| 高寒生态脆弱区不同扰动生境草地植被及土壤无机氮变化特征 |
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| 引用本文： | 张玉霞,姚拓,王国基,马文文,马文彬.高寒生态脆弱区不同扰动生境草地植被及土壤无机氮变化特征[J].草业学报,2014,23(4):245-252. |
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| 作者姓名： | 张玉霞 姚拓 王国基 马文文 马文彬 |
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| 作者单位： | 甘肃农业大学草业学院草业生态系统教育部重点实验室,甘肃兰州730070 |
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| 基金项目： | 国家自然基金(31360584),甘肃省农业科技创新项目(GNCX-2012-45)和现代农业产业技术体系(CARS-35)资助 |
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| 摘 要： | 为了解不同干扰生境下高寒生态脆弱区草地植被、土壤无机氮素含量变化特征,以天祝高寒草地为对象,选取3种干扰生境(围栏内天然草地、围栏外天然草地以及牧道),测定和分析不同季节、不同土壤深度铵态氮和硝态氮含量变化特征。结果表明,不同干扰生境,地上植物种类、盖度、高度及生物量等变化明显;相同土层深度,铵态氮、硝态氮含量表现为围栏内>围栏外>牧道。相同干扰生境土壤铵态氮、硝态氮含量随土层深度增加而降低,且变化幅度较大,0~10 cm与20~30 cm土层间差异显著;土壤铵态氮、硝态氮含量从4月到10月呈现先增加后减少的趋势,并在8月出现峰值,围栏内土壤铵态氮含量8月与10月无显著差异,围栏外土壤硝态氮含量10月升高。3种干扰生境下铵态氮、硝态氮同地上生物量之间均呈正相关关系。
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| 关 键 词： | 高寒草地 植被 铵态氮 硝态氮 空间动态 季节动态 |
| 收稿时间： | 2013-08-22 |
Characteristics of vegetation and soil inorganic nitrogen concentrations under different disturbed habitats in a weak alpine ecosystem |
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| ZHANG Yu-xia,YAO Tuo,WANG Guo-ji,MA Wen-wen,MA Wen-bin.Characteristics of vegetation and soil inorganic nitrogen concentrations under different disturbed habitats in a weak alpine ecosystem[J].Acta Prataculturae Sinica,2014,23(4):245-252. |
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| Authors: | ZHANG Yu-xia YAO Tuo WANG Guo-ji MA Wen-wen MA Wen-bin |
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| Institution: | Pratacultural College,Key Laboratory of Grassland Ecosystem,Ministry of Education,Gansu Agricultural University,Lanzhou 730070,China |
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| Abstract: | Characteristics of vegetation and soil inorganic nitrogen concentrations under different disturbed habitats (fenced natural grassland, unfenced natural grassland and driveways) were determined and analyzed in a weak alpine grassland ecosystem of Tianzhu. Characteristics were based on field survey for vegetation and the indophenol blue colorimetric method and dual wavelength spectrophotometry for NH4+ N and NO3- N concentrations respectively. There was an obvious change between the different degrees of grassland degradation in ground plant species, coverage, height, biomass, and NO3 N and NH4+ N concentrations which showed a decreasing tendency in the sequence fenced natural grassland＞unfenced natural grassland＞driveway at the same soil depth. NO3- N and NH4+ N concentrations decreased with soil depth in comparable disturbed habitats. From April to October NO3- N and NH4+ N concentrations initially increased but then decreased and had a peak value in August. There was no significant difference in fenced soil NH4+ N concentrations between August and October. In October, NO3 N concentration increased in unfenced natural grassland. There were positive correlations between aboveground biomass and NH4+ N, NO3- N under the three kinds of disturbed habitats. |
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