Dong Yunshe1; Peng Qin1; Xiao Shengsheng1; He Yating1; Liu Xinchao1; Sun Liangjie1; Jia Junqiang1; Yang Zhijie2; Qi Yuchun1
Source Publicationjournalofgeographicalsciences
AbstractCultivation is one of the most important human activities affecting the grassland ecosystem besides grazing, but its impacts on soil total organic carbon (C), especially on the liable organic C fractions have not been fully understood yet. In this paper, the role of cropping in soil organic C pool of different fractions was investigated in a meadow steppe region in Inner Mongolia of China, and the relationships between different C fractions were also discussed. The results indicated that the concentrations of different C fractions at steppe and cultivated land all decreased progressively with soil depth. After the conversion from steppe to spring wheat field for 36 years, total organic carbon (TOC) concentration at the 0 to 100 cm soil depth has decreased by 12.3% to 28.2%, and TOC of the surface soil horizon, especially those of 0-30 cm decreased more significantly (p<0.01). The dissolved organic carbon (DOC) and microbial biomass carbon (MBC) at the depth of 0-40 cm were found to have decreased by 66.7% to 77.1% and 36.5% to 42.4%, respectively. In the S.baicalensis steppe, the ratios of soil DOC to TOC varied between 0.52% and 0.60%, and those in the spring wheat field were only in the range of 0.18%-0.20%. The microbial quotients (qMBs) in the spring wheat field, varying from 1.11% to 1.40%, were also lower than those in the S. baicalensis steppe, which were in the range of 1.50%-1.63%. The change of DOC was much more sensitive to cultivation disturbance. Soil TOC, DOC, and MBC were significantly positive correlated with each other in the S. baicalensis steppe, but in the spring wheat field, the correlativity between DOC and TOC and that between DOC and MBC did not reach the significance level of 0.05.
Document Type期刊论文
First Author Affilication中国科学院地理科学与资源研究所
Recommended Citation
GB/T 7714
Dong Yunshe,Peng Qin,Xiao Shengsheng,et al. effectsofaconversionfromgrasslandtocroplandonthedifferentsoilorganiccarbonfractionsininnermongoliachina[J]. journalofgeographicalsciences,2012,22(2):315.
APA Dong Yunshe.,Peng Qin.,Xiao Shengsheng.,He Yating.,Liu Xinchao.,...&Qi Yuchun.(2012).effectsofaconversionfromgrasslandtocroplandonthedifferentsoilorganiccarbonfractionsininnermongoliachina.journalofgeographicalsciences,22(2),315.
MLA Dong Yunshe,et al."effectsofaconversionfromgrasslandtocroplandonthedifferentsoilorganiccarbonfractionsininnermongoliachina".journalofgeographicalsciences 22.2(2012):315.
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