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| The spatiotemporal variation of soil organic matter and its influencing factors in the Changbai MountainLiaodong black soil region |
| Received:February 15, 2024 |
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| KeyWord:soil organic matter;northeast black soil region;spatiotemporal variation;driving factors |
| Author Name | Affiliation | E-mail | | HE Mengni | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China | | | SUN Jiguang | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China | | | XU Yingde | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China | yingdexu@126.com,yingdexu@syau.edu.cn | | WANG Jingkuan | College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China | |
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| Abstract: |
| Clarifying the spatiotemporal changes of soil organic matter（SOM）in cultivated land at a regional scale is of great significance to promoting the sustainable development of agricultural ecosystems. The geostatistics and GIS methods were used to explore the spatiotemporal variation characteristics and influencing factors of SOM in the Changbai Mountain-Liaodong black soil region since the second national soil census. The results showed that：the average SOM content in the Changbai Mountain-Liaodong black soil region was 31.75 g·kg-1 and 27.07 g·kg-1 in 1980 and 2015, respectively, with an average decrease of 4.68 g·kg-1. The areas where the SOM content decreased more significantly are mainly distributed in eastern Liaoning, central Jilin, and central and southern Heilongjiang. The optimal theoretical model for the SOM semivariogram function is the linear model. The mapping results showed significant spatial heterogeneity in SOM content in the Changbai Mountain-Liaodong black soil region, exhibiting a trend of gradual increase from southwest to northeast. The central and northern parts of the region have relatively high SOM content（most of them were exceeding 20 g ·kg-1）. SOM content was influenced by elevation, annual precipitation, soil type, and soil parent material. Specifically, Soils with higher SOM background, lower elevations, and lower accumulated temperature areas experienced greater decreases in SOM content. Overall, the SOM content level in the study area was at a medium level, and the SOM content in different areas was quite different. In future agricultural production, it is necessary to carry out differentiated fertilization management in different areas. |
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