| Responses of soil moisture to climate change and relationship between soil moisture and soybean yield in Heilongjiang |
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| DOI：10.7606/j.issn.1000-7601.2011.01.06 |
| Key Words: soil moisture air temperature precipitation yield |
| Author Name | Affiliation | | JIANG Lixia | Heilongjiang Provincial Institute of Meteorological Sciences, Harbin, Heilongjiang 150030, China | | WANG Ping | Heilongjiang Provincial Institute of Meteorological Sciences, Harbin, Heilongjiang 150030, China | | LI Shuai | Heilongjiang Provincial Institute of Meteorological Sciences, Harbin, Heilongjiang 150030, China | | WANG Liangliang | Heilongjiang Provincial Institute of Meteorological Sciences, Harbin, Heilongjiang 150030, China | | QU Huihui | Heilongjiang Provincial Institute of Meteorological Sciences, Harbin, Heilongjiang 150030, China | | LU Jiajia | Heilongjiang Provincial Institute of Meteorological Sciences, Harbin, Heilongjiang 150030, China | | GONG Lijuan | Heilongjiang Provincial Institute of Meteorological Sciences, Harbin, Heilongjiang 150030, China | | WANG Qiujing | Heilongjiang Provincial Institute of Meteorological Sciences, Harbin, Heilongjiang 150030, China | | YAN Ping | Heilongjiang Provincial Institute of Meteorological Sciences, Harbin, Heilongjiang 150030, China |
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| Abstract: |
| Based on the 1980～2007 observation data of ten day soil moisture, monthly air temperature, and monthly precipitation during crop growth season (from May to September) from 32 agro-meteorological stations in Heilongjiang Province, the spatiotemporal variation of surface soil (0～30 cm) moisture and its responses to the air temperature and precipitation in the study area were analyzed by using statistical method, and the model for analyzing relationship between soybean yield and soil moisture was built by use of regression methods in the study area. The results showed that in Heilongjiang, the surface soil moisture during crop growth season in 1980～2007 had a decreasing trend, and tended to be aridified, especially in the west parts. Before the 1990s, the surface soil was relatively humid, but thereafter, the humidity kept decreasing, and partial dryness occurred. In the study period, the mean air temperature during crop growth season had a periodical increase before 1992, with a small fluctuation in a cycle of 6 years, but increased obviously after that. The precipitation during crop growth season had a larger inter annual variation, with a cycle of 4～5 years. The surface
soil moisture during crop growth season was significantly negatively correlated to air temperature and positively correlated to precipitation. Both air temperature and precipitation were the main climatic factors affecting the variation of surface soil moisture in Heilongjiang. Soybean yield was significantly correlated to the surface soil moisture in the study area, and partial dry or wet soil had a adverse influence on soybean yield. |
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