| 自然条件下大针茅草原几种主要植物氮、磷、钾、铁含量的季节动态 |
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| 引用本文： | 陈佐忠,黄德华.自然条件下大针茅草原几种主要植物氮、磷、钾、铁含量的季节动态[J].植物生态学报,1989,13(4):325-331. |
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| 作者姓名： | 陈佐忠 黄德华 |
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| 作者单位： | 中国科学院植物研究所
(陈佐忠)，中国科学院植物研究所(黄德华) |
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| 摘 要： | 1．禾草与非禾草植物粗蛋白质含磷量季节动态有共同趋势。在生长期5—10月有两个高峰值，即双峰型，第一次是返青后，另一次是雨季后。其含量的动态特征与其生长发育节律有关。由于降水影响其生长发育节律，故含量动态与气候条件有关。植物中粗蛋白质含量与含磷量成直线回归关系。 2．禾草与非禾草植物灰分含量动态有不同特点。禾草植物灰分含量为“浓缩型”，后期较高，但其变幅不像氮、磷那么大。而非禾单植物动态不甚明显。 3．目前这种季节打草所贮干草其含磷量缺乏是显而易见的。
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| 关 键 词： | 季节动态 营养物质 草原 |
SEASONAL VARIATIONS OF NUTRITIONAL COMPOSITION OF 9 RANGE PLANTS IN STIPA GRANDIS STEPPE |
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| Chen Zuo-zhong Huang De-hua.SEASONAL VARIATIONS OF NUTRITIONAL COMPOSITION OF 9 RANGE PLANTS IN STIPA GRANDIS STEPPE[J].Acta Phytoecologica Sinica,1989,13(4):325-331. |
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| Authors: | Chen Zuo-zhong Huang De-hua |
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| Abstract: | The seasonal variations in the N, P, K, Fe and ash contents of 9range plants were studied by half-monthly samplings from the same sitein the Stipa grandis steppe at the Inner Mongolia Grassland EcosystemResearch Station (GERS)from May to October, 1981. Trends in crude pr-otein(CP)and P were similar in grass and nongrass plants. Highest conce-ntrations occurred at the ends of May and June, and the lowest in Octo-ber. The seasonal variations were related with the growth rhythm of pl-ant. Because precipitation affects the growth rhythm of plant, so it inf-luences the seasonal variations of nutritional composition. The ash var-iations are different for grass and woody plant. The variations of grassbelong to the concentrated type and its concentration in the later stageis less than in the earlier one; but the variations of woody plant is tnoso marked. There is authentic regression interrelation between the crudeprotein concentration and the phosphorus concertration. The P concentr-ation of harvested grass is lower because its concentration in harvestperiod was low. |
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| Keywords: | Seasonal variation Nutritional composition Steppe |
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