CAJ | 학술논문

干旱区草地土壤无机碳(SIC)分布特征对研究干旱区草地生态系统碳循环具有重要作用.基于新疆伊犁地区6种典型草地土壤剖面无机碳含量的实测数据,分析了不同类型草地的 SIC 分布特征及其影响因素.结果表明,0~100 cm 土壤深度内,SIC 含量随着海拔的升高而降低(P ＜0．05),表现为高寒草甸＜温性山地草甸＜温性草甸草原＜温性草原＜温性荒漠草原＜温性荒漠；从土壤剖面垂直变化来看,除高寒草甸随着土层深度的加深无明显变化外,其他各类型草地 SIC 含量均随着土层深度的加深而增大.土壤无机碳密度(SICD)随着海拔的升高而降低,随土层深度的加深呈增加趋势；各类型草地土壤无机碳主要分布在底层(50~100 cm),所占比例达67．1％~86．5％；100 cm 内,SICD 为0．30~19．30 kg/m2,平均 SICD 为12．21 kg/m2.SIC 含量与土壤容重随着土层深度的加深相关性逐渐增大,在20~100 cm 达到极显著正相关；而与土壤 pH 值间表现出极显著正相关,与土壤电导率(EC)仅在土层20~30 cm 达到极显著正相关.
간한구초지토양무궤탄(SIC)분포특정대연구간한구초지생태계통탄순배구유중요작용.기우신강이리지구6충전형초지토양부면무궤탄함량적실측수거,분석료불동류형초지적 SIC 분포특정급기영향인소.결과표명,0~100 cm 토양심도내,SIC 함량수착해발적승고이강저(P ＜0．05),표현위고한초전＜온성산지초전＜온성초전초원＜온성초원＜온성황막초원＜온성황막；종토양부면수직변화래간,제고한초전수착토층심도적가심무명현변화외,기타각류형초지 SIC 함량균수착토층심도적가심이증대.토양무궤탄밀도(SICD)수착해발적승고이강저,수토층심도적가심정증가추세；각류형초지토양무궤탄주요분포재저층(50~100 cm),소점비례체67．1％~86．5％；100 cm 내,SICD 위0．30~19．30 kg/m2,평균 SICD 위12．21 kg/m2.SIC 함량여토양용중수착토층심도적가심상관성축점증대,재20~100 cm 체도겁현저정상관；이여토양 pH 치간표현출겁현저정상관,여토양전도솔(EC)부재토층20~30 cm 체도겁현저정상관.
Soil inorganic carbon (SIC)distribution of arid grassland plays an important role to the re-search of the grassland ecosystem carbon cycle in arid areas.In this paper,based on six kinds of typical grassland soil profile data of Ili.The SIC distribution and its influencing factors of different types of grass-land were analyzed.The results showed that:Within 0-100 cm,SIC content decreases with increasing alti-tude (P < 0.05):alpine meadow<temperate mountain meadow<temperate meadow steppe<temperate steppe<temperate desert steppe<temperate desert;SIC content of Alpine meadow has no obvious change with the soil depth increases,other various types of grassland SIC content were increased with the deepness of soil layer.Soil inorganic carbon density also decreases with altitude increasing,has an increasing trend with soil depth increasing,the percent of soil inorganic carbon is 67.1%-86.5% concentrated in the under-lying (50-100 cm);SIC density on the whole profile of range from 0.30 kg/m2 to 1 9.30 kg/m2 ,with an average density of 12.21 kg/m2 .Correlation between SIC content and soil bulk density with soil depth in-creases,very significant positive at 20-100 cm,as for pH showed a significant positive correlation.And has very significant positive correlation with soil electrical conductivity (EC)in soil 20-30 cm.