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| DOI：doi：10.13522/j.cnki.ggps.20190026 |
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| Soil Salt Distribution and the Factors Affect it in Ogan Kucha River Oasis |
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LI Yanju, DING Jianli, Mireguli Ainiwaer
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1. College of Resource and Environment Science, Xingjiang University, Urumqi 830046, China; 2. Key Laboratory of Wisdom City and Environmental Modeling Department of Education, Urumqi 830046, China; 3. Ministry of Education Key Laboratory of Qasis Ecology, Xingjiang University, Urumqi 830046, China
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| Abstract: |
| 【Objective】This paper studied the spatiotemporal dynamics of soil salt in the Ogan Kucha River oasis in attempts to unravel its underlying mechanisms and helping ameliorate soil salinization that affect agricultural production in this region. 【Method】 The studied area was a moderate salinized field in Ogan Kucha River Oasis, from which we measured salt content in 10~20, 20~40 and 40~60 cm soil respectively. Using decision tree, Kriging interpolation and grey relation analysis, we analyzed the role of elevation, vegetation coverage, depth of groundwater table, topographic wetness index (TWI) and groundwater salinity in formation of soil salinization.【Result】The top 0~10 cm soil was heavily salinized while the 10~60 cm soil as moderately salinized. The EC1:5 varied erratically over space, affected anthropologically by factors such as irrigation. The surface soil in the oasis was less salt-affected, and light-moderate salinization was found in 10~60 cm soil in the east part of the oasis. Soil salinity in sub-soil was higher than that in the top soil, indicating a risk of potential salinization. The oasis-desert ecotone in the periphery of tilled area was salinized and the salinity level decreased with depth. The EC1:5 in the top 0~10 cm soil was correlated to elevation, vegetation coverage, depth of groundwater table, TWI and groundwater salinity, ranked in groundwater salinity>TWI>elevation>vegetation coverage>groundwater level. For EC1:5 in 10~40 cm soil, and impact of these factors was ranked in groundwater salinity>elevation>TWI > vegetation coverage>groundwater level. The impact of these factors on EC1:5 in 40~60 cm was groundwater salinity> elevation>TWI>groundwater level>vegetation coverage. 【Conclusion】Soil salinization in Ogan Kucha River Oasis is mainly distributed in the oasis-desert ecotone and groundwater salinity is the primary cause of the soil salinization. |
| Key words: soil salinity; oasis; decision tree; Kriging; grey relation analysis |
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