| Combined effects of groundwater depth and soil salinization on Enhanced Vegetation Index in Hetao irrigation area |
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| DOI：10.7606/j.issn.1000-7601.2023.03.18 |
| Key Words: groundwater depth soil salinization EVI crop growth Hetao irrigation area |
| Author Name | Affiliation | | MA Xiaoming | School of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China | | LI Ruiping | School of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China | | LI Xinlei | School of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China | | PAN Hongmei | Shahao Canal Test Station, Jiefangzha Sub\|center, Water Conservancy Development Center of Hetao Irrigation District, Bayannur, Inner Mongolia 015000, China | | WANG Xiangdong | Inner Mongolia Hetao Irrigation District Water Conservancy Development Center Jiefangzha Sub\|center, Bayannur, Inner Mongolia 015000, China | | LI Yumin | Inner Mongolia Hetao Irrigation District Water Conservancy Development Center Jiefangzha Sub\|center, Bayannur, Inner Mongolia 015000, China |
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| Abstract: |
| To study the combined effects of groundwater depth and soil salinity on crop growth in arid and semi\|arid regions, the main crops of wheat, maize and sunflower in Jiefangzha irrigation area of Hetao irrigation district were taken as the research objects in this study. The enhanced vegetation index was extracted by using remote sensing images. The data of soil salinity and groundwater depth in 0~20 cm and 0~40 cm soil layers were obtained by field experiments. The dual\|factor coordinate system was constructed to determine the combined response of groundwater depth and soil salinity to vegetation index. The soil salinity and groundwater depth range suitable for crop growth were obtained by statistics. The results showed that: (1) The most suitable ranges of groundwater depth for wheat growth in May and June were 0.99~2.01 m and 1.03~1.54 m, respectively, and the corresponding soil salinities were 1.00~1.30 g·kg-1 and 1.53~2.02 g·kg-1, respectively. （2) The most suitable groundwater depths for maize growth in June, July and August were 1.56~1.80, 1.82~2.00 m and 1.43 ~2.31 m, respectively, and the corresponding soil salinities were 1.24~1.68, 1.25~1.55, 0.98~1.40 g·kg-1, respectively. (3) The most suitable ranges of groundwater depth for sunflower growth in July and August were 0.75~1.70 m and 1.20~1.61 m, respectively. The corresponding soil salinities were 1.46~1.70 g·kg-1 and 5.55~5.84 g·kg-1, respectively. |
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