| Characteristics of organic carbon and soil properties in Binggou valley at upstream of Heihe river |
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| DOI：10.7606/j.issn.1000-7601.2013.05.034 |
| Key Words: upstream of Heihe River Binggou Valley soil organic carbon (SOC) soil properties |
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| Abstract: |
| Based on the method of field sampling and laboratory analysis, the relationship between distribution of organic carbon and soil properties was investigated for four kinds of soil in Binggou Valley at the upstream of Heihe River, so as to provide a scientific basis for local water conservation. The results showed that the content and density of organic carbon in whole profile of the four tested soils were consistently ordered as: gray brown forest soil＞alpine scrub meadow soil＞alpine meadow soil＞mountain chestnut soil, and they decreased with the increase of soil depth, which indicated that the gray brown forest soil was more beneficial to the storage and accumulation of organic carbon than other soils in Binggou Valley. The density of organic carbon in 0～10 cm depth of gray brown forest soil was 4.54 kg·m-2, being slightly higher than the average value (4.24 kg·m-2) in 0～10 cm depth of forest soil in China, which indicated that there was a relatively abundant litter biomass in the gray brown forest soil in Binggou Valley because of the plentiful rainfall and the good understory vegetation. The organic carbon content in 0～10 cm of the four soils was 30.69%～37.99% of total organic carbon content in the whole soil profile, and the organic carbon density in 0～10 cm was 29.31%～36.77% of total organic carbon density in the whole soil profile, which illustrated that the soil organic carbon was largely concentrated in the surface soil in Bingg
ou Valley, and its storage capacity was easily lowered by unreasonable human activities as a result of soil and water erosion. Therefore, the vegetation coverage should be improved so as to protect the ecological environment and to reduce soil and water erosion in this region. With the increase of depth in profile of the four soils, the organic carbon content, total N content, CEC, field water capacity and aggregate percentage tended to decrease, while the soil bulk density and pH tended to rise. The regression statistical analysis showed the organic carbon content in the four soils was positively correlated with field water capacity, aggregate percentage, total N content and CEC, but was negatively correlated with soil bulk density and pH, being basically consistent with the results of many researchers. |
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