黑龙江省大豆产量与土壤湿度关系的研究

Relationship of soybean yield and soil moisture in Heilongjiang Province

利用黑龙江省1994～2007年土壤有效水分贮存量资料和同期各县市大豆产量,采用EOF和SVD分解、相关分析等方法讨论土壤湿度和大豆产量的关系。结果表明,黑龙江省6月上旬～7月上旬土壤湿度与大豆产量存在大尺度的空间相关特征,整体上大豆产量与此时土湿有较好的相关关系。该时期庆安、汤原、哈尔滨的土壤湿度可以作为大豆产量预报的一个参考因子;松嫩平原中东部和北部,以及哈尔滨、佳木斯附近是对土壤湿度变化最敏感的地区。

Based on the data of soybean yield and soil available water storage capacity from 17 standard meteorological stations in 1994-2007 in Heilongjiang Province, the relationship of soybean yield response with soil moisture was investigated in terms of empirical orthogonal function（EOF）, composite analysis, singular value decomposition （SVD）, and so on. The results showed that there were the large scale spatial correlative characteristics between the soybean yield and soil moisture from early June to early July. As a whole, the soybean yield was correlative to the soil moisture. Therefore, the soil moistures of Qingan, Tangyuan and Harbin could be considered as the reference factors in forecasting the soybean yield in Heilongjiang province. The soybean yield was sensitive to the changes of soil moisture. The most sensitive regions were Harbin, Jiamusi and the east-central and northern in the Songnen Plain.