Impacts of land use and plant characteristics on dried soil layers in different climatic regions on the Loess Plateau of China

Wang, Yunqiang; Shao, Mingan; Zhu, Yanhui; Liu, Zhipeng

doi:10.1016/j.agrformet.2010.11.016

Cited by 471 publications

(326 citation statements)

References 36 publications

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“…In terms of climate extremes, trends in the hot-day threshold (maximum temperature 90th percentile -the 10th hottest day per season), the cold-night threshold (minimum temperature 10th percentile -the 10th coldest night per season), and the longest heatwave (maximum number of consecutive days with maximum temperature N long-term 90th percentile for each calendar day) have increased over the period 1961 to 2007, whereas the number of frost days has decreased (Li et al, 2010). Indices for extreme precipitation, such as the heavy rainfall threshold, the number of days with heavy rainfall, and the number of days with erosive rainfall (R12mm), were spatially distributed and decreased from the southeast to the northwest (Li et al, 2010;Wang et al, 2011a).…”

Section: Introductionmentioning

confidence: 98%

“…1). This region has a distinctive landscape where the main geomorphic landforms are "yuan" (cliff-edged plains), ridges, hills, and gullies of various sizes (Wang et al, 2011a). Most of the Loess Plateau is covered by loess deposits ranging from 30 m to 80 m in thickness; loess is a highly erosionprone soil that is susceptible to the forces of wind and water (Chen et al, 2008;Wang et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Temperature and precipitation changes over the Loess Plateau between 1961 and 2011, based on high-density gauge observations

Sun

Miao

Duan

et al. 2015

Global and Planetary Change

118

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a b s t r a c t a r t i c l e i n f oThe Loess Plateau has the most serious soil erosion in China and is the main source of sediment in the Yellow River. In this study, we systematically analyzed the changes in the mean and extreme values for temperature and precipitation over the Loess Plateau between 1961 and 2011, using a gridded dataset with high-density gauge data. Statistically significant positive trends (p b 0.05) in the mean, maximum, and minimum temperature values (TM, TX, and TN) were identified in almost all regions. Warming rates increased from the southeast to the northwest of the Loess Plateau for both TM and TN; however, for TX, the greatest warming increases were observed in the southeast region. We also found general decreases in the diurnal temperature range and the number of cold nights and cold days, and increases in the length of the growing season and the number of warm days and warm nights. Moreover, relatively intense changes occurred in the high percentile ranges for both TX and TN. The total amount of precipitation on wet days decreased over a large area of the Loess Plateau, particularly in the southeast region. The inequality in the spread of precipitation over the year (temporal inequality) increased extensively over the past fifty years in the wet region. Approximately 37.60% of the total area with a reduced amount of precipitation had concurrent decreases in both the frequency and intensity of rainfall. However, approximately 37.20% of the area with a reduced amount of precipitation had decreases in the frequency but increases in the intensity of rainfall. The proportion of days with light or moderate precipitation was decreased in the wet region which mainly located in the southwest of the Loess Plateau, but there were only minor changes in extreme precipitation events. Overall, when both temperature and precipitation changes were combined, we observed that the southwest of the Loess Plateau has undergone the largest degree of climate change. Consequently, both the ecological environment and local agriculture on the Loess Plateau will suffer increased challenges: the decline in water availability will lead to more frequent droughts, yet the risk of flood and soil erosion from extreme precipitation events will not be reduced.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Temperature and precipitation changes over the Loess Plateau between 1961 and 2011, based on high-density gauge observations

Sun

Miao

Duan

et al. 2015

Global and Planetary Change

118

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“…The gravimetric soil water content (g H 2 O/100 g dry soil, %), soil particle composition, SOC content and live-root biomasses were measured in the laboratory by oven-drying, laser diffraction, the dichromate-oxidation method and weighing, respectively, as described in detail in Wang et al (2011).…”

Section: Experimental Data For Soil Roots and Aboveground Biomassmentioning

confidence: 99%

“…The increasing depth of depletion of SWC within a soil profile by plants is a feedback of negative water balance (Davidson et al, 2011) which may result in a decrease in inputs (i.e., rainfall) and/or an increase in outputs (i.e., evapotranspiration) (Liu and Sang, 2013;Wang et al, 2011). The formation of a dried soil layer (DSL) was reported to be a typical response to the negative water balance (Li, 1983).…”

