[1]LAN Jia-cheng,FU Wa-li,DUAN Zheng-feng,et al.Response of Soil Dissolved Organic Carbon to the Land Use and the Relations With Soil Nutrients in Karst Area[J].Research of Soil and Water Conservation,2011,18(05):76-80,86.
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Response of Soil Dissolved Organic Carbon to the Land Use and the Relations With Soil Nutrients in Karst Area
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
18
Number of periods:
2011 05
Page number:
76-80,86
Column:
Public date:
2011-10-20
- Title:
- Response of Soil Dissolved Organic Carbon to the Land Use and the Relations With Soil Nutrients in Karst Area
- CLC:
- F301.24;S153.6
- DOI:
- -
- Abstract:
- Soil samples (from the suface to 30 cm) of different land use type were collected to study the content, distribution of soil dissolved organic carbon (DOC) and its influence factors in Zhongliang Mountain, Chongqing. The results revealed that: land use type significantly affected the content and distribution of the soil DOC. The content of the soil DOC in different types of land use were orange land (425.77 mg/kg)>vegetable land (342.97 mg/kg)>slopping field (243.25 mg/kg)>shrub land (177.74 mg/kg)>grassland (145.06 mg/kg), the ratio of soil DOC in soil SOC were orange land>slopping field>vegetable land>shrub land>grassland. Regularities of the vertical distribution of soil DOC were obvious, in addition to orange land, soil DOC in the other types decreased with the increase in soil depth. Land use can change the soil properties, thereby affect the content and distribution of soil DOC. Correlation analysis showed that, in addition to orange land, soil DOC of the rest were positively correlated with soil organic carbon; the correlation between soil microbial biomass carbon and soil DOC was very significant in grassland, it meant that soil microbial biomass carbon had a great contribution to soil DOC, but the correlation of them in the other land use types was negative. Soil DOC and soil total N, hydrolysable N and available K were extremely significant. Correlation with total P was a significant positive, and their correlations were found with the coefficients of 0.421, 0.375, 0.576, 0.274, so the soil DOC can be used as an important indicator of changes in soil fertility.
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