作物,具有极高的营养价值和较强的环境适应能力,但其在我国西北干旱区的适应性还有待深入研究。生态化学计量学是对有机体的元素组成(主要是C、N、P)及其关系进行研究的科学,能一定程度地反映有机体的特征及其与环境的关系。在河西走廊大田栽培条件下,本试验研究了藜麦主要物候期的碳(C)、氮(N)、磷(P)含量及其生态化学计量比的变化。结果表明:随物候期的变化,藜麦的有机碳(organic carbon,OC)含量变化不显著,而全氮(total nitrogen,TN)和全磷(total phosphorus,TP)含量则显著降低;各器官间的OC含量较稳定, 而TN和TP含量差异显著且叶和穗较高。藜麦的C∶N、C∶P随物候期的变化呈升高趋势,N∶P则呈先降低后显著升高趋势;根和茎C∶N、C∶P较高而叶N∶P较高。物候期和器官显著影响藜麦的C、N、P含量和计量比,后者与藜麦的生长和物质积累速度显著相关。
Chenopodium quinoa is a traditional crop in South America with its high nutritional value and strong environmental adaptability,while its adaptability in arid area of northwest China needs to be further studied.Ecological stoichiometry is the study of the elemental composition of organisms (mainly C,N,P) and their relationships,and it can be used to reflect the characteristics of organisms and their relationship with environment.The changes of contents of carbon (C),nitrogen (N) and phosphorus (P) and stoichiometric ratio at different phonological phases of C.quinoa were studied in a field trial in the Hexi Corridor.The organic carbon (OC) content hardly changed with the change of phenological phases,while the contents of total nitrogen (TN) and total phosphorus (TP) decreased significantly.There was no difference of OC content among organs,while the contents of TN and TP were significantly different with higher values in leaves and spikes.The C∶N and C∶P tended to increase with the plant growth,while N∶P decreased at first and then increased significantly.The C∶N and C∶P in roots and stems were higher than those in leaves and spikes,while N∶P in leaves was higher.The contents and stoichiometric ratios of C,N and P of C.quinoa were significantly affected by phenological phases and organs,showing the very close links with the growth and accumulation rate of dry matter.
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