Ejin Oasis Land Use and Vegetation Change between 2000 and 2011: The Role of the Ecological Water Diversion Project

Hu, Xiao-Li; Lu, Lei; Li, Xin; Wang, Jianhua; Lü, Xianguo

doi:10.3390/en8077040

Cited by 35 publications

(32 citation statements)

References 30 publications

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“…In the Lower Heihe River Basin, the local vegetation heavily depends on the surface water and groundwater replenished by runoff of the Heihe River, but unfortunately vegetation cover has degraded seriously during past decades, leading to serious decline of key ecosystem services, e.g., biomass accumulation and soil conservation [34]. To restore the ecological environment in the Lower Heihe River Basin, the Ecological Water Diversion Project was implemented in 2000, which led to remarkable changes in vegetation cover and efficiency of PAR interception and absorption, causing great concerns about uncertainties in provision of ecosystem services under different water resource management conditions [54]. …”

Section: Study Areamentioning

confidence: 99%

“…The climate change is a primary driving force for terrestrial ecosystem productivity [17][18][19], and the effects of climate change on biomass accumulation can be reflected with different scenarios with changes of climatic factors [75]. Besides, the human activities can be categorized into explicit and implicit LUCC, i.e., LC due to internal human activities and FVCC due to the water diversion since water diversion has great influence on the water availability and subsequently the fractional vegetation cover in the study area [47,54,74]. The effects of LC on biomass accumulation can be reflected with scenarios with different land use data, while the effects of FVCC on biomass accumulation can be reflected with scenarios with different fAPAR data since the fractional vegetation cover is linearly related with fAPAR.…”

Section: Scenario Developmentmentioning

confidence: 99%

“…In addition, the simulation period was set to be [2001][2002][2003][2004][2005][2006][2007][2008][2009][2010] in this study since the Ecological Water Diversion Project was implemented in 2000. Moreover, the total of annual biomass accumulation during 2001-2010 were further summarized since major carbon and energy fluxes between the atmosphere and terrestrial biosphere are often expressed in terms of net biomass accumulation from annual NPP and the effects of some influencing factors on biomass accumulation are expected to be lagged as vegetation shows inertial dynamics associated to its dependence on water resources and soil characteristics [12,47,54,72,76].…”

Section: Scenario Developmentmentioning

confidence: 99%

“…What is worse, climate change and human activities have further aggravated the drought stress that reduces the biomass accumulation of vegetation in these regions [34,[46][47][48][49][50]. The rational water allocation has been considered as the fundamental method to solve problems resulting from water scarcity [48,[51][52][53], for example, the Chinese government implemented the Ecological Water Diversion Project in 2000 to address the severe ecological degradation in the Heihe River Basin, the second largest inland river basin in Northwest China [28,54]. However, much remains unknown about the impacts of water diversion and other influencing factors on ecosystem services in this region [34,[55][56][57][58].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Climate Change and LUCC on Terrestrial Biomass in the Lower Heihe River Basin during 2001–2010

Yan

Zhan

et al. 2016

Energies

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Ecosystem services are tightly coupled with availability of solar energy and its partition into energy fluxes, and biomass accumulation, which represents the energy flux in ecosystems, is a key aspect of ecosystem services. This study analyzed the effects of climate change and land use and land cover change (LUCC) on the biomass accumulation change in the Lower Heihe River Basin during 2001-2010. Biomass accumulation was represented with net primary productivity (NPP), which was estimated with the C-Fix model, and scenario analysis was carried out to investigate effects of climate change and LUCC on biomass accumulation change in a spatially explicit way. Results suggested climate change had an overall positive effect on biomass accumulation, mainly owning to changes in CO 2 concentration and temperature. LUCC accounted for 70.61% of biomass accumulation change, but primarily owning to fractional vegetation change (FVCC) rather than land conversion, and there is a negative interactive effect of FVCC and climate change on biomass accumulation, indicating FVCC resulting from water diversion played a dominant in influencing biomass accumulation. These results can provide valuable decision support information for the local ecosystem managers and decision makers to guarantee sustainable provision of essential ecosystem services.

