| Change characteristics of shallow soil humidity and its impact climate factors in Liaoning spring sowing stage |
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| DOI：10.7606/j.issn.1000-7601.2018.05.39 |
| Key Words: soil humidity change characteristics climate influencing factor Liaoning Province |
| Author Name | Affiliation | | HU Chun-li | Liaoning Institute of Meteorological Science, Shenyang, Liaoning 110166, China | | LI Ji | Liaoning Institute of Meteorological Science, Shenyang, Liaoning 110166, China | | JIAO Min | Liaoning Institute of Meteorological Science, Shenyang, Liaoning 110166, China | | WANG Ting | Liaoning Institute of Meteorological Science, Shenyang, Liaoning 110166, China | | LI Yu-hong | Liaoning Institute of Meteorological Science, Shenyang, Liaoning 110166, China | | LIN Rong | Shenyang Regional Climate Centre,Shenyang, Liaoning 110016, China | | WANG Yang | Liaoning Institute of Meteorological Science, Shenyang, Liaoning 110166, China |
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| Abstract: |
| Based on data of relative humidity, precipitation and temperature in the depth 0~20 cm of 19 agricultural weather stations in Liaoning Province from 1981 to 2015, the spatial distribution, long-term changes, the catastrophe features, the periodic characteristics of soil relative humidity were analyzed. The results showed that there was a significant change in soil moisture in the past 35 years. Soil moisture in Liaoxi area decreased (the degree of drought) , soil moisture in Liaodong area increased and soil moisture fluctuated yearly.There was no obvious long-term trend and mainly experienced a smooth-partial dry-partial wet three periods. There was no obvious point of change in April and May. There were 4~7 a and quasi-2a cycle respectively.The stability of soil moisture enhanced after 2000 . The frequency of soil abnormal dry and extremely wet events increased significantly, especially in the most obvious performance in arid areas of western Liaoning.Soil moisture in April related to autumn precipitation stored in winter frozen soil.Next spring soil melt back to the pulp increased soil moisture. Soil moisture in May related significantly (α=0.01) to the precipitation and temperature in the same period. |
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