| Spatial-temporal variability of soil salt content before and after irrigation in the Yellow River Delta |
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| DOI：10.7606/j.issn.1000-7601.2013.03.31 |
| Key Words: soil salt irrigation spatial-temporal variability semi-variance field scale saline-alkali soil |
| Author Name | Affiliation | | WU Xiangdong | Anhui Huaihe Water Resources Technology Co.,Ltd.、Bengbu, Anhui 233001, China | | CHEN Xiaobing | Yantai lnstitute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong 264003, China | | LV Zhenzhen | Institute of Soil Science, Chinese Academy of Seiences, Nanjing, Jiangsu 210008, China | | GUO Jianqing | Chang’an University, Xi’an, Shaanxi 710064, China | | YU Junbao | Yantai lnstitute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong 264003, China |
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| Abstract: |
| In attempt to study spatial and temporal variability of soil salt content before and after irrigation, the descriptive
statistics and geostatistics were used to quantitatively analyze soil salt content of field-scale in vertical and horizontal directions in the Yellow River Delta. The result showed that soil salt content was gathered in 0~10 cm layer and 40~60 cm layer before the irrigation, and gathered in 40~60 cm layer after the irrigation. Irrigation reduced salinity of 0~10 cm and 10~20 cm soil layer and gained better desalination. Except soil salt content of 0~10 cm layer had a weak spatial correlation after irrigation, all other layers of soil showed a strong spatial correlation. Compared salt content of soil before irrigation with after irrigation, salt content of 40~60 cm layer was signifieantly reduced after irrigation, soil salinity contour intensity was weakened, and
spatial distribution trend clearly tumed to flat. Before irrigation, high soil salinities of all soil layers were detected in the northem part of the study area, while low soil salinities were detected in the northwest comer; After irrigation, except high soil salinity of 0~10 cm layer was detected in north-central area, high
soil salinities of the rest layers(10~20 cm, 20~40 cm and 40~60 cm) were discovered in south-central or central area. Low soil salinity of each layer of soil showed same distribution pattemn, and they were mostly observed in the northern part of the experimental field. |
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