| 何孟霓,孙继光,徐英德,汪景宽.长白山-辽东黑土区耕地土壤有机质时空变异及影响因素[J].农业环境科学学报,2025,44(2):452-460. |
| 长白山-辽东黑土区耕地土壤有机质时空变异及影响因素 |
| The spatiotemporal variation of soil organic matter and its influencing factors in the Changbai MountainLiaodong black soil region |
| 投稿时间：2024-02-15 |
| DOI：10.11654/jaes.2024-0153 |
| 中文关键词: 土壤有机质 东北黑土区 时空变化 驱动因素 |
| 英文关键词: soil organic matter northeast black soil region spatiotemporal variation driving factors |
| 基金项目:国家重点研发计划项目（2021YFD1500202，2021YFD1500205） |
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| 中文摘要: |
| 明晰区域尺度耕地土壤有机质的时空动态变化对促进农田生态系统绿色可持续发展具有重要意义。本研究以长白山-辽东黑土区为研究对象，利用地统计学与GIS等技术相结合的方法，探究自第二次全国土壤普查以来该地区耕地土壤有机质时空变异特征及其影响因素。结果表明：研究区“二普”时期和2015年耕地土壤有机质平均含量分别为31.75 g·kg-1和27.07 g·kg-1，平均降低了4.68 g·kg-1；下降较为明显的区域主要分布在辽东丘陵区、吉林中部地区以及黑龙江中南部地区。土壤有机质半方差函数的最佳理论模型为线性模型，制图结果显示长白山-辽东黑土区耕地土壤有机质含量存在较大空间变异性，呈现出由西南向东北逐级递增的趋势；其中，该区域中部和北部地区耕地土壤有机质含量相对较高（大部分处于20 g·kg-1以上）。此外，耕地土壤有机质含量受海拔、年降水量、土壤类型、土壤母质的影响。其中，在“二普”时期平均有机质含量越高的土壤类型（如泥炭土）中，其有机质含量下降幅度越大；同时，低海拔和低积温条件更易造成耕地土壤有机质含量随时间的下降。总体来看，研究区耕地土壤有机质含量等级属于中等水平，且不同区县耕地土壤有机质含量差异较为明显，实际农业生产活动中需分区进行差异化培肥管理。 |
| 英文摘要: |
| 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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