Differences in Spatial Variation of Soil Chemistry Between Natural and Anthropogenic Soils

Abstract

The Agricultural Land Remodeling Project was launched for agricultural fields with potential risk of flooding which were placed in low-lying area as a part of agricultural sectors of the National 4 River Project. It induced of the reclaimed agricultural fields on a national scale. The arable lands reestablished by reclamation have caused several big problems such as destruction of soil physicochemical properties, and thus the techniques to solve disadvantages were urgently required. In this study, we collected experimental samples from top soils in three agricultural areas, one from conventional agricultural fields (Hwasun, Jeollanam-do) and the others from reclaimed (remodelled) agricultural fields (Naju, Jeollanam-do and Gumi, Gyeongsangbuk-do), The soil chemistry data were analyzed using statistic tools such as semi-variance and kriging, and differences between natural and reconstructed soils were examined. The score, R (Ao) which indicates a dependence distance between each chemical element, was as follows; 21.8~43.5 (Conventional, Hwasoon), 4.4~70.6 (Remodelled, Naju) and 5.3~43.6 (Remodelled, Gumi). These results suggested that chemical properties of the reclaimed agricultural fields had a huge variation. Moreover, the result of kiriging maps also represented a ununiform pattern in the reclaimed lands. As a result of this study, it is strongly required to build up the soil type-specific management techniques for the reclaimed agricultural lands.

Changes in Reconstructed Soil Physicochemical Properties in an Opencast Mine Dump in the Loess Plateau Area of China

“…As essential indicators of soil quality, the properties of constructed soils become more heterogeneous due to the random dumping of soil during overburden placement and previous soil reclamation [ 13 , 19 ], making the physicochemical properties of reconstructed soils different from those of natural soils. Many scholars have studied the spatial distribution characteristics of soil physicochemical properties, and have revealed the spatial variation rules of soil physicochemical properties on reclaimed land [ 20 , 21 , 22 , 23 , 24 , 25 ]. The values of physicochemical properties of reconstructed soil are higher than those of natural soil [ 26 ], and different soil physicochemical properties are significantly correlated [ 12 ].…”