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Section: Study Areamentioning

confidence: 99%

Section: Scenario Developmentmentioning

confidence: 99%

Section: Scenario Developmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Climate Change and LUCC on Terrestrial Biomass in the Lower Heihe River Basin during 2001–2010

Yan

Zhan

et al. 2016

Energies

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“…The implementation of the Heihe water diversion policy was the main factor affecting changes in the utilization of water resources in the HRB in recent years and was also essential to wetland changes. To curb the ecological deterioration of the lower reaches of Heihe, the Heihe water diversion plan has been formally applied since 2000 [43], adding water diversion to the downstream. The pilot program of the construction of the water-saving society in Zhangye district ("Heihe Water-Saving Project") was officially approved by the Ministry of Water Resources (MWR) in 2002, and one of its objectives was to improve the utilization of agricultural water in the middle reaches of Heihe through the construction of diversion channels in the middle reaches, the standardization of irrigation systems, increasing the efficiency of water resource management and the reduction in regional water disputes [44].…”

Section: Policy Influencesmentioning

confidence: 99%

Impacts of Climate Change and Anthropogenic Activities on the Ecological Restoration of Wetlands in the Arid Regions of China

Wang

2016

Energies

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Abstract:As an important part of the global ecosystem, wetlands and their dynamics greatly influence regional eco-environment systems. To understand the distributions, change processes and temporal-spatial characteristics of the wetlands of the inland river basin in an arid region (Heihe River Basin, HRB), this paper employed multi-source remote sensing data to facilitate multi-temporal monitoring of the HRB wetland using a wetland information extraction method. First, we performed monitoring of these wetlands for the years 2000, 2007, 2011 and 2014; then, we analyzed the variation characteristics of the spatial-temporal dynamics of the wetlands in the HRB over the last 15 years via the landscape dynamic change model and the transformation matrix. In addition, we studied the possible driving mechanisms of these changes. The research results showed that the total area of the HRB wetlands had decreased by 2959.13 hectares in the last 15 years (Since 2000), and the annual average loss was´1.09%. The dynamics characterizing the HRB wetlands generally presented a trend of slow increase after an initial decrease, which can be classified into three stages. From 2000 to 2007, the total wetland area rapidly decreased; from 2007 to 2011, the area slowly decreased; and from 2011 to 2014, the area gradually increased. The dynamic changing processes characterizing the wetland resources were ascribed to a combination of natural processes and human activities. The main driving mechanisms of wetland dynamic changes include climatic conditions, upper reach water inflows, population, water resources, cultivated area, and policy. The findings of this study can served as reference and support for the conservation and management of wetland resources in the HRB.

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Hydrological Cycle in the Heihe River Basin and Its Implication for Water Resource Management in Endorheic Basins

et al. 2018

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Endorheic basins around the world are suffering from water and ecosystem crisis. To pursue sustainable development, quantifying the hydrological cycle is fundamentally important. However, knowledge gaps exist in how climate change and human activities influence the hydrological cycle in endorheic basins. We used an integrated ecohydrological model, in combination with systematic observations, to analyze the hydrological cycle in the Heihe River Basin, a typical endorheic basin in arid region of China. The water budget was closed for different landscapes, river channel sections, and irrigation districts of the basin from 2001 to 2012. The results showed that climate warming, which has led to greater precipitation, snowmelt, glacier melt, and runoff, is a favorable factor in alleviating water scarcity. Human activities, including ecological water diversion, cropland expansion, and groundwater overexploitation, have both positive and negative effects. The natural oasis ecosystem has been restored considerably, but the overuse of water in midstream and the use of environmental flow for agriculture in downstream have exacerbated the water stress, resulting in unfavorable changes in surface‐ground water interactions and raising concerns regarding how to fairly allocate water resources. Our results suggest that the water resource management in the region should be adjusted to adapt to a changing hydrological cycle, cropland area must be reduced, and the abstraction of groundwater must be controlled. To foster long‐term benefits, water conflicts should be handled from a broad socioeconomic perspective. The findings can provide useful information on endorheic basins to policy makers and stakeholders around the world.

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Ejin Oasis Land Use and Vegetation Change between 2000 and 2011: The Role of the Ecological Water Diversion Project

Abstract: Ejin Oasis, located in the lower reaches of the Heihe

Cited by 35 publications

References 30 publications

Effects of Climate Change and LUCC on Terrestrial Biomass in the Lower Heihe River Basin during 2001–2010

Effects of Climate Change and LUCC on Terrestrial Biomass in the Lower Heihe River Basin during 2001–2010

Impacts of Climate Change and Anthropogenic Activities on the Ecological Restoration of Wetlands in the Arid Regions of China

Hydrological Cycle in the Heihe River Basin and Its Implication for Water Resource Management in Endorheic Basins

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