摘要
对1971—2000年陇东塬区气象资料分析表明,该区气温呈现出明显的线性上升趋势,且以冬季和春季增温为主。增温表现为平均气温、最高气温和最低气温同时上升。最高气温以季节转换时升幅最大,最低气温多数时间呈现上升趋势,且升温较最高气温显著。最高气温和最低气温均以12月上升最为显著。在气候变暖的趋势下,蒸发量显著增大,界限温度初日提前、终日推后,气温稳定通过0℃和10℃积温增加,无霜期延长,春秋土壤水分减少等。降水量、日照时数、太阳辐射和空气相对湿度等农业气象要素的整体变化不显著。认为气候变暖引起的多要素变化对农业的影响有利有弊,农业管理部门应根据当地气候变化特征,及时调整种植结构,优化种植模式,趋利避害,充分挖掘气候资源潜力,提高农业经济效益。
The analysis on the 1971 -2000 meteorological data showed that in the Loess Plateau of East Gansu, air temperature had an obvious increasing trend, especially in winter and spring, and the mean, maximum and minimum temperature increased simultaneously. The maximum temperature got its peak at the turn of seasons, while the minimum temperature always presented increasing trend, with larger increment than that of the maximum temperature. Both the minimum and maximum temperatures were increased obviously in December. Under the effects of climate warming, evaporation increased notably, and the beginning of boundary temperature was advanced while its ending was delayed. The accumulated temperature of ≥0 ℃ and ≥ 10 ℃ increased, frost-free period lengthened, and soil moisture in spring and autumn reduced. No significant variation was observed in precipitation, bright sunshine duration, solar radiation, and air relative humidity. The variation of these elements caused by climate warming had both advantages and disadvantages to agricultural production. To improve agricultural economic benefits, agricultural administrative departments should adjust and optimize farming systems in time, go after profits and avoid disadvantages, and make full use of climate resources, according to the variation characters of local climate.
出处
《生态学杂志》
CAS
CSCD
北大核心
2007年第3期344-347,共4页
Chinese Journal of Ecology
基金
科技部科研院所社会公益研究专项(2005DIB3J100)
中国气象局新技术推广项目(CMA7J2005M22)
国家自然科学基金资助项目(40205005)
关键词
黄土高原
农业气象要素
变化特征
Loess Plateau
agrometeorological element
variation character
