Long-Term Grazing Exclusion Improves the Composition and Stability of Soil Organic Matter in Inner Mongolian Grasslands
Wang, CY; He, NP; Zhang, JJ; Lv, YL; Wang, L
2015
Source PublicationPLOS ONE
ISSN1932-6203
Volume10Issue:6Pages:-
AbstractAlteration of the composition of soil organic matter (SOM) in Inner Mongolian grassland soils associated with the duration of grazing exclusion (GE) has been considered an important index for evaluating the restoring effects of GE practice. By using five plots from a grassland succession series from free grazing to 31-year GE, we measured the content of soil organic carbon (SOC), humic acid carbon (HAC), fulvic acid carbon (FAC), humin carbon (HUC), and humic acid structure to evaluate the changes in SOM composition. The results showed that SOC, HUC, and the ratios of HAC/FAC and HAC/extractable humus carbon (C) increased significantly with prolonged GE duration, and their relationships can be well fitted by positive exponential equations, except for FAC. In contrast, the HAC content increased logarithmically with prolonged GE duration. Long-term GE enhanced the content of SOC and soil humification, which was obvious after more than 10 years of GE. Solid-state C-13 nuclear magnetic resonance spectroscopy showed that the ratios of alkyl C/O- alkyl C first decreased, and then remained stable with prolonged GE. Alternately, the ratios of aromaticity and hydrophobicity first increased, and then were maintained at relatively stable levels. Thus, a decade of GE improved the composition and structure of SOM in semiarid grassland soil and made it more stable. These findings provide new evidence to support the positive effects of long-term GE on soil SOC sequestration in the Inner Mongolian grasslands, in view of the improvement of SOM structure and stability.
SubtypeJournal
Subject AreaScience & Technology - Other Topics
WOS Subject ExtendedMultidisciplinary Sciences
WOS KeywordDIFFERENT LAND USES ; HUMIC SUBSTANCES ; NORTHERN CHINA ; AGGREGATE STABILITY ; FOREST ECOSYSTEMS ; CARBON FRACTIONS ; NITROGEN ; DYNAMICS ; STORAGE ; DRIVEN
Indexed BySCI
Language英语
WOS IDWOS:000356349000032
PublisherPUBLIC LIBRARY SCIENCE
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/44408
Collection生态系统网络观测与模拟院重点实验室_生态网络实验室
Recommended Citation
GB/T 7714
Wang, CY,He, NP,Zhang, JJ,et al. Long-Term Grazing Exclusion Improves the Composition and Stability of Soil Organic Matter in Inner Mongolian Grasslands[J]. PLOS ONE,2015,10(6):-.
APA Wang, CY,He, NP,Zhang, JJ,Lv, YL,&Wang, L.(2015).Long-Term Grazing Exclusion Improves the Composition and Stability of Soil Organic Matter in Inner Mongolian Grasslands.PLOS ONE,10(6),-.
MLA Wang, CY,et al."Long-Term Grazing Exclusion Improves the Composition and Stability of Soil Organic Matter in Inner Mongolian Grasslands".PLOS ONE 10.6(2015):-.
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