农业工程学报2019，Vol.35Issue(19)：183-190,8.DOI:10.11975/j.issn.1002-6819.2019.19.022
滨海废弃盐田复垦区土壤盐分和有机质的空间变异特征
Spatial variability of soil salinity and organic matter in reclaimed area of abandoned salt pan in coast
摘要
Abstract
The southern area of Laizhou bay is located by the Bohai sea. There have been three seawater intrusion events in histo-ry, and a mass of high concentration saline brine has been buried in its subsurface aquifers. Large-scale exploitation of under-ground brine resources has been carried out since the 1970s. Brine baysalt has become a pillar industry of local economic develop-ment. In recent years, many salt pans become abandoned due to the exhaustion of regional shallow brine resources and the restric-tion of high cost and market factors of deep brine exploitation. In this context, some salt pans have been reclaimed based on the relevant government policies. Although a series of remediation measures that combining agriculture and engineering have been carried out on the reclaimed land of salt pans, the soil still contains a large amount of soluble salt on account of the influence of perennial baysalt process, moreover, the content of soil nutrients is also extremely low. The high soil salinity has always been the main limiting factor for the sustainable development of agriculture in the reclamation areas of abandoned salt fields. In this paper, soil sampling data of cotton growth period in four key nodes were used to study the spatial distribution characteristics of soil or-ganic matter and soil salinity at different depths in different periods, and to analyze the correlation between them. The two-dimen-sional spatial distribution map of soil organic matter content and the three-dimensional spatial distribution map of soil salinity in different periods were drawn. The results showed that the variation of soil salinity and organic matter content at different depths in different periods in the study area was large, among which the maximum variation of organic matter content reached 37.3 g/kg and the maximum variation of soil salinity reached 57.2 g/kg, the variation intensity of both soil salinity and organic matter con-tent was moderate. Soil salinity and organic matter content decreased with time change. The correlation between soil salinity and organic matter content in the soil layer of 0-30 cm was the highest, the range was from 0.25 to 0.38, but it did not reach the level of significant correlation. The correlation of soil salinity between different layers reached a significant or extremely significant de-gree. There was a moderate spatial autocorrelation between soil salinity and surface soil organic matter content. Kriging interpola-tion results showed that the surface soil organic matter content was distributed in a banded manner, the organic matter content in-creased gradually from west to east in seedling stage and flowering stage. The soil organic matter content in the flowering and boll period was the lowest in the northeast, and the highest in the harvest period was concentrated in the northwest and southeast. The three-dimensional spatial distribution of soil salinity was similar in different periods and different layers, and its spatial distri-bution characteristics were generally close. The high soil salinity area at seedling and flowering stage appeared in the southeast. The spatial distribution of soil salinity in flowering and flowering period was scattered and patchy. The results provide technical support for scientific improvement and rational utilization of saline soil and sustainable development of agriculture to the south-ern area of Laizhou Bay.关键词
土壤/盐/复垦/废弃盐田/土壤有机质/三维Key words
soils/salt/reclamation/abandoned salt pan/soil organic matter/three-dimensional分类
农业科技引用本文复制引用
刘文全,卢芳,徐兴永,付云霞,付腾飞,陈广泉..滨海废弃盐田复垦区土壤盐分和有机质的空间变异特征[J].农业工程学报,2019,35(19):183-190,8.基金项目
国家自然基金委-山东省联合基金项目(U1806212、U1606401) （U1806212、U1606401）
海洋公益性行业科研专项经费项目(2015418012-1) （2015418012-1）
