现代黄河三角洲30cm土壤电导率与土壤水吸力关系特征初探

对在2005年4月7日—11月23日期间获得的布设于现代黄河三角洲的18个长期野外水盐观测井的30cm土层的土壤电导率和土壤水吸力数据进行研究,结果表明:整个观测期内30cm土层的土壤电导率与土壤水吸力相关性不显著;2005年4月7日—6月6日期间(即植物生长初期、农作物播种期),仅DZ05、DZ16和DZ17号观测井土壤电导率与土壤水吸力呈显著正线性相关关系,DZ08、DZ13和DZ15号观测井土壤电导率与土壤水吸力可用曲线方程拟合;2005年9月30日—11月23日期间(植物生长末期),DZ01、DZ02、DZ04、DZ06、DZ10、DZ12、DZ14、DZ15和DZ18号观测井土壤电导率与土壤水吸力可用曲线方程拟合,DZ07和DZ16号观测井土壤电导率与土壤水吸力呈显著负相关,DZ03号观测井土壤电导率与土壤水吸力呈显著正相关。由此可见植物生长末期是现代黄河三角洲研究野外实测土壤电导率与土壤水吸力的最佳时期。

Preliminary Study on the Relationships between Soil Electrical Conductivity and Soil Suction in Modern Yellow River Delta

Based on data acquired from April 7 to November 23,2005 in Modern Yellow River Delta,preliminary study on the relationships between soil electrical conductivity and soil suction of 30cm depth were carried out with eighteen field observation wells for soil moisture and soil salt monitoring.The results indicated that the correlation between soil electrical conductivity and soil suction of 30cm depth was not statistically significant from April 7 to November 23,2005.During the period of April 7 to June 6,2005(i.e.,the initial stages of plant growth,seedtime of crops),only the correlation between soil electrical conductivity and soil suction of 30cm depth at DZ05,DZ16 and DZ17 were statistically significant,positive linear correlation,and the correlation between soil electrical conductivity and soil suction of 30cm depth at DZ08,DZ13 and DZ15 could be modeled by curve estimation.During the period of September 30 to November 23,2005(i.e.,the final phase of plant growth),the correlation between soil electrical conductivity and soil suction of 30cm depth at DZ01,DZ02,DZ04,DZ06,DZ10,DZ12,DZ14,DZ15 and DZ18 could be modeled by curve estimation,and the correlation between soil electrical conductivity and soil suction of 30cm depth at DZ07,DZ16 were statistically significant,negative linear correlation,and the correlation between soil electrical conductivity and soil suction of 30cm depth at DZ03 was statistically significant,positive linear correlation.Thus it could be seen that the final phase of plant growth was the best period for studying the relationships between soil electrical conductivity and soil suction collected from field on-the-spot observation in Modern Yellow River Delta.