Impacts of Water Level Fluctuations on Soil Aggregate Stability in the Three Gorges Reservoir, China

doi:10.3390/su12219107

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地表生过程与生态调控重点实验室

	Impacts of Water Level Fluctuations on Soil Aggregate Stability in the Three Gorges Reservoir, China
	Nsabimana, Gratien 1,2; Bao, Yuhai 1; He, Xiubin 1; Nambajimana, Jean de Dieu 1,2; Wang, Mingfeng 1,2; Yang, Ling 1,2; Li, Jinlin 1,2; Zhang, Shujuan 1,2; Khurram, Dil 1,2
刊名	SUSTAINABILITY
	2020
卷号	12 期号:21 页码:9107
关键词	soil aggregate stability drying and wetting cycles water-level fluctuation zone laser diffraction three gorges dam
ISSN号	0000
DOI	10.3390/su12219107
产权排序	1
文献子类	Article
英文摘要	Aggregate is the basic unit of soil structure, which is crucial to the sustainability of soil system functions such as structural stability and Fertility Maintenance. Three Gorges Dam (TGD) has extensively led to a dramatic hydrological regime alteration, which may consequently affect various soil physical properties. The aim of this study was to investigate the long-run temporal variation of soil aggregate stability as induced by water-level fluctuations in the riparian zone of the Three Gorges Reservoir (TGR). Sampling plots were established along different elevations considering the interval of 5 m, starting from 150 m to 175 m. A Laser Diffraction based analysis that allows the measurement of soil aggregate stability after the removal of soil organic matter helped to particularly study the effect of external factors on soil aggregate stability of the study area. In addition, wet-sieving method considering the effect of chemical binding agents was used to quantify aggregate stability. The present results indicated a significant increase of Mean Volume Diameter, MVD (p < 0.05) within the study period. Continuous drying-wetting cycles mended soil aggregate stability with a 14.25% increase of the MVD from 2012 to 2016. In the Water-Level Fluctuation Zone (WLFZ), the lower land has predominantly contributed to the increase of soil aggregate stability compared to upper land, with an increase of 62.19% and 37.81% for MVD, 60.88% and 39.12% for D-10, 95.34% and 4.66% for D-90 at lower and upper elevations, respectively. Sediment deposition below 165 m has precluded a direct effect of water stress on soil aggregates, which certainly declined soil disaggregation. The removal of SOM while analyzing aggregate stability by LD may explain the contradiction between the resulted MVD, and the MWD and GMD. The increase of MWD and GMD was mainly attributed to the increase of SOM with r(2) = 0.89 (p < 0.01) and r(2) = 0.90 (p < 0.01), while the increase of MVD was highly predicted by the decrease of SOM with r(2) = 0.88 (p < 0.01). Since this study presents a remarkable change of soil in the riparian area due to dry-wet cycles, our results may help to deeply understand the soil ecology and environmental changes in the WLFZ.
电子版国际标准刊号	2071-1050
资助项目	National Natural Science Foundation of China[41977075] ; National Natural Science Foundation of China[41571278] ; National Natural Science Foundation of China[41771321] ; Sichuan Science and Technology Program[2018SZ0132]
WOS关键词	PARTICLE-SIZE DISTRIBUTION ; ORGANIC-MATTER ; LASER GRANULOMETRY ; RIPARIAN ZONE ; DRYING CYCLES ; CARBON ; ERODIBILITY
WOS研究方向	Science & Technology - Other Topics ; Environmental Sciences & Ecology
语种	英语
出版者	MDPI
WOS记录号	WOS:000589190400001
资助机构	National Natural Science Foundation of China ; Sichuan Science and Technology Program
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/50738]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
通讯作者	Bao, Yuhai
作者单位	1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Nsabimana, Gratien,Bao, Yuhai,He, Xiubin,et al. Impacts of Water Level Fluctuations on Soil Aggregate Stability in the Three Gorges Reservoir, China[J]. SUSTAINABILITY,2020,12(21):9107.
APA	Nsabimana, Gratien.,Bao, Yuhai.,He, Xiubin.,Nambajimana, Jean de Dieu.,Wang, Mingfeng.,...&Khurram, Dil.(2020).Impacts of Water Level Fluctuations on Soil Aggregate Stability in the Three Gorges Reservoir, China.SUSTAINABILITY,12(21),9107.
MLA	Nsabimana, Gratien,et al."Impacts of Water Level Fluctuations on Soil Aggregate Stability in the Three Gorges Reservoir, China".SUSTAINABILITY 12.21(2020):9107.