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| Development of gully erosion in Northeast China and its effects on the national food security |
| Wang Nianzhong1， Shen Bo2 |
| 1. Soil and Water Conservation Monitoring Center, Songliao Water Resources Commission, Ministry of Water Resources；2.Division of Soil and Water Conservation, Songliao Water Resources Commission, Ministry of Water Resources：130021，Changchun，China |
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Abstract By analyzing the gullies development in number, length, density, area (mainly referring to the lost cultivated land) and their distribution in river basins of typical black land zone from 1965 to 2005, we studied the effect of gully erosion on food security, Northeast China. Results show that: 1) From 1965 to 2005, gully area, gully number and total length of gully increased by 85.27km2, 13168, and 6183.70km, respectively. Gully density increased from 0.034km/km2 to 0.193km/km2 during the 40years. The gully number, area and density increased rapidly. 2) Different land use led to different gully development rate. For cultivated land, gully area, gully number, length of gully and gully density increased by 81.83km2, 12825, 5981.23km and 0.271km/km2 respectively; for woodland and other land use, they increased by 3.44km2, 343, 202.47km and 0.02km/km2 respectively. 3) A great proportion of gully occurred in the cultivated land in typical black land zone, with area for 96% and number for 97.4%. Gully mainly occurred on cultivated land in typical black soil zone, Northeast China, which would have adverse effects on the national food security.
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Received: 22 March 2011
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