| 三江平原土壤碳库时空变化和影响因素研究 |
| |
| 引用本文： | 刘国栋,戴慧敏,杨泽,许江,张一鹤,魏明辉.三江平原土壤碳库时空变化和影响因素研究[J].现代地质,2021,35(2):443-454. |
| |
| 作者姓名： | 刘国栋 戴慧敏 杨泽 许江 张一鹤 魏明辉 |
| |
| 作者单位： | 1.中国地质调查局 沈阳地质调查中心,辽宁 沈阳 1100342.中国地质调查局 黑土地演化与生态效应重点实验室,辽宁 沈阳 110034 |
| |
| 基金项目： | 中国地质调查局项目“东北黑土地1:25万土地质量地球化学调查”(121201007000161312);中国地质调查局项目“兴凯湖平原及松辽平原西部土地质量地球化学调查”(DD20190520) |
| |
| 摘 要： | 基于东北三江平原土壤地球化学调查数据,估算了表层土壤有机碳密度和碳储量,与全国第二次土壤普查时的土壤有机碳密度进行对比研究,分析了研究区土壤碳库储量及变化的主要影响因素。结果表明:研究区表层土壤碳以有机碳为主,不同土壤类型有机碳密度及总碳密度有明显差异,沼泽土、泥炭土相对区内其他土壤类型的有机碳密度高,平均在8 kg/m2以上。当前土壤有机碳密度>8.4 kg/m2的分布区面积较20世纪80年代明显减少。研究区表层(0~20 cm)土壤有机碳当前储量约为348 Tg,30年间土壤有机碳减少了293.07 Tg,较基期下降45.7%,其中随河流迁出的有机碳约为1.46 Tg。沼泽湿地转变为耕地的土壤有机碳密度平均减少2.8 kg/m2以上。研究认为造成研究区土壤有机碳下降的主要原因是土地利用的急剧变化。沼泽地转为旱地有机碳损失最大,损失达63.47%。其他开垦变化类型造成土壤有机碳损失在40%~50%之间。研究区30年来温度升高导致表层土壤有机碳减少约7.4 Tg,占表层土壤有机碳总减少量的2.52%。
|
| 关 键 词： | 三江平原 土壤 有机碳密度 碳库 土地利用变化 |
| 收稿时间： | 2020-03-23 |
| 修稿时间： | 2020-07-13 |
Temporal and Spatial Changes of Soil Carbon Pool and Its Influencing Factors in the Sanjiang Plain |
| |
| LIU Guodong,DAI Huimin,YANG Ze,XU Jiang,ZHANG Yihe,WEI Minghui.Temporal and Spatial Changes of Soil Carbon Pool and Its Influencing Factors in the Sanjiang Plain[J].Geoscience——Journal of Graduate School,China University of Geosciences,2021,35(2):443-454. |
| |
| Authors: | LIU Guodong DAI Huimin YANG Ze XU Jiang ZHANG Yihe WEI Minghui |
| |
| Institution: | 1. Shenyang Center of China Geological Survey, Shenyang, Liaoning 110034, China2. Key Laboratory for Evolution and Ecological Effect in Black Land of CGS, Shenyang, Liaoning 110034, China |
| |
| Abstract: | Based on the soil geochemical survey data of the Sanjiang Plain in northeast China, the surface soil organic carbon density and carbon reserves were calculated. By comparing the data of Multi-Purpose Regional Geochemical Survey with the second national soil census, this paper analyzed soil pool storage changes and main influencing factors. The results show that in the study area, the surface soil carbon is dominated by organic carbon, and there is significantly difference in the contents of organic carbon density and total carbon density in different soil types. Compared with other soil types in the area, marsh soil and peat soil have high organic carbon density, with an average content of over 8 kg/m2. The current distribution area of soil organic carbon density of >8.4 kg/m2 is significantly lower than that in 1980s.The current reserve of soil organic carbon in the surface layer (0-20 cm) of the study area is about 348 Tg, and the soil organic carbon has decreased by 293.07 Tg in 30 years, which is 45.7% lower than that in the base period. About 1.46 Tg was loss with the migration of water flow to the outside of the basin. The soil organic carbon density of cultivated land transformed from swampy wetlands was reduced by more than 2.8 kg/m2on average. The authors believe that the main reason for the decrease of soil organic carbon in the study area is the rapid change of land use. The land use changes from wetland to dry farmland led to the largest loss of organic carbon, with a loss of 63.47%.Other types of land use changes resulted in soil organic carbon loss between 40% and 50%.The decrease of soil organic carbon pool caused by temperature rise in the study area over the past 30 years was about 7.4 Tg, accounting for 2.52% of the total loss. |
| |
| Keywords: | Sanjiang Plain soil organic carbon density carbon pool land use change |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《现代地质》浏览原始摘要信息 |
| 点击此处可从《现代地质》下载免费的PDF全文 |
|
