Spatio-temporal variability of soil moisture and its effect on vegetation in a desertified aeolian riparian ecotone on the Tibetan Plateau, China

Li, Haidong; Weishou, Shen; Zou, Changxin; Jiang, Jiang; Fu, Lei; Guang-hui, She

doi:10.1016/j.jhydrol.2012.12.002

Cited by 55 publications

(51 citation statements)

References 30 publications

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“…Soil moisture in both soil layers exhibited a patchy pattern under wet condition, and was relatively evenly distributed under dry conditions. A similar observation was reported from a desertified riparian area in Southern China by Li et al [61]. Generally, relatively high soil moisture levels were found on the watershed divide and hillside sites of the catchment ( Figure 5), and relatively low soil moisture levels were observed on the valleyside sites ( Figure 5).…”

Section: Spatial Distribution Of Soil Moisturesupporting

confidence: 87%

“…Moreover, a relatively high elevation in the watershed divide region of the catchment may exhibit lower evaporation rates than elsewhere, and promote moisture retention in soil [65] regardless of the soil moisture conditions. Contrary to that, Li et al [61] found in a semi-arid plateau sites lower soil moisture at higher elevations, and higher soil moisture at lower elevations. Undoubtedly, there was a very variable orographic rain events in the DHV, due to the Foehn phenmena are frequent, resulted in the obvious spatial variability for precipitation.…”

Section: Spatial Distribution Of Soil Moisturementioning

confidence: 60%

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Soil Moisture Variation in a Farmed Dry-Hot Valley Catchment Evaluated by a Redundancy Analysis Approach

Duan

Feng

et al. 2017

Water

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Abstract:Farmed catchments have greater temporal and spatial heterogeneity of soil moisture than natural catchments. Increased knowledge about the variation of soil moisture in farmed catchments has important implications for the adoption of appropriate tillage measures for agriculture. The purpose of this study was to determine the spatial and temporal variability of soil moisture as controlled by the environment on a farmed catchment in a typical dry-hot valley (DHV) by integrating geostatistical and redundancy analysis (RDA). We monitored soil moisture in topsoil (0-20 cm) and subsoil (20-40 cm) layers at 51 points on eight occasions from July 2012 to March 2014, and determined the environmental factors of soil particle-size distribution, soil organic matter, slope aspect, slope gradient, elevation, and a topographic wetness index (WI) modified for semiarid conditions at each point. The results showed that, under the influence of high evaporation, soil moisture in the topsoil was significantly lower than that of subsoil in the DHV. In this study, we observed a strong temporal variation of soil moisture, which was influenced by the seasonal variation of crop cover and lagged behind that of rainfall. Relatively high soil moisture levels were found on the watershed divide and hillside sites of the catchment, and lower on the valleyside sites. Different from other studies, RDA analysis indicated that the WI was not correlated with soil moisture in the DHV; instead, clay and sand levels were the dominant control factor of soil moisture in the farmed DHV. We proposed that soil erosion in the DHV could lead to such increases of sand and decreases of clay content, thus influencing soil moisture content. Soil and water conservation measures will be especially important for valleyside sites with steep slopes.

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Section: Spatial Distribution Of Soil Moisturesupporting

confidence: 87%

Section: Spatial Distribution Of Soil Moisturementioning

confidence: 60%

Soil Moisture Variation in a Farmed Dry-Hot Valley Catchment Evaluated by a Redundancy Analysis Approach

Duan

Feng

et al. 2017

Water

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“…Since [26,[30][31][32]. It seems that revegetation on sandy land may be acted as a double-edged sword: it could increase vegetation greenness, but may also consume the groundwater.…”

Section: Discussionmentioning

confidence: 99%

Dynamic of Dalinor Lakes in the Inner Mongolian Plateau and Its Driving Factors during 1976–2015

