| 摘要: |
| 【目的】星云湖作为人类农业生产活动影响下环境问题突出的代表性高原湖泊，其水体健康与生态平衡对于区域可持续发展至关重要。因此，量化解析星云湖流域人类活动净氮磷输入时空来源变化及影响因素对于流域管理和湖泊恢复具有重要意义。【方法】基于社会经济统计数据，采用人类活动净氮、磷输入（NANI、NAPI）模型量化了星云湖流域NANI、NAPI强度。【结果】结果表明，1989—2020年研究区NANI、NAPI均值分别为（14 614±2 196）kg·km-2·a-1和（3 135±452）kg·km-2·a-1，时间上呈现先上升后下降的变化趋势，且峰值出现在2015年，分别达到18 076和3 889 kg·km-2·a-1；空间分布上，除东部NANI、NAPI较低外，其余区域均较高；化肥和食物/饲料输入分别是NANI和NAPI的最大来源，分别占比为58.2%~63.8%和30.5%~59.5%。此外，基于模型选择和变量重要性分析发现，经济作物产量和畜禽密度是影响NANI、NAPI变化的最主要因素。【结论】因此，星云湖流域氮磷管控应从调整种植结构和模式等控源措施入手，加快经济模式转型。本研究结果可为星云湖流域建立有效的氮磷综合管理措施提供科学依据。 |
| 关键词: 人类活动净氮输入 人类活动净磷输入 高原湖泊 乡镇尺度 农业活动影响 |
| DOI： |
| 分类号: |
| 基金项目:中国科学院重大资助项目 |
|
| Spatiotemporal variation of net nitrogen and phosphorus input and its influencing factors in a typical plateau lake: A case study of Xingyun Lake |
|
BAI Jiaojie1, MENG Cen2, LIYuyuan2, WU Dafu1, WANG Shuaibing3, SUN zhandong4, WU qinglong4, WU Jinshui2
|
|
1.College of Resources and Environment,Henan University of Science and Technology;2.Institute of Subtropical Agriculture,Chinese Academy of Sciences;3.School of Chemical Biology and Environment;4.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences
|
| Abstract: |
| As a representative plateau lake with prominent environmental issues under the influence of human agricultural activities, the water environment and ecological balance of Xinyun Lake are crucial for regional sustainable development. Therefore, quantitatively analyzing the spatial and temporal variations and influencing factors of human nitrogen and phosphorus inputs in the Xingyun Lake Basin is of great significance for basin management and lake restoration. Methods: Based on socio-economic statistical data, the human activity-based Net Anthropogenic Nitrogen and Phosphorus Inputs (NANI and NAPI) models were used to quantify the NANI and NAPI intensities in the Xingyun Lake Basin. Results: The results showed that the mean values of NANI and NAPI in the study area from 1989 to 2020 were(14,614±2,196)kg·km-2·a-1 and(3,135±452)kg·km-2·a-1, respectively. They exhibited an upward trend followed by a downward trend over time, with peak values occurring in 2015 at 18,076 and 3,889 kg·km-2·a-1, respectively. In terms of spatial distribution, except for the lower levels in the eastern region, NANI and NAPI were relatively high in other areas. Fertilizer and food/feed inputs were identified as the largest sources of NANI and NAPI, accounting for 58.2%~63.8% and 30.5%~59.5%, respectively. Furthermore, based on model selection and variable importance analysis, economic crop yield and livestock density were found to be the most significant factors affecting the changes in NANI and NAPI. Conclusions: Therefore, nitrogen and phosphorus control in the Xingyun Lake Basin should start with source control measures such as adjusting planting structure and patterns, and increasing employment opportunities for residents. The findings of this study can provide scientific evidence for the establishment of effective comprehensive nitrogen and phosphorus management measures in the Xingyun Lake Basin. |
| Key words: net anthropogenic nitrogen inputs net anthropogenic phosphorus inputs plateau lake towns scale impact of agricultural activities |
