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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (4): 1078-1083    DOI: 10.7522/j.issn.1000-694X.2013.00152
Biology and Soil     
Field-scale Spatial and Temporal Variation of Soil Organic Carbon in a Reclaimed Sandy Farmland
YANG Rong1,2, SU Yong-zhong1, WANG Min1, DU Ming-wu1, YANG Xiao1, LEI Yao-hu3
1.Linze Inland River Basin Research Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy Sciences, Lanzhou 730000, China;
2.Key Laboratory of Arid-Land Crop Science in Gansu Province, Gansu Agricultural University, Lanzhou 730000, China;
3.Gansu Land-reclaimable and Agriculture Research Institute, Wuwei 733033, China
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Abstract  

At the marginal regions of the Linze Oasis in Hexi corridor, a study was conducted to proclaim the field-scale spatial and temporal variation characteristic of soil organic carbon in a reclaimed sandy farmland. The results showed that according to the data collected from tests of spatial variation, the content of soil organic carbon ranged from 2.66 to 6.90 g·kg-1, and the average content and variation coefficient of soil organic carbon were 4.45 g·kg-1 and 24.5%, respectively. The exponential model was fitted to the semivariograms of soil organic carbon. The nugget(C0), sill(C0+C), C/(C0+C) and range were 0.13, 1.28, 0.90 and 18.24 m, respectively. Significant positive correlations were observed between soil organic carbon and total nitrogen, available nitrogen, available phosphorus, available potassium, electricity conductivity, and significant negative correlation were observed between soil organic carbon and pH. According to the data collected from tests of temporal variation, the annual average of soil organic carbon ranged from 3.81 to 4.71 g·kg-1, and its variation coefficient was 6.8%, indicating that the annual change of soil organic carbon in this reclaimed field was not obvious. The annual average content of soil organic carbon had significantly positive correlations with seeding rate, and negative correlation with crop yield. There were no significant correlations between soil organic carbon, nitrogen and irrigation application rate. It could be demonstrated that the soil organic carbon content of reclaimed farmland was lower than regional level. Spatial variability of soil organic in this reclaimed field was mainly affected by regional factors such as soil parent material and geography. However, to understand the effect of cropland management on evolution rule of soil organic carbon, soil monitoring needs to conduct more long in this reclaimed field.

Key words:  soil organic carbon      reclaimed field      spatial and temporal variation      oasis      nitrogen application rate     
Received:  08 May 2012      Published:  21 May 2012
ZTFLH:  S153.6  

Cite this article: 

YANG Rong1,2, SU Yong-zhong1, WANG Min1, DU Ming-wu1, YANG Xiao1, LEI Yao-hu3. Field-scale Spatial and Temporal Variation of Soil Organic Carbon in a Reclaimed Sandy Farmland. JOURNAL OF DESERT RESEARCH, 2013, 33(4): 1078-1083.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00152     OR     http://www.desert.ac.cn/EN/Y2013/V33/I4/1078

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