| Factors affecting soil organic carbon in cropland and their regulation |
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| DOI：10.7606/j.issn.1000-7601.2008.03.36 |
| Key Words: soil organic carbon tillage water nutrient soil-surface mulching |
| Author Name | Affiliation | | LI Xiaohan | College of Resources and Environment Northwest A ＆ F University, Yangling, Shaanxi 712100, China | | HAO Mingde | College of Resources and Environment Northwest A ＆ F University, Yangling, Shaanxi 712100, China；Institute of Soil and Water Conservation CAS, Yangling, Shaanxi 712100, China | | WANG Zhaohui | College of Resources and Environment Northwest A ＆ F University, Yangling, Shaanxi 712100, China | | LI Lili | College of Resources and Environment Northwest A ＆ F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| The increase of greenhouse gas such as N2O and CO2 has been proved to be the main factors leading global war ming effects. Emission of CO2 caused by agricultural productionis found to account for 25％ of the total carbon emission. Therefore investigations of factors affecting soil organic C are of great i mportance for increasing C sequestration and retention in agricultural soil system?decreasing C emission caused unreasonable land utilization and ensuring the sustainable development of agricultural and biospherical ecosystems. This paper discussed effects from factors such as temperature water land reclamation fallowing tillage rotation straw retention and fertilizer management in order to rationalize land use and management. Reduce of tillage increase of crop straw retention and opti mization of N,P and K fertilizer rate and ratio are proved to be ani mportant ways to increase soil organic C content and its fertility and quality. |
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