The Occurrence, Sources and Spatial Characteristics of Soil Salt and Assessment of Soil Salinization Risk in Yanqi Basin, Northwest China

Abstract

In order to evaluate the soil salinization risk of the oases in arid land of northwest China, we chose a typical oasis-the Yanqi basin as the research area. Then, we collected soil samples from the area and made comprehensive assessment for soil salinization risk in this area. The result showed that: (1) In all soil samples, high variation was found for the amount of Ca2+ and K+, while the other soil salt properties had moderate levels of variation. (2) The land use types and the soil parent material had a significant influence on the amount of salt ions within the soil. (3) Principle component (PC) analysis determined that all the salt ion values, potential of hydrogen (pHs) and ECs fell into four PCs. Among them, PC1 (C1-, Na+, SO4 2-, EC, and pH) and PC2 (Ca2+, K+, Mg2+and total amount of salts) are considered to be mainly influenced by artificial sources, while PC3 and PC4 (CO3 - and HCO3 2-) are mainly influenced by natural sources. (4) From a geo-statistical point of view, it was ascertained that the pH and soil salt ions, such as Ca2+, Mg2+ and HCO3 -, had a strong spatial dependency. Meanwhile, Na+ and Cl- had only a weak spatial dependency in the soil. (5) Soil salinization indicators suggested that the entire area had a low risk of soil salinization, where the risk was mainly due to anthropogenic activities and climate variation. This study can be considered an early warning of soil salinization and alkalization in the Yanqi basin. It can also provide a reference for environmental protection policies and rational utilization of land resources in the arid region of Xinjiang, northwest China, as well as for other oases of arid regions in the world.

Using Modified Remote Sensing Imagery to Interpret Changes in Cultivated Land under Saline-Alkali Conditions

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Genetic Regulatory Networks for Salt-Alkali Stress in Gossypium hirsutum With Differing Morphological Characteristics

“…China is one of the largest cotton producing and cotton consuming countries in the world [1]. Currently, Xinjiang province is the largest cotton producing area in China [4]. Unfortunately, until now, although soil salt-alkalization could lead to crop growth damage and a decrease in crop yields, little attention has been paid on the molecular mechanisms of plant adaptation to alkaline stress [7].…”

Geoinformatics for Quantifying Salt Affected Soils in Gohana, Haryana Using Soil Techniques

“…Corwin and Lesch (2005) reported moderate to high variability in EC e in salinesodic soil. Zhaoyong et al, (2014) observed moderate variability in EC e while assessing the soil salinization risk in Yanqi basin, northwest China. Electrical conductivity is an important diagnostic parameter for evaluation of soil salinity.…”