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Shi P.,CAS Research Center for Eco Environmental Sciences | Shi P.,University of Chinese Academy of Sciences | Huang Y.,Center for Environmental Engineering Evaluation | Chen C.,Center for Environmental Engineering Evaluation | And 4 more authors.
Natural Hazards | Year: 2015

The expansion of large pipelines can strongly affect fragile ecosystems in arid regions. However, the issue of oasis desertification due to pipeline construction has rarely been addressed. In this study, three parallel pipelines routed through the Zhangye Oasis located in the middle Heihe River Basin in northwest China were chosen as a case study, and the intensity and extent of the pipeline construction disturbances on oasis desertification were evaluated using satellite images. The results indicated that land desertification increased from 20,427 ha before the pipeline disturbance to 26,312 ha after the construction in the 5000-m buffer zone. The relative rate of land desertification was used to identify the cumulative impact of pipeline disturbance. The threshold distance of the first pipeline’s disturbance was 2000–3000 m. However, after the second and third pipeline installations, the threshold extended to 3000–4000 m, which may result from the cumulative impact of the incremental projects. The disappearance of soil and vegetation, and rivers across was the direct impacts of the pipelines’ construction on oasis desertification. Cutting and grazing along the ancillary road made for increasing reclamation led to indirect impacts of the pipelines’ construction on oasis degradation. To reduce the effects of pipeline disturbance on oasis desertification, the implementation of mitigation measures such as backfilling the removed soil, recovery of the local vegetation, retirement of the degraded cropland, limitation of ancillary roads, and cross-river cofferdam diversions are recommended for the environmental management of pipeline projects. © 2015, Springer Science+Business Media Dordrecht.


Xiao