| Precipitation changes in recent 50 years and evaluation for water suitability of peanut in semi arid area of northwest Liaoning Province |
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| DOI：10.7606/j.issn.1000-7601.2013.05.002 |
| Key Words: semi arid area precipitation change peanut evaluation of suitability |
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| Abstract: |
| The expansion and shift of advantageous production region of peanut in Liaoning Province are restrained by many factors, in which the influence of precipitation is most considerable. Based on the precipitation changes in Fuxin in recent 50 years, the precipitation patterns were analyzed by
using guaranteed rate and variability of precipitation, soil moisture evaporation and soil water budget, and the water suitability of peanut was evaluated in northwest Liaoning. It is shown that the frequent draught is still the basic climatic characteristic in northwest Liaoning, and there is a trend that it will continue to worsen. During April and May, the guaranteed rate of precipitation is low, and the deficiency of soil moisture is as high as 100 mm. The variability of precipitation in winter and spring is more than 110%, and the probability of spring draught is much high, which is unbeneficial to the seeding of peanut. From the viewpoint of whole growth period, the precipitation can basically meet the water requirement of peanut. The relation between biomass yield (y) and precipitation (x) follows the equation y=a+bx, and the correlation coefficient r=0.999. In order to realize regional sustainable development of peanut production, attentions should paid to three technical difficulties: seeding at drought avoidance, ecological resistance of wind erosion, and avoidance of competition for land with grain crops. |
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