Variation character of grain yield per unit area in main grain-producing area of Northeast China
文献类型：SCI/SSCI论文
| 作者 | Cheng Y. Q. ; Zhang P. Y. ; Zhang H. M. |
| 发表日期 | 2007 |
| 关键词 | grain yield per unit area grey correlation analysis Northeast China main grain-producing area |
| 英文摘要 | Based on the surveys and the statistic data during 1980-2003, the variation character of grain yield per unit area in Northeast China and its main factors have been discussed by the methods of statistics and grey correlation analysis. The results show that: 1) the grain yield per unit area has been taking on an increasing trend in the recent 20 years. It increased from 2519.80kg/ha in 1980 to 4216.11kg/ha in 2003, with an increasing rate of 67.32%; 2) the variation of grain yield per unit area is considerably prominent and its range is also very great, with the maximal increase rate of 42.59% and maximal decrease rate of 21.13%, respectively, which are far above the whole Chinese average level; 3) the variation of main crops' yield per unit area is remarkable, which takes on the character that the yield of corn is much higher than that of soybean and rice; and 4) the grey correlation analysis shows that the most important factors impacting the variation of grain yield per unit area are the total power of agricultural machinery, the consumption of chemical fertilizer and effective irrigated area. However, the influence of natural disaster and income level should not be ignored. Effective ways to improve grain yield per unit area are to construct farmland improvement groundwork, reclaim the middle- and low-yield farmland, etc. |
| 出处 | Chinese Geographical Science |
| 卷 | 17 |
| 期 | 2 |
| 页 | 110-116 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 1002-0063 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/24188]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Cheng Y. Q.,Zhang P. Y.,Zhang H. M.. Variation character of grain yield per unit area in main grain-producing area of Northeast China. 2007. |
入库方式： OAI收割
来源：地理科学与资源研究所
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