CAJ | 학술논문

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。
위료해불동간우생경하고한생태취약구초지식피、토양무궤담소함량변화특정，이천축고한초지위대상，선취3충간우생경（위란내천연초지、위란외천연초지이급목도），측정화분석불동계절、불동토양심도안태담화초태담함량변화특정。결과표명，불동간우생경，지상식물충류、개도、고도급생물량등변화명현；상동토층심도，안태담、초태담함량표현위위란내＞위란외＞목도。상동간우생경토양안태담、초태담함량수토층심도증가이강저，차변화폭도교대，0～10 cm여20～30 cm 토층간차이현저；토양안태담、초태담함량종4월도10월정현선증가후감소적추세，병재8월출현봉치，위란내토양안태담함량8월여10월무현저차이，위란외토양초태담함량10월승고。3충간우생경하안태담、초태담동지상생물량지간균정정상관관계。
Characteristics of vegetation and soil inorganic nitrogen concentrations under different disturbed habi-tats (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 concen-trations 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 de-creasing 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 Au-gust and October.In October,NO3-N concentration increased in unfenced natural grassland.There were posi-tive correlations between aboveground biomass and NH4 +-N,NO3 --N under the three kinds of disturbed habi-tats .