Since October last year (October 1, 2010 to February 9, 2011), the precipitation in most parts of North China, Huanghuai and Jianghuai is less than 50 mm, which is generally 5 to 80% less than the normal period, including southern Shandong. In southern Hebei, northeastern Henan, northern Anhui, and northern Jiangsu, there are less than 80%.
Distribution of meteorological drought in the winter wheat arid area in northern China on February 12, 2011
From February 3 to February 12, 2011, except for the eastern part of Huanghuai, precipitation occurred in most of the northern wheat areas. The precipitation in some parts of the southeastern part of Henan and northern Anhui reached 10-25 mm, which was beneficial to alleviate the drought. The area has been reduced from the previous tense and the degree has been reduced. The meteorological drought monitoring on February 12 showed that most of Henan and Hebei were light droughts. There were moderate to severe meteorological droughts in most of Shandong, southwestern Shanxi, northwestern and eastern Henan, northern Anhui, and northern Jiangsu, including eastern Henan and Jiangsu. There is a special drought in the north. The results of agricultural drought monitoring on February 12 showed that there were still mild droughts in southwestern Shanxi, south and northwestern Shandong, central Henan, northern Anhui and Other places, which was unfavorable for the growth of winter wheat without irrigation. There is no drought in most of the country's agricultural areas.
Soil moisture monitoring of 10, 20 and 50 cm in the winter wheat arid area of ​​northern China on February 12, 2011
The results of soil moisture monitoring on February 12 showed that in the unfrozen areas of the soil, the relative humidity of shallow soils in southern Gannan, south of Guanzhong, southern Hebei, western Henan, north central Shandong, northern Anhui, etc. was below 60%, Henan Local areas in the west and northern Anhui are less than 40%, and the grievances are poor; except for parts of northern Anhui, deep soils are better.
Forecast of precipitation in the winter wheat arid area in northern China from February 12 to 13, 2011
Yesterday to today, there was weak snowfall in the northern winter wheat area. On the 13th, on the 13th, there will be less than 2 mm of snowfall in southeastern Gansu, Shaanxi, Shanxi, Hebei, Shandong, western Henan, and northern Jiangsu. Among them, the northwestern part of the mountain has 2 to 3 mm, and the southern part of Hebei has 2 to 5 mm. . Compared with the precipitation process from the 9th to the 10th, the precipitation intensity is weak in this process, and it is mainly snowfall. The last precipitation in Henan and Anhui is basically no precipitation, and the last meteorological arid area in Shandong Province where there was no precipitation last time. Snowfall will occur but the amount will be small. Precipitation began in the daytime on the 12th, gradually expanding from west to east, and basically ended in the middle of the night after the 13th. Affected by cold air, from 12th to 14th, the temperature in North China, Huanghuai and other places will drop by 2~6°C, and the average daily temperature in the north of the middle and lower reaches of the Yangtze River will be below 0°C, which is not suitable for irrigation.
It is estimated that from the 14th to the 20th, most of the meteorological droughts in the northern winter wheat area have no precipitation, and the meteorological drought will continue . Affected by two cold air from 15th to 16th and 17th to 18th, there is a weak snowfall (rain) of about 1 mm in southeastern Shandong, northern Susong, southern Gansu and southwestern Shaanxi, among which southeastern Gansu There are 2 to 4 mm in parts of southwestern Shaanxi.
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