摘要
[目的]解析蒙古高原土壤水分的时空分异及变化规律并量化关键驱动因素的影响,为区域生态恢复及生态系统可持续发展提供理论依据。[方法]基于ERA5土壤水分数据揭示了2000—2020年蒙古高原0—289 cm土壤水分空间分异特征及变化规律,并量化了气象、归一化植被指数(NDVI)、陆地水储量异常(TWSA)、土壤质地、地形等不同环境因子的影响。[结果](1)2000—2020年蒙古高原土壤水分整体呈东北高、西南低的分布特征。土壤水分由浅至深呈先增加再减少的趋势,且仅深层土壤水分(100—289 cm)变化趋势显著。(2)大部分区域未来变化趋势呈持续稳定状态,从土壤表层到第4层分别有58.5%,76.7%,91.3%,98.8%的区域土壤水分变化趋势与过去相同;蒙古高原西北部及内蒙古中部地区土壤水分干化情况可能会进一步加重。(3)温度、TWSA、降水和NDVI是影响土壤水分空间分布的主导环境因子。大部分因子交互呈现出双因子增强作用,蒙古高原土壤水分空间分异是多因子共同作用的结果。(4)表层和次表层土壤水分的变化主要受降水的正向影响,主控区域分别占98.7%,94.8%;降水和TWSA对28—100 cm土壤水分的主控区域分别集中在森林和草原覆盖区,主导区域面积占比分别为38.7%,38.8%;TWSA降低是导致深层土壤水分干化的主要驱动力且其主控区域面积占比达58.6%;植被耗水的增加以及温度的升高分别主控16.2%,14.8%区域100—289 cm土壤水分变化。[结论]土壤水分的时空分异及变化规律明显,各深度的土壤水分的主要驱动力各有不同,对蒙古高原生态恢复及生态系统可持续发展意义重大,未来应深入分析人类活动对其的影响。
[Objective]The aims of this study are to analyze the spatiotemporal differentiation and variation of soil moisture in the Mongolian Plateau,and to quantify the influence of key driving factors,so as to provide a theoretical basis for regional ecological restoration and sustainable ecosystem development.[Methods]Based on the ERA5 soil moisture data,the spatial differentiation and changes of soil moisture at the depth of 0—289 cm in the Mongolian Plateau from 2000 to 2020 were revealed,and the impacts of different environmental factors such as meteorology,normalized difference vegetation index(NDVI),terrestrial water storage anomaly(TWSA),soil texture,and topography were further quantified.[Results](1)From 2000 to 2020,soil moisture in the Mongolian Plateau displayed a distribution characteristic of high level in the northeast and low level in the southwest.From shallow to deep layers,the soil moisture presented a change trend of no significant increase(0—28 cm),no significant decrease(28—100 cm)and significant decrease(100—289 cm).(2)There were 58.5%,76.7%,91.3%,and 98.8%of the regions with Hurst index greater than 0.5.The change trend of soil moisture in most regions in the future will be the same as in the past.The drying of soil moisture in the northwestern Mongolian Plateau and central Inner Mongolia may further aggravate.(3)Temperature,TWSA,precipitation,and NDVI were the dominant environmental factors affecting the spatial distribution of soil moisture.Most of the factor interactions showed a bi-factor enhancement effect,and the spatial differentiation of soil moisture in the Mongolian Plateau was the result of the joint action of multiple factors.(4)The changes in surface and subsurface soil moisture were mainly positively affected by precipitation,and the dominant control areas accounted for 98.7%and 94.8%of the total vegetated area of the plateau,respectively.The main control areas of precipitation and TWSA on soil moisture at the layer of 28—100 cm concentrated in areas covered by forestland an
作者
董金义
罗敏
孟凡浩
萨楚拉
包玉海
Dong Jinyi;Luo Min;Meng Fanhao;Sa Chula;Bao Yuhai(College of Geographical Sciences,Inner Mongolia Normal University,Hohhot 010022,China;Inner Mongolia Autonomous Region Key Laboratory of Remote Sensing and Geographic Information Systems,Hohhot 010022,China)
出处
《水土保持研究》
CSCD
北大核心
2024年第2期110-121,共12页
Research of Soil and Water Conservation
基金
国家自然科学基金(42101030,42361024,42261079)
内蒙古高校青年科技英才项目(NJYT22027,NJYT23019)
内蒙古师范大学基本科研业务费项目(2022JBBJ014,2022JBQN093)。
关键词
土壤水分
时空变化
蒙古高原
地理探测器
气候变化
soil moisture
spatiotemporal change
Mongolian Plateau
geographic detector
climate change
