Spatial Distribution of Soil Physical and Chemical Properties and Influencing Factors in Changli Gold Coast National Nature Reserve

Abstract

【Objective】The study was carried out to explore the spatial distribution characteristics of soil physical and chemical properties in Changli Gold Coast National Nature Reserve, with an aim to provide scientific references for establishing a virtuous cycle of vegetation ecosystem in the reserve.【Method】Fifty-seven sampling sites were determined by 1 000 m×1 000 m grid sampling method, and 0-10 cm and 10-20 cm soil samples were collected for physical and chemical properties determination. The kriging interpolation method was used for spatial mapping, and the main influencing factors were discussed according to correlation analysis and variance analysis.【Result】The soil physical and chemical properties of the reserve showed obvious spatial heterogeneity in the horizontal direction, and the farther away from the sea, the higher value of some physical and chemical property indexes. The soil texture was mainly divided into four categories: sand, loamy sand, sandy loam and silty loam, of which sand accounted for about 70%, with the sand content reaching 85%-100%. The western Qilihai experimental area was salinized with the total salt quantity of 5.22 g/kg. The coastal area was mainly non-salinized and mildly salinized. There were significant correlations among the indexes, soil bulk density was negatively correlated with water content and nutrient indexes. In addition to bulk density, soil water content was significantly positively correlated with the other six indexes. The four nutrient indexes were positively correlated with each other, and the pH value was significantly positively correlated with available phosphorus, available potassium and total salt quantity. In addition, the distribution pattern of soil physical and chemical properties was affected by factors such as the distance from the coastline, land use type and soil type. The distance from the soastline played a significant role. The water and nutrients content of farm land were significantly higher than those of wood land, grassland and unused land. Compared with tidal soil and coastal salt soil, coastal aeolian sand soil had higher soil bulk density, lower water content, organic matter content, total salt quantity and pH value.【Conclusion】In the western Qilihai experimental area, saline-alkali tolerant plants should be selected as the main species, and drought-tolerant and wind-resistant tolerant seedlings should be selected in the land buffer area, the southern land core area and the Jinshawan experimental area.

Keywords

• soil physical and chemical property
• spatial heterogeneity
• nature reserve
• kriging interpolation method
• adapted species
• changli gold coast