Gu Qian,Geng Guangpo,Zheng Ruolin,et al.Analysis on Spatiotemporal Variation of Soil Moisture and Its Influencing Factors in Weihe River Basin[J].Research of Soil and Water Conservation,2024,31(05):199-211.[doi:10.13869/j.cnki.rswc.2024.05.040]
渭河流域土壤水分时空变化及其影响因素分析
- Title:
- Analysis on Spatiotemporal Variation of Soil Moisture and Its Influencing Factors in Weihe River Basin
- 文章编号:
- 1005-3409(2024)05-0199-13
- 分类号:
- S152.7+1; S127
- 文献标志码:
- A
- 摘要:
- [目的]揭示渭河流域土壤水分时空变化特征,厘清影响土壤水分变化的主要因素,为渭河流域有效监测农业干旱提供科学依据。[方法]基于2000—2020年渭河流域MODIS NDVI、LST数据、气象数据,综合趋势分析、地理探测器等方法,构建NDVI-Ts特征空间,分析了土壤水分时空变化及其驱动因子。[结果]渭河流域近20年土壤水分整体以0.0049/a的速率呈显著下降趋势,有明显变干的现象。在不同土地利用类型中,近20年来土壤水分含量表现为林地>草地>耕地>城市和建设用地。总体干湿等级以正常为主(0.4≤TVDI<0.6),土壤水分的低值区主要分布在渭河流域西部及北部地区,高值区主要集中在东南以及西北边缘地区。子流域中渭河主流域发生干旱面积占比呈现上升趋势,其中渭河主流域南部关中平原土壤水分下降趋势最为显著。探测因子影响力分析发现高程、平均温度、潜在蒸散发是影响渭河流域土壤水分分布的主导因素,其解释力显著高于其他因子; 因子交互作用分析显示平均温度与累计降水量组合对渭河流域土壤水分空间分布有明显的影响。[结论]渭河流域近20年土壤水分显著下降,有明显变干的趋势,流域土壤水分变化主要受地形地貌和气象因素的影响。
- Abstract:
- [Objective]The aims of this study are to reveal the temporal and spatial variation characteristics of soil moisture in the Weihe River Basin, to clarify the main factors affecting soil moisture changes, so as to provide scientific basis for effective monitoring of agricultural drought in the Weihe River Basin. [Methods]Based on the MODIS NDVI, LST data and climatic data of Weihe River Basin from 2000 to 2020, integrated trend analysis and geographic detector, the NDVI-Ts characteristic space was constructed, and the spatiotemporal variation of soil moisture and its driving factors were analyzed. [Results]In the past 20 years, the soil moisture in Weihe River Basin showed a significant downward trend at the rate of 0.004 9/a, and there was an obvious drying phenomenon. In different land use types, the soil moisture contents in the past 20 years followed the order:woodland>grassland>cultivated land>urban and construction land. The overall dry and wet grade was mainly normal(0.4≤TVDI < 0.6). The low value areas of soil moisture mainly distributed in the west and north of Weihe River Basin, and the high value area primarily concentrated in the southeast and northwest edge areas. In the sub-basins, the proportion of drought area in the main basin of Weihe River showed an upward trend, in which the decreasing trend of soil moisture in Guanzhong Plain located in the south of the main basin of Weihe River was the most significant. According to the influence analysis of detection factors, it was found that elevation, the average temperature and the potential evapotranspiration were the main factors affecting soil moisture distribution in Weihe River Basin, and their explanatory power was significantly higher than that of other factors. Factor interaction analysis showed that the combination of the average temperature and the cumulative precipitation had a significant effect on the spatial distribution of soil moisture in Weihe River Basin. [Conclusion]Soil moisture in Weihe River Basin had decreased significantly in the past 20 years, and there was an obvious drying trend. The change of soil moisture in Weihe River Basin was mainly affected by topography, geomorphology and meteorological factors.
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备注/Memo
收稿日期:2023-11-20 修回日期:2023-12-22
资助项目:国家自然科学基金青年项目“渭河流域冬小麦旱灾风险及其对气候变化的响应研究”(41807503)
第一作者:顾倩(1999—),女,江苏扬州人,硕士研究生,研究方向为灾害遥感研究。E-mail:15620532357@163.com
通信作者:耿广坡(1986—),男,河南浚县人,博士,副教授,主要从事区域环境变化与灾害遥感研究。E-mail:gengguangpo@xust.edu.cn