| 不同种植年限人工苜蓿草地植物和土壤化学计量特征 |
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| 引用本文： | 杨菁,谢应忠,吴旭东,徐坤.不同种植年限人工苜蓿草地植物和土壤化学计量特征[J].草业学报,2014,23(2):340-345. |
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| 作者姓名： | 杨菁 谢应忠 吴旭东 徐坤 |
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| 作者单位： | 1.宁夏大学西北土地退化与生态恢复国家重点实验室培育基地,宁夏 银川 750021;2.宁夏大学草业科学研究所,宁夏 银川 750021 |
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| 基金项目： | 国家973计划前期研究项目(2010CB34805)资助。 |
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| 摘 要： | 通过测定并分析不同种植年限(种植1,3,4,5及8年)人工苜蓿草地苜蓿叶片、茎秆及0~20 cm土壤中C、N、P含量及其化学计量比,研究了种植年限对人工苜蓿草地土壤及植物养分含量及其化学计量比的影响。结果表明,1)0~20 cm土壤C、N含量随种植年限的增加,呈先增后减的趋势,P含量与之相反,各年限间有显著差异(P<0.05)。2)随种植年限的增加,苜蓿叶片C含量总体呈下降趋势,P含量先升后降。茎中各养分的变化规律与土壤养分变化规律相似,变化幅度小于叶片养分。3)苜蓿叶片N∶P及C∶P与叶片P含量显著负相关,与叶片N含量无显著相关性,土壤P与茎的C、N、P及化学计量比均有一定相关性。
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| 关 键 词： | 化学计量学 种植年限 苜蓿 土壤 |
| 收稿时间： | 2013-08-22 |
Stoichiometry characteristics of plant and soil in alfalfa grassland with different growing years |
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| YANG Jing,XIE Ying-zhong,WU Xu-dong,XU Kun.Stoichiometry characteristics of plant and soil in alfalfa grassland with different growing years[J].Acta Prataculturae Sinica,2014,23(2):340-345. |
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| Authors: | YANG Jing XIE Ying-zhong WU Xu-dong XU Kun |
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| Institution: | 1. Breeding Base of State Key Laboratory for Preventing Land Degradation and Ecological Restoration, Ningxia University, Yinchuan 750021, China;2. Institute of Grassland Sciences, Ningxia University, Yinchuan 750021, China |
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| Abstract: | Through measuring and analyzing carbon (C), nitrogen (N), phosphorus (P), and its stoichiometry ratios of leaf, stem and 0-20 cm soil under different plant ages (1, 3, 4, 5 to 8 years) of alfalfa at the foot of Helan Mountain in Ningxia, the influence of planting-age on nutrient content and stoichiometry of soil and plant in alfalfa grassland were researched. 1)With the increase of plant time, 0-20 cm soil C and N firstly increase and then descend, but the P is contrary. There were significant differences between different planting-age (P<0.05). 2)The C in leaf decreased and P in leaf decreased after increase with the increasing of plant time. Each of stem nutrient content change as well as soil nutrient content, but the amplitude of variation is less than leaf nutrient content. 3) The N/P and C/P in leaf showed a negative correlation with P in leaf, but showed no correlation with N in leaf. There were a certain correlation between P in soil and C, N, P and its stoichiometry in stem. |
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