Gao

et al. 2017

Water

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Climate change and increasing human activities have induced lake expansion or shrinkage, posing a serious threat to the ecological security on the Inner Mongolian Plateau, China. However, the pattern of lake changes and how it responds to climate change and revegetation have rarely been reported. We investigated the pattern of lake-area changes in the Dalinor National Nature Reserve (DNR) using Landsat imagery during 1976-2015, and examined its relationship with changes in climate and vegetation factors. The total lake-area in the DNR has decreased by 11.6% from 1976 to 2015 with a rate of −0.55 km 2 year −1 . The largest Dalinor Lake reduced the most (by 32.7 km 2 ) with a rate of −0.79 km 2 year −1 . The air temperature has increased significantly since 1976, with a rate of 0.03 • C year −1 (p < 0.05), while the precipitation slightly decreased during 1976-2015, with a rate of −0.86 mm year −1 . The Normalized Difference Vegetation Index (NDVI) increased by 27.7% from 1976 to 2015, especially after 2001 when vegetation has been promoted greatly as a result of the successful ecological protection and restoration in the Dalinor basin. The decrease in lake-areas for the DNR exhibited a negative correlation with NDVI (r = −0.397, p < 0.05) during 1976-2015. It seems that decreasing precipitation drives the reduction in lake-area, while rising temperature and vegetation greenness accelerated this decreasing trend by increasing evapotranspiration. The continuous lake shrinkage increases the ecological risks to the habitat of birds, causing a challenge to the management in the DNR.

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“…For example, rising temperature is the main factor causing grassland greening on the northern plateau, while wetting is the main factor on the southern regions [28]. Other reports show that the high elevations are getting less snow and rainfall [29], and droughts have threatened the vegetation growth on the southern plateau [30]. For example, the migration of tree line in the Himalayas of the Southern Tibetan Plateau is largely controlled by precipitation, rather than temperature as found in the Alps [31].…”

Section: Introductionmentioning

confidence: 99%

Elevation-Dependent Vegetation Greening of the Yarlung Zangbo River Basin in the Southern Tibetan Plateau, 1999–2013

Weishou

et al. 2015

Remote Sensing

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Abstract:The Yarlung Zangbo River basin is an important alley to transport moisture from the Indian Ocean to the inner Tibetan Plateau. With a wide range of elevations from 147 m to over 7000 m above sea level (a.s.l.), ecosystems respond differently to climate change at various elevations. However, the pattern of elevation-dependent vegetation change and how it responds to recent warming have been rarely reported. Here, we investigated the pattern of vegetation greening at different elevations in this river basin using SPOT normalized difference vegetation index (NDVI) data during 1999-2013, and examined its relationship with elevation-dependent changes in temperature and precipitation. The annual NDVI has increased by 8.83% from 1999 to 2013. In particular, the NDVI increased more apparently at lower elevations, but remained relatively stable or even decreased at high elevations. It seems that rising temperature has driven the basin-wide vegetation greening, but the greening rate is in contrast to the pattern of elevation-dependent warming (EDW) with more significant temperature increase at higher elevations. It appears that decreasing precipitation does not reverse the overall increasing trend in NDVI, but relatively limited precipitation (<500 mm) may constrain the NDVI increases, causing apparently stable or even decreased NDVI at higher elevations (>4000 m).

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Spatio-temporal variability of soil moisture and its effect on vegetation in a desertified aeolian riparian ecotone on the Tibetan Plateau, China

Cited by 55 publications

References 30 publications

Soil Moisture Variation in a Farmed Dry-Hot Valley Catchment Evaluated by a Redundancy Analysis Approach

Soil Moisture Variation in a Farmed Dry-Hot Valley Catchment Evaluated by a Redundancy Analysis Approach

Dynamic of Dalinor Lakes in the Inner Mongolian Plateau and Its Driving Factors during 1976–2015

Elevation-Dependent Vegetation Greening of the Yarlung Zangbo River Basin in the Southern Tibetan Plateau, 1999–2013

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