沙漠黄土过渡带典型区农业系统演变及碳排放空间格局
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国家自然科学基金项目(面上项目42071144);陕西师范大学“一带一路”专项科研重点项目(22YDYLZ002);陕西省重点研发计划项目资助(2024SF-YBXM-589);陕西师范大学研究生领航人才培养项目(LHRCCX23165)


Evolution of agricultural system and spatial pattern of carbon emission in typical desert loess transition zone
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National Natural Science Foundation of China (Grant No. 42071144) ; Special Scientific Research Project of Shaanxi Normal University (22YDYLZ002) ;Key Research and Development Program of Shaanxi (2024SF-YBXM-589);Excellent Graduate Training Program of Shaanxi Normal University(LHRCCX23165)

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    摘要:

    随着全球城市化加速和粮食需求激增,农业活动不断向高原和旱地等脆弱区域扩展,这些区域往往是大规模生态保护和恢复工程重点投资区。前期调研发现沙漠黄土过渡带这一具有重要生态与生产价值的区域通过大规模生态保护与恢复工程促进生态系统恢复和农业现代化转型,提高当地社区收入。然而农业快速发展伴随的碳排放问题对区域生态和全球气候构成威胁,因此本研究聚焦于榆阳区,深入探究农业碳排放规律和空间格局,根据作物分布和农业生产过程碳排放环节,构建榆阳区地块尺度农业碳排放计算框架,利用空间相关性模型测算农业碳排放的空间集聚规律,旨在评估农业活动对该区域环境的影响,为可持续发展提供科学依据。结果表明:(1)区域农业发展并未破坏现有的植被恢复成果,从2000年到2020年,农田面积约增加28.49%,NDVI上升地区面积为6975.62 km2;(2)农业系统在生产规模和经济产出上都有了显著的增长,水浇地由2000年的30721 hm2增长到2020年的60298 hm2,农牧业产值从2000年到2020年增长16.39倍;(3)榆阳区农业碳排放总量为35.602×104 t,化肥、灌溉、肠胃发酵、粪便排放产生的碳排放量多;(4)农业碳排放强度呈现“北部高,南部低”的空间格局。建议北部高-高聚集区域加强农业规模化经营、减少能源和农资投入,南部低-低聚集区域完善农业基础设施、推广太阳能提水灌溉技术,实现区域农业低碳绿色发展。研究结果可为农业碳排放监督管理、农业各区碳排放优化策略提供参考,推动农业与生态环境的可持续发展建设。

    Abstract:

    Globally accelerating urbanization and surging food demands have led to the expansion of agricultural activities into fragile areas like plateaus and arid lands,typically prioritized for large-scale ecological conservation and restoration initiatives. Initial research indicates that the desertloess transition zone,an area of considerable ecological and productive importance,has utilized large-scale ecological conservation and restoration efforts to foster ecosystem recovery and agricultural modernization,subsequently boosting local community incomes. Nevertheless,the rapid expansion of agriculture has brought about a new concern. The carbon emissions associated with this growth pose a threat to both regional ecological balance and the global climate. In light of this,the current study zooms in on Yuyang District,aiming to dissect the patterns and spatial distribution of agricultural carbon emissions. By taking into account the crop distribution and various carbon emission sources during agricultural production,a specialized calculation framework for agricultural carbon emissions at the plot scale within Yuyang District has been constructed. Spatial correlation models were utilized to measure the spatial agglomeration patterns of agricultural carbon emissions,with the goal of evaluating the environmental impact of agricultural activities and establishing a scientific foundation for sustainable development. The findings indicate: (1) Regional agricultural development has not compromised existing vegetation restoration efforts,with an expansion of farmland area by approximately 28.49% from 2000 to 2020,and 6975.62 square kilometers showing an increase in Normalized Difference Vegetation Index (NDVI); (2) The agricultural system has seen significant growth in production scale and economic output,with irrigated farmland expanding from 30,721 hectares in 2000 to 60,298 hectares in 2020,and agriculture and animal husbandry production values increasing by 16.39 times from 2000 to 2020; (3) The total agricultural carbon emissions in Yuyang District amount to 356,02 tons,with significant contributions from fertilizer use,irrigation,enteric fermentation,and manure emissions; (4) The intensity of agricultural carbon emissions displays a spatial pattern,being more concentrated in the north compared to the south. It is recommended that high-aggregation areas in the north strengthen large-scale agricultural operations and reduce energy and agricultural input,while low-aggregation areas in the south improve agricultural infrastructure and promote solar-powered water lifting irrigation technologies to achieve low-carbon and green agricultural development in the region. The research results can provide references for the supervision and management of agricultural carbon emissions and the optimization strategies of carbon emissions in different agricultural regions,promoting the sustainable development and construction of agriculture and the ecological environment.

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吴颖欣,梁伟,苟芬,傅伯杰,吕一河,李海宝,王佳怡.沙漠黄土过渡带典型区农业系统演变及碳排放空间格局.生态学报,2025,45(7):3142~3156

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