Section: Introductionmentioning

confidence: 99%

“…The formation of a dried soil layer (DSL) was reported to be a typical response to the negative water balance (Li, 1983). Definitions, basic characteristics, dynamics, evolution, regional distributions and factors influencing the DSL have been reported Wang et al, 2008;Wang et al, 2011), but the sampling depth in most published studies was shallower than 1000 cm.…”

Section: Introductionmentioning

confidence: 99%

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Choosing an optimal land-use pattern for restoring eco-environments in a semiarid region of the Chinese Loess Plateau

Wang

Shao

Zhang

et al. 2015

Ecological Engineering

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A B S T R A C TThe natural environments in the semiarid regions of the Chinese Loess Plateau (CLP) are fragile due to the serious soil erosion and the weak ecological services of the plants. To ascertain and then evaluate a sustainable land-use pattern in these regions, we selected six typical land-use patterns (i.e., a farmland, a natural grassland, a homogeneous shrubland (S), a mix of shrubland and cultivated grassland (S-Alf), a mix of shrubland and orchard (S-O) and a mix of shrubland and grassland (S-G)) on the plateau and then measured the soil water, related soil properties and plant root indices to a depth of 1800 cm. We also measured the aboveground net primary productivities (ANPPs). The mean soil water content (SWC) within the 0-1800 cm profile was significantly highest (15.2%) in farmland, followed by grassland (11.4%) and S-Alf (8.0%). The available water (AW), the ratio between AW and AW capacity, and the thickness of the dried soil layers also demonstrated that farmland had the best conditions of soil water, followed by grassland and shrubland. The aboveground biomasses of grassland in both non-growing (140 g m À2 ) and growing (370 g m À2 ) seasons were significantly higher than those of shrublands. The ANPPs of the grassland (2.0 g m À2 d À1 ) demonstrated a similar trend. The patterns of land use (including the mixtures of different plant species) greatly affected the patterns of vertical distribution and quantities of soil water within the 1800-cm profile. The data for the soil-water regime and the ANPP further indicated that grassland would be an optimal use of the land for these semiarid regions. This information should be useful to the ecological scientists and policy makers for developing strategies for the sustainable management of vegetation on the CLP and possibly other water-limited regions around the world.

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Quantifying the influence of deep soil moisture on ecosystem albedo: The role of vegetation

et al. 2014

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As changes in precipitation dynamics continue to alter the water availability in dryland ecosystems, understanding the feedbacks between the vegetation and the hydrologic cycle and their influence on the climate system is critically important. We designed a field campaign to examine the influence of two-layer soil moisture control on bare and canopy albedo dynamics in a semiarid shrubland ecosystem. We conducted this campaign during 2011 and 2012 within the tower footprint of the Santa Rita Creosote Ameriflux site. Albedo field measurements fell into one of four Cases within a two-layer soil moisture framework based on permutations of whether the shallow and deep soil layers were wet or dry. Using these Cases, we identified differences in how shallow and deep soil moisture influence canopy and bare albedo. Then, by varying the number of canopy and bare patches within a gridded framework, we explore the influence of vegetation and soil moisture on ecosystem albedo. Our results highlight the importance of deep soil moisture in land surfaceatmosphere interactions through its influence on aboveground vegetation characteristics. For instance, we show how green-up of the vegetation is triggered by deep soil moisture, and link deep soil moisture to a decrease in canopy albedo. Understanding relationships between vegetation and deep soil moisture will provide important insights into feedbacks between the hydrologic cycle and the climate system.

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Impacts of land use and plant characteristics on dried soil layers in different climatic regions on the Loess Plateau of China

Cited by 471 publications

References 36 publications

Temperature and precipitation changes over the Loess Plateau between 1961 and 2011, based on high-density gauge observations

Temperature and precipitation changes over the Loess Plateau between 1961 and 2011, based on high-density gauge observations

Choosing an optimal land-use pattern for restoring eco-environments in a semiarid region of the Chinese Loess Plateau

Quantifying the influence of deep soil moisture on ecosystem albedo: The role of vegetation

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