Limits...
Analysis of Precipitation Characteristics during 1957-2012 in the Semi-Arid Loess Plateau, China.

Zhao W, Yu X, Ma H, Zhu Q, Zhang Y, Qin W, Ai N, Wang Y - PLoS ONE (2015)

Bottom Line: Based on precipitation data from 7 synoptic stations in the study area over the period 1957-2012, the trends of precipitation and standardized precipitation index (SPI) were analyzed by using linear regression, Mann-Kendall, and Spearman's Rho tests at the 5% significance level.The results show that (1) the precipitation fluctuation of monthly precipitation was intense (coefficients of variation> 100%), and the drier years were recorded as 1965 and 1995 at all stations. (2) The significant change trend of different stations varied on different time scales: the Changwu station had a significant decreasing trend in April (-0.488 mm/year) and November (-0.249 mm/year), while Luochuan station was in April (-0.457 mm/year); Changwu station displayed a significant increasing trends in winter (0.220 mm/year) and a significant decreasing trends in spring (-0.770 mm/year).The significant decreasing trends in annual precipitation were detected at the Suide (-2.034 mm/year) and Yan'an (-2.129 mm/year) stations. (3) The SPI-12 series analysis suggests that the drought degree of Yulin and Changwu was the lowest and that of Hengshan was the highest among the 7 synoptic stations.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of tourism and resources environment in colleges and universities of Shandong Province, Taishan University, Taian, Shandong, China; Beijing Forestry University, Forestry Ecological Engineering Research Center, Ministry of Education, Beijing, China.

ABSTRACT
Precipitation is the only water supply and most important factor affecting vegetation growth on the slopes of semi-arid Loess Plateau of China. Based on precipitation data from 7 synoptic stations in the study area over the period 1957-2012, the trends of precipitation and standardized precipitation index (SPI) were analyzed by using linear regression, Mann-Kendall, and Spearman's Rho tests at the 5% significance level. The results show that (1) the precipitation fluctuation of monthly precipitation was intense (coefficients of variation> 100%), and the drier years were recorded as 1965 and 1995 at all stations. (2) The significant change trend of different stations varied on different time scales: the Changwu station had a significant decreasing trend in April (-0.488 mm/year) and November (-0.249 mm/year), while Luochuan station was in April (-0.457 mm/year); Changwu station displayed a significant increasing trends in winter (0.220 mm/year) and a significant decreasing trends in spring (-0.770 mm/year). The significant decreasing trends in annual precipitation were detected at the Suide (-2.034 mm/year) and Yan'an (-2.129 mm/year) stations. (3) The SPI-12 series analysis suggests that the drought degree of Yulin and Changwu was the lowest and that of Hengshan was the highest among the 7 synoptic stations.

No MeSH data available.


Related in: MedlinePlus

Map of the Spatial distribution of the 7 synoptic stations in the semi-arid region of Northern Shaanxi.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4631353&req=5

pone.0141662.g001: Map of the Spatial distribution of the 7 synoptic stations in the semi-arid region of Northern Shaanxi.

Mentions: Monthly precipitation data were collected from 7 synoptic stations (from north to south: Yulin, Hengshan, Suide, Wuqi, Yan’an, Luochuan, and Changwu) from Shaanxi Province, China (Fig 1) during 1957–2012. These data were obtained from the China Meteorological Data Sharing Service System (http://cdc.cma.gov.cn/cdc_en/home.dd). The distribution of the 7 synoptic stations is homogeneous from north to south in the northern Shaanxi Province. A detailed description of the selected synoptic stations is given in Table 1.


Analysis of Precipitation Characteristics during 1957-2012 in the Semi-Arid Loess Plateau, China.

Zhao W, Yu X, Ma H, Zhu Q, Zhang Y, Qin W, Ai N, Wang Y - PLoS ONE (2015)

Map of the Spatial distribution of the 7 synoptic stations in the semi-arid region of Northern Shaanxi.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4631353&req=5

pone.0141662.g001: Map of the Spatial distribution of the 7 synoptic stations in the semi-arid region of Northern Shaanxi.
Mentions: Monthly precipitation data were collected from 7 synoptic stations (from north to south: Yulin, Hengshan, Suide, Wuqi, Yan’an, Luochuan, and Changwu) from Shaanxi Province, China (Fig 1) during 1957–2012. These data were obtained from the China Meteorological Data Sharing Service System (http://cdc.cma.gov.cn/cdc_en/home.dd). The distribution of the 7 synoptic stations is homogeneous from north to south in the northern Shaanxi Province. A detailed description of the selected synoptic stations is given in Table 1.

Bottom Line: Based on precipitation data from 7 synoptic stations in the study area over the period 1957-2012, the trends of precipitation and standardized precipitation index (SPI) were analyzed by using linear regression, Mann-Kendall, and Spearman's Rho tests at the 5% significance level.The results show that (1) the precipitation fluctuation of monthly precipitation was intense (coefficients of variation> 100%), and the drier years were recorded as 1965 and 1995 at all stations. (2) The significant change trend of different stations varied on different time scales: the Changwu station had a significant decreasing trend in April (-0.488 mm/year) and November (-0.249 mm/year), while Luochuan station was in April (-0.457 mm/year); Changwu station displayed a significant increasing trends in winter (0.220 mm/year) and a significant decreasing trends in spring (-0.770 mm/year).The significant decreasing trends in annual precipitation were detected at the Suide (-2.034 mm/year) and Yan'an (-2.129 mm/year) stations. (3) The SPI-12 series analysis suggests that the drought degree of Yulin and Changwu was the lowest and that of Hengshan was the highest among the 7 synoptic stations.

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of tourism and resources environment in colleges and universities of Shandong Province, Taishan University, Taian, Shandong, China; Beijing Forestry University, Forestry Ecological Engineering Research Center, Ministry of Education, Beijing, China.

ABSTRACT
Precipitation is the only water supply and most important factor affecting vegetation growth on the slopes of semi-arid Loess Plateau of China. Based on precipitation data from 7 synoptic stations in the study area over the period 1957-2012, the trends of precipitation and standardized precipitation index (SPI) were analyzed by using linear regression, Mann-Kendall, and Spearman's Rho tests at the 5% significance level. The results show that (1) the precipitation fluctuation of monthly precipitation was intense (coefficients of variation> 100%), and the drier years were recorded as 1965 and 1995 at all stations. (2) The significant change trend of different stations varied on different time scales: the Changwu station had a significant decreasing trend in April (-0.488 mm/year) and November (-0.249 mm/year), while Luochuan station was in April (-0.457 mm/year); Changwu station displayed a significant increasing trends in winter (0.220 mm/year) and a significant decreasing trends in spring (-0.770 mm/year). The significant decreasing trends in annual precipitation were detected at the Suide (-2.034 mm/year) and Yan'an (-2.129 mm/year) stations. (3) The SPI-12 series analysis suggests that the drought degree of Yulin and Changwu was the lowest and that of Hengshan was the highest among the 7 synoptic stations.

No MeSH data available.


Related in: MedlinePlus