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

doi:10.11686/cyxb20140430

摘要/Abstract

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。

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 NH4+N and NO3-N concentrations respectively. There was an obvious change between the different degrees of grassland degradation in ground plant species, coverage, height, biomass, and NO3N and NH4+N concentrations which showed a decreasing tendency in the sequence fenced natural grassland＞unfenced natural grassland＞driveway at the same soil depth. NO3-N and NH4+N concentrations decreased with soil depth in comparable disturbed habitats. From April to October NO3-N and NH4+N concentrations initially increased but then decreased and had a peak value in August. There was no significant difference in fenced soil NH4+N concentrations between August and October. In October, NO3N concentration increased in unfenced natural grassland. There were positive correlations between aboveground biomass and NH4+N, NO3-N under the three kinds of disturbed habitats.

中图分类号:

S812.29

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.

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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