Abstract
As an important area of reserve land resources, the Yellow River Delta is faced with the problem of soil salinization. Grasping the characteristics of soil salinity as well as its spatial variation patterns is an important foundation of prevention, control and utilization of saline soil. This study selected Kenli County of the Yellow River Delta, obtained soil salinity data through field survey and lab experiment, and used statistical, GIS interpolation and buffer analysis methods to analyze the characteristics of soil salinity and its spatial variation patterns. Our results showed that the general soil salinity in the study area was mainly moderate and there was a significant positive correlation between different soil layers of 0 - 15 cm, 15 - 30 cm and 30 - 45 cm and soil salinity increased with the increase of soil depth. The areas with high soil salinity in each soil layer mainly distributed in the east near the Bo Sea in the county, while the areas with lower soil salinity mainly distributed in the southwest, centre and the two sides of the Yellow River in the northeast. Soil salinity showed a trend of decrease with the increase in distance to the Bo Sea, while stretching from the Yellow River, it showed increase tendency with the increase in distance to the Yellow River. The order from high soil salinity to low of different vegetation types was naked land → suaeda glauca → tamarix → vervain → reed → couch grass → paddy → cotton → winter wheat → maize; the order for different geomorphic types was depression → slightly sloping ground → slow hillock → high flood land. This study preliminary delineated the characteristics of soil salinity as well as its spatial variation patterns in the study area, and provided scientific basis for soil resource sustainable utilization in the Yellow River Delta.
Highlights
At present, human are facing severe population, resources and environment crisis; saline-alkaline degradation of soil and land resources is still very serious
According to related soil salinization classification standard [17], soil salinity can be divided into 5 levels in Kenli county: 0.6% as saline soil
Means are greater than medians, indicating that soil salinity is a left excursion distribution; the median is suitable for describing the overall soil salinity level in Kenli County
Summary
Human are facing severe population, resources and environment crisis; saline-alkaline degradation of soil and land resources is still very serious. According to the incomplete statistics of UNESCO and FAO, the saline-alkaline land area is 99.13 million hectares in China, and they are mainly distributed in low terrain, high underwater table, semi-humid, semi-arid and arid inland or coastal areas. The Yellow River Delta is one of the fastest epeirogenic estuary deltas of China or even the world. It has rich natural resources and is the important reserve land resources in China. Influenced by rivers, land, sea and other dynamical systems, the saline soil of the Yellow River Delta area is large with wide distribution, the land utilization changes frequently and the ecological environment is fragile. The study of saline soil will be of great significant to the improved utilization
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