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Long-term spatial and temporal variations of
soil organic carbon in the Handan region in Northern China |
| NIU Ling‘an, HAO Jinmin, ZHANG Baozhong, NIU Xinsheng, LU Zhenyu |
| Quzhou Experimental Station, China Agricultural University; |
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Abstract We carried out a long-term study and a systematic analysis on the spatial and temporal variations of the soil organic carbon contents in the counties of Handan Prefecture in Hebei Province, on the North China Plains. The analysis was based on the data collected in soil surveys conducted in 1980, 1993 and 2003, as well as the data from specific investigations using GIS and GPS receivers.The soil organic carbon content was higher in the western mountainous region than in the eastern plain region in 1980, and the difference in the average values was 17.745 t·hm-2. The soil organic carbon content was influenced by natural factors, such as climate and rainfall. In 1993, the soil organic carbon content showed an upward trend in the eastern plain region and a downward trend in the western mountainous region. The difference in the average values was 16.641 t·hm-2. The changing trend reflected the changes in farming practices where traditional farming was changed into modern farming gradually by increasing farming investment and output of grains. In 2003, the soil organic carbon content was high on the whole, and the difference in the average values was 16.984 t·hm-2, where the influence of human factors played an important role. In Cixian, Linzhang, Wuan and Handan counties, the increased value of soil organic carbon in the cultivated land exceeded 3.915 t·hm-2 due to the advocated application of straw and farmyard manure in these counties, but in Weixian, Jize and Quzhou counties, the soil organic carbon content was maintained or showed a slight decrease (-0.008–-1.727 t·hm-2). To increase carbon sequestration in soil, adoption of conservation tillage to increase soil organic carbon storage in the soil is recommended.
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Issue Date: 05 December 2008
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