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| Spatio-temporal Variations and Interrelationships of Wheat Yield and Soil Organic Carbon Density at a County Scale |
| Received:March 29, 2015 |
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| KeyWord:crop yield;SOCD;spatial and temporal variability |
| Author Name | Affiliation | E-mail | | LI Na-na | Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | | | WANG Rui | Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource, Yangling 712100, China | | | ZHANG Yan-jun | Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | | | WANG Zhi-qi | Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | | | LI Ru-jian | Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China | | | LI Jun-chao | Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource, Yangling 712100, China | | | GUO Sheng-li | Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, China
Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resource, Yangling 712100, China
College of Resources and Environment, Northwest A&F University, Yangling 712100, China | slguo@ms.iswc.ac.cn |
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| Abstract: |
| Soil property and plant growth exist spatial and temporal variations due to the unevenness of effects of natural and human factors across a region. This study investigated the spatio-temporal variations in wheat production and soil organic carbon density(SOCD) in surface soil(0~20 cm) at a county scale(Ledu, Qinghai Province). Wheat yield and SOCD had significant spatial patterns at county scale. However, they showed an opposite spatial distributions in the 1980s and 2000s:the lowest SOCD found in the high-yield fields and the highest SOCD observed in the low-yield fields. From the 1980s to the 2000s, wheat yield had a slight increase of only 0.5%, while SOCD increased by 11.5% in the high-yield fields; wheat yield was increased by 12.9%, but SOCD were decreased by 24.6% in the middle-yield fields; and wheat yield was elevated by 18.9% while SOCD were lowered by 29.8% in the low-yield fields. Topography and land use were the dominant factors influencing the relationships between SOCD and crop yields at county scale. |
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