不同物候期枣树细根和叶片可溶性糖、蛋白和C、N、P含量的变化

Phenological Change of Soluble Sugar,Protein and C,N,P Content in the Fine Root and Leaf of Chinese Jujube

以陕北‘七月鲜’枣树为材料,研究不同物候期(萌芽期、展叶初期、展叶中期、全叶期、果实成熟期、落叶期)细根和叶中可溶性糖、蛋白以及C、N、P的含量变化规律。结果表明:(1)随着根序增大,细根中可溶性糖、蛋白、有机C含量均呈增加趋势,全N和全P含量呈降低趋势;(2)不同物候期细根中可溶性糖和蛋白含量呈"W"变化趋势,叶中呈先上升后下降的态势;(3)细根的有机C含量呈先降低后增加的趋势,最低值出现在果实成熟期,叶呈先降低后增加再降低的趋势,最低值出现在展叶中期;(4)细根的全N含量呈先降低后增加的趋势,叶呈先降低后增加再降低,在全叶期和落叶期含量较低;(5)细根的全P含量呈先降低后增加再降低的趋势,叶持续降低,直到落叶期有所增加;(6)细根与叶片的可溶性糖、可溶性蛋白和C、N、P之间的相关性不显著,细根与叶片的各指标之间相互关系有待进一步研究。

We used Qiyuexian Chinese jujube trees to study the varying patterns of soluble sugar, protein, and C, N, P in the fine roots and leaves from different phenological periods （germination stage, leaf extension early stage, leaf extension middle stage, whole leaf stage, fruit maturation stage, defoliation stage） . The results showed that： （ 1 ） The contents of soluble sugar, protein and organic carbon increased with increasing root order, whereas the content of total nitrogen and total phosphorus decreased; （2） Soluble sugar and protein contents in fine roots changed as a ＂W＂ curve, first increasing and then decreasing in the leaves; （3） Organic carbon content in fine roots decreased until the fruit reached a mature stage and then increased, decreasing initially and then increasing, and decreasing again in the leaves; the lowest value was observed in the middle of the leaf extension stage; （4）Total nitrogen content in fine roots first decreased and then increased, decreasing again in the leaves; the lowest value was observed in the whole leaf and defoliation stages; （5） Total phosphorus content initially decreased and then increased, followed by another decrease in fine roots, which continued in the leaves until the defoliation period and then increased; （6） The contents of soluble sugar, protein, organic carbon, total nitrogen and total potassium in fine root had no obvious correlation with leaf, which need be studied deeply.