Soil moisture dynamics of typical ecosystems in response to precipitation: A monitoring-based analysis of hydrological service in the Qilian Mountains

被引：64

作者：

Sun, Feixiang ^{[1
,2
,3
]}

Lu, Yihe ^{[1
]}

Wang, Jianglei ^{[1
,2
,4
]}

Hu, Jian ^{[1
,2
]}

Fu, Bojie ^{[1
]}

机构：

[1] Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Urban & Reg Ecol, Beijing 100085, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Minist Environm Protect Peoples Republ China, Policy Res Ctr Environm & Econ, Beijing 100029, Peoples R China

[4] Tsinghua Holdings Human Settlements Environm Inst, Beijing 100083, Peoples R China

来源：

CATENA | 2015年 / 129卷

关键词：

Hydrological service; Soil moisture; Ecosystem; Elevation gradient; Temporal variability;

D O I：

10.1016/j.catena.2015.03.001

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Hydrological service by soil under mountain ecosystems is a hot topic in current ecological research. We monitored the precipitation and soil moisture dynamics and measured the soil hydrological parameters of grassland and forest ecosystems along an elevation gradient in the Dayekou catchment of the central Qilian Mountains in northwestern China. Soil moisture dynamics in response to rainfall events exhibit different characteristics with different ecosystems and at different elevations. The soil conditions (including soil texture, soil structure, and soil hydrological parameters), the local meteorological condition, and the physiological characteristics of the vegetation can help explain eco-hydrological differences. The total rainfall increased with an increase in elevation across the rainy season. Soil moisture content increased with an increase in altitude and differs with land cover on average values. Grassland and forest at low elevations have 50% and 41.7% of the soil moisture content level under shrubland at high elevations, and Qinghai spruce forest soil has the greatest "green water (the water used mainly by the ecosystem itself)" capacity. Fluctuation in soil moisture diminishes with increased depth, yet the trend is not obvious under shrubland at high elevations. The sensitivity of soil moisture response to rainfall differed depending on land cover and soil depth. Soil moisture under alpine shrubland is far more sensitive to single rainfall events, whereas other land-cover types display only typical responses in periods of frequent rainfall events (continued-rainfall scale). The study of soil moisture dynamics contributes to research on hydrological service in mountain ecosystems, and is helpful in promoting knowledge innovation regarding the relationship between water and ecosystems. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：63 / 75

页数：13

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