| Variations of summer and autumn grain crops' climatic suitability in the areas east of Yellow River in Gansu in recent 40 years |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2011.05.45 |
| Key Words: east of the Yellow River in Gansu 40a summer and autumn grain crops climate suitability degree variation |
| Author Name | Affiliation | | PU Jinyong | Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province, Key and Open Laboratory of Arid Change and Disaster Reduction of CMA, Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020, China
Agrometeorological Experimental Station of Tianshui, Tianshui, Gansu 741020, China | | YAO Xiaoying | Tianshui Meteorological Bureau, Tianshui, Gansu 741000, China | | YAO Ruxin | Tianshui Shimaping Middle School, Tianshui, Gansu 741020, China |
|
| Hits: 269 |
| Download times: 185 |
| Abstract: |
| Based on the phonological data of main summer and autumn grain crops in Tianshui and Xifeng Agrometeorological Experimental Stations and Pingling, Lixian and Chengxian Agrometeorological Observation Stations located in the areas east of the Yellow River in Gansu, the model for assessing climate suitability was set up. The variations of climatic suitability degrees in
recent 40 years were analyzed with the model and climate suitability degrees of summer and autumn grain crops were compared and demonstrated. The result showed that the suitability degree of sunshine was relatively higher and that of temper
ature was the next in the whole growth period of winter wheat; but for maize the suitability degree of temperature was higher, and that of sunshine was the next in the whole growth period. The suitability degree of water was low for both winter wheat and maize that means the water was the restricting factor for production of both summer and autumn crops. The trends of the suitability degree of sunshine for both winter wheat and maize turned rising and the trends of that of temperature for winter wheat turned rising but for maize turned falling in recent years. The suitability degree of water for winter wheat and maize decreased by 0.013 and 0.069 every ten years respectively and water stress for both summer and autumn crops increased year by year. The synthetic climate suitability degree for maize was greater than that for wheat in most years. The most remarkable difference of synthetic climate suitability degree for summer and autumn crops appeared in late 1980s in which the value of synthesis climate suitability degree of maize minus that of wheat increased by 0.068 from 1971～1987 and decreased by 0.047 from 1987～2008 every ten years. It indicated that the superiority of autumn grain crops' production was dropping off compared with that of summer gain crops. We suppose that this trend should be paid more attention in adjusting the pla
nting design. |
|
|
|