Inhomogeneity Characteristics of Intra-annual Precipitation on the Loess Plateau During 1959-2008
Inhomogeneity Characteristics of Intra-annual Precipitation on the Loess Plateau During 1959-2008
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发表时间：
2012
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通讯作者：
Liu Xianfeng
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作者：
Liu Xianfeng
【摘要】：目的分析黄土高原年际降水量的不均匀特征,为当地植被建设和生态恢复、合理利用水资源、水土流失防治等提供参考。基于黄土高原51个气象站,利用降水集中度(PCD)和降水集中周期(PCP)分析近50年黄土高原年际降水量的不均匀特征及其变化趋势。 1959~2008年,并采用EOF、相关分析和趋势分析,结果如下:(1)黄土高原年降水量在50~850 mm之间,由东南向西北递减趋势。(2)黄土高原地区PCD在0.53~0.75之间,由东南向西北逐渐增大,PCP主要集中在黄土高原地区。 (3)在空间分布上,PCD主要呈现南北反转格局,且呈下降趋势,而PCP则由东西反转和西南及东部其他地区反转两个主要中心组成。(4)从变化趋势来看,黄土高原PCD平均趋势系数为0.005,PCP平均趋势系数为-0.21。PCD明显增加的地区主要分布在宁夏和五台山地区。山西,PCD明显下降的地区有山西阳泉和青海门源,而PCP在黄土高原大部分地区呈下降趋势。(5)PCD与年降水量呈现正相关,大部分已超过显着性水平0.05,而PCP与降水量相关性较小,超过显着性水平0.05的地方仅分布在山西兴县、陕西洛川和固原。宁夏.
This article aims to analyze the inhomogeneity characteristics of inter-annual precipitation on the Loess Plateau,and to provide reference for local vegetation construction and ecological recovery,rational use of water resources,and the prevention and control of soil and water loss.Precipitation concentration degree(PCD) and precipitation concentration period(PCP) were used to analyze the inhomogeneity characteristics of inter-annual precipitation and its trend in recent 50 years based on 51 meteorological stations of the Loess Plateau from 1959 to 2008,and EOF,correlation analysis and trend analysis were also employed.The results are shown as follows.(1) The annual precipitation of the Loess Plateau is between 50-850 mm,with a decreasing trend from southeast to northwest.(2) The PCD of the Loess Plateau region is between 0.53 and 0.75,which gradually increased from the southeast to the northwest,while the PCP is mainly observed in the mid-and late July.(3) In spatial distribution,PCD mainly manifests a north-south reverse pattern with a decreasing trend,while PCP consists of two main centers(east-west reverse and southwest and east-other areas reverse).(4) In terms of changing trend,the average trend coefficient of PCD on the Loess Plateau is 0.005,while that of PCP is-0.21.The regions with obviously increased PCD are mainly distributed in Ningxia and the Mount Wutai in Shanxi,and the areas with obviously decreased PCD include Yangquan of Shanxi and Menyuan of Qinghai,while PCP shows a decreasing trend in most parts of the Loess Plateau.(5) PCD shows a positive correlation with annual precipitation,most of which has passed the significant level 0.05,while PCP has a slight correlation with precipitation,the places that has passed the significant level 0.05 are only distributed in Xingxian of Shanxi,Luochuan of Shaanxi and Guyuan of Ningxia.