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| Effects of removal lands from cultivation to afforestation on grain production of Hebei Province |
| Shi Lili1,Gu Jiancai1,He Shujuan2,Feng Shasha3,Pang Haihui4,ChenYu1 |
| 1.Agricultural University of Hebei,071000,Baoding,Hebei;2.Institution of Supervision and Inspection of Hebei,050010,Shijiazhuang;3.Department of Horticulture,Hebei North University,075100,Zhangjiakou,Hebei;4.MountainousEconomy Technical Development Office of Hebei,050021,Shijiazhuang:China |
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Abstract Effects of removal lands from cultivation to afforestation on grain production are analyzed by means of qualitative and quantitative methods.The module of GM(1,1) is used to forecast the trend of population development of Hebei in the next eight years and the gray correlation method is applied to study factors of the total grain yield.The results show that removal lands from cultivation to afforestation leads to the reduction of cropland areas in the whole province and improves the environment of grain production at the same time which increases the grain yield per unit area.So the total grain yield is increased.The increasing population brings the large stress on cropland and grain resource. Grain yield per unit area and irrigation are the most important factors among all influencing factors and the application of chemical fertilizer is the secondary factor.
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Received: 21 December 2008
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