Effects of land‐use changes on hydrological processes in the middle basin of the Heihe River, northwest China

Wang, Genxu; Liu, Jingqi; Kubota, Jumpei; Chen, Ling

doi:10.1002/hyp.6308

Cited by 112 publications

(62 citation statements)

References 15 publications

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“…Significant land use change in the region, resulting in decreases in grassland and water areas and increases in cropland and built-up area, has been identified since the late 1980s (Qi and Luo 2006). Such land use change has pronounced impacts on soil nutrients, water resources, land degradation, and vegetation changes at various scales Qi and Luo 2007;Wang et al 2004Wang et al , 2007Wang et al , 2011a. However, most of the relevant studies have focused on the individual impacts of land use change.…”

Section: Introductionmentioning

confidence: 99%

Effects of Land Use Change on Soil Carbon Storage and Water Consumption in an Oasis-Desert Ecotone

Lü

Zhao

et al. 2014

Environmental Management

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Land use and ecosystem services need to be assessed simultaneously to better understand the relevant factors in sustainable land management. This paper analyzed land use changes in the middle reach of the arid Heihe River Basin in northwest China over the last two decades and their impacts on water resources and soil organic carbon (SOC) storage. The results indicated that from 1986 to 2007: (1) cropland and human settlements expanded by 45.0 and 17.6 %, respectively, at the expense of 70.1, 35.7, and 4.1 % shrinkage on woodland, grassland, and semi-shrubby desert; (2) irrigation water use was dominant and increased (with fluctuations) at an average rate of 8.2 %, while basic human water consumption increased monotonically over a longer period from 1981 to 2011 at a rate of 58 %; and (3) cropland expansion or continuous cultivation led to a significant reduction of SOC, while the land use transition from grassland to semishrubby desert and the progressive succession of natural ecosystems such as semi-shrubby desert and grassland, in contrast, can bring about significant carbon sequestration benefits. The increased water consumption and decreased SOC pool associated with some observed land use changes may induce and aggravate potential ecological risks for both local and downstream ecosystems, including water resource shortages, soil quality declines, and degeneration of natural vegetation. Therefore, it is necessary to balance socioeconomic wellbeing and ecosystem services in land use planning and management for the sustainability of socio-ecological systems across spatiotemporal scales, especially in resource-poor arid environments.

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Section: Introductionmentioning

confidence: 99%

Effects of Land Use Change on Soil Carbon Storage and Water Consumption in an Oasis-Desert Ecotone

Lü

Zhao

et al. 2014

Environmental Management

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“…Mountain environments are sensitive to human activities, particularly to land-cover changes (Bosch and Hewlett, 1982). Water resources and hydrological dynamics in river basins are altered by changes in climate and land cover (Vorosmarty et al, 2000;Wang et al, 2007). Landcover/climate changes are predicted to have important impacts on river flows and water resources from mountain regions.…”

Section: Introductionmentioning

confidence: 99%

Response of hydrological processes to land‐cover and climate changes in Kejie watershed, south‐west China

Xu²,

Luo

et al. 2009

Hydrological Processes

169

106

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Abstract:Land-cover/climate changes and their impacts on hydrological processes are of widespread concern and a great challenge to researchers and policy makers. Kejie Watershed in the Salween River Basin in Yunnan, south-west China, has been reforested extensively during the past two decades. In terms of climate change, there has been a marked increase in temperature. The impact of these changes on hydrological processes required investigation: hence, this paper assesses aspects of changes in land cover and climate. The response of hydrological processes to land-cover/climate changes was examined using the Soil and Water Assessment Tool (SWAT) and impacts of single factor, land-use/climate change on hydrological processes were differentiated. Land-cover maps revealed extensive reforestation at the expense of grassland, cropland, and barren land. A significant monotonic trend and noticeable changes had occurred in annual temperature over the long term. Long-term changes in annual rainfall and streamflow were weak; and changes in monthly rainfall (May, June, July, and September) were apparent. Hydrological simulations showed that the impact of climate change on surface water, baseflow, and streamflow was offset by the impact of land-cover change. Seasonal variation in streamflow was influenced by seasonal variation in rainfall. The earlier onset of monsoon and the variability of rainfall resulted in extreme monthly streamflow. Land-cover change played a dominant role in mean annual values; seasonal variation in surface water and streamflow was influenced mainly by seasonal variation in rainfall; and land-cover change played a regulating role in this. Surface water is more sensitive to land-cover change and climate change: an increase in surface water in September and May due to increased rainfall was offset by a decrease in surface water due to land-cover change. A decrease in baseflow caused by changes in rainfall and temperature was offset by an increase in baseflow due to land-cover change.

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“…Alternatively, when the goal is a post de facto evaluation of an LID intervention, time series analysis can be conducted on rainfall and hydrograph data, provided quality data are available both before and after the intervention. A variety of time series tools are available including graphical methods, 137 153 Interpretation of time series data can be complicated by climate variability over the time of observation. 140,154−157 The gold standard for assessing the hydrologic impact of landuse change is paired (or triplicated) catchment studies, in which the catchment of interest is paired with a control catchment (and a reference catchment, in the case of a triplicate design) of similar climate and physiography.…”

Section: Optimizing Lid Selection At the Catchment Scalementioning

confidence: 99%

From Rain Tanks to Catchments: Use of Low-Impact Development To Address Hydrologic Symptoms of the Urban Stream Syndrome

Askarizadeh

Rippy

Fletcher

et al. 2015

Environ. Sci. Technol.

137

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Catchment urbanization perturbs the water and sediment budgets of streams, degrades stream health and function, and causes a constellation of flow, water quality, and ecological symptoms collectively known as the urban stream syndrome. Low-impact development (LID) technologies address the hydrologic symptoms of the urban stream syndrome by mimicking natural flow paths and restoring a natural water balance. Over annual time scales, the volumes of stormwater that should be infiltrated and harvested can be estimated from a catchment-scale water-balance given local climate conditions and preurban land cover. For all but the wettest regions of the world, a much larger volume of stormwater runoff should be harvested than infiltrated to maintain stream hydrology in a preurban state. Efforts to prevent or reverse hydrologic symptoms associated with the urban stream syndrome will therefore require: (1) selecting the right mix of LID technologies that provide regionally tailored ratios of stormwater harvesting and infiltration; (2) integrating these LID technologies into next-generation drainage systems; (3) maximizing potential cobenefits including water supply augmentation, flood protection, improved water quality, and urban amenities; and (4) long-term hydrologic monitoring to evaluate the efficacy of LID interventions.

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Effects of land‐use changes on hydrological processes in the middle basin of the Heihe River, northwest China

Cited by 112 publications

References 15 publications

Effects of Land Use Change on Soil Carbon Storage and Water Consumption in an Oasis-Desert Ecotone

Effects of Land Use Change on Soil Carbon Storage and Water Consumption in an Oasis-Desert Ecotone

Response of hydrological processes to land‐cover and climate changes in Kejie watershed, south‐west China

From Rain Tanks to Catchments: Use of Low-Impact Development To Address Hydrologic Symptoms of the Urban Stream Syndrome

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