| 黄土高原植被碳源/汇估算及其对土地利用变化的响应：以延河流域为例 |
| 摘要点击 982 全文点击 115 投稿时间：2023-12-17 修订日期：2024-05-08 |
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| 中文关键词 净生态系统生产力（NEP） 碳汇 土地利用 时空变化 延河流域 |
| 英文关键词 net ecosystem productivity（NEP） carbon sink land use spatiotemporal variation Yanhe River Basin |
| 作者 | 单位 | E-mail | | 管亚兵 | 自然资源部国土整治中心(自然资源部土地科技创新中心), 北京 100035
自然资源部土地整治重点实验室, 北京 100035 | guanyabing@mail.bnu.edu.cn | | 王军 | 自然资源部国土整治中心(自然资源部土地科技创新中心), 北京 100035
自然资源部土地整治重点实验室, 北京 100035 | wangjun@lcrc.org.cn | | 覃莉 | 自然资源部国土整治中心(自然资源部土地科技创新中心), 北京 100035
自然资源部土地整治重点实验室, 北京 100035 | | | 杨胜天 | 北京师范大学水科学研究院, 北京 100875 | | | 赵文武 | 北京师范大学地理科学学部, 陆地表层系统科学与可持续发展研究院, 北京 100875 | | | 陈珂 | 黄冈师范学院地理与旅游学院, 黄冈 438000 | | | 张西彤 | 黄冈师范学院地理与旅游学院, 黄冈 438000 | |
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| 中文摘要 |
| 土地利用变化引起的生态系统类型转变对于区域碳循环有着极其重要的影响. 研究植被碳源/汇对土地利用变化的响应,有助于增进对土地利用变化过程的植被碳汇效应的理解. 采用CASA模型和土壤微生物呼吸模型,结合遥感、气象和土地利用等数据估算了延河流域2000~2020年植被净生态系统生产力（NEP）,识别了碳源/汇时空格局演变特征,分析了碳源/汇对土地利用变化的响应. 结果表明,2000~2020年,延河流域NEP呈现出上游较低、中游和下游较高的空间分布格局,流域整体上属于弱碳汇区. 流域固碳能力在显著提升,年NEP显著和极显著增加区域占流域面积的65.78%,年NEP恢复类型、基本稳定类型和退化类型分别占流域面积的79.7%、10.15%和10.15%. 延河流域土地利用主要向促进碳汇能力提升的方向转型,土地类型向林地的转型对碳汇量提升效果更显著. 延河流域5类主要土地利用转型过程中,耕地转为林地NEP恢复的稳定性最强,耕地和草地相互转型NEP恢复的波动性较强. 在耕地和草地相互调整时,应注重选取适宜植被类型并合理增加植被覆盖度来提升固碳增汇能力,避免两者之间转型过程中出现碳亏损. 研究方法和结果可为土地管理部门制定科学合理的土地利用决策、促进植被固碳增汇提供参考. |
| 英文摘要 |
| The transformation of ecosystem types caused by land use change plays an extremely important role in the regional carbon cycle. Studying the response of vegetation carbon source/sink systems to land use change is helpful to improve the understanding of the vegetation carbon sink effect in the process of land use change. However, few studies have focused on the response of vegetation carbon sources/sinks to land use change. The CASA model and soil microbial respiration model were combined to estimate the net ecosystem productivity （NEP） of vegetation in the Yanhe River Basin in the Chinese Loess Plateau from 2000 to 2020 based on remote sensing, meteorological, and land use data. The spatiotemporal pattern evolution characteristics of the carbon source/sink and land use were identified using a significance test, univariate linear regression analysis, and land use status transition matrix methods, and the response of the carbon source/sink to land use change was further analyzed. The results showed that from 2000 to 2020, the multi-year average NEP in the Yanhe River Basin showed a spatial distribution pattern of lower in the upstream and higher in the midstream and downstream. The Yanhe River Basin belonged to a weak carbon sink area as a whole, with this type of area accounting for 88.81% of the basin area. The annual NEP of the basin showed a significant increase trend in fluctuations, and the carbon sequestration capacity was gradually improving. The areas with significant and extremely significant increases in annual NEP accounted for 65.78% of the basin area, and the types of annual NEP restoration, basic stability, and degradation accounted for 79.70%, 10.15%, and 10.15% of the basin area, respectively. Over the past 20 years, the land use transformation of Yanhe River Basin mainly included five types, that is, cropland was converted into grassland, woodland, and construction land, and grassland was converted into cropland and woodland. The land use in the Yanhe River Basin was mainly shifting towards promoting the improvement of the carbon sink capacity, and the transformation of land type to woodland had a more significant effect on improving carbon sink capacity. During the five main land use transformation processes in the Yanhe River Basin, the area ratio of NEP recovery-recovery type for cropland shifting to woodland was the highest at 80.78%. The area ratios of NEP recovery-recovery type for grassland shifting to cropland and cropland shifting to grassland were relatively low, at 48.05% and 51.97%, respectively. The stability of NEP restoration when shifting cropland to woodland was the strongest, and the fluctuation of NEP restoration when shifting between cropland and grassland mutually was strong. When adjusting cropland and grassland mutually, attention should be paid to select suitable vegetation types and increase vegetation coverage reasonably to improve carbon sequestration and sink enhancement capabilities, so as to avoid carbon losses during land transformations. The research methods and results in this study can provide reference for land management departments to formulate scientific and reasonable land use decisions to promote vegetation carbon sequestration and sink enhancement. |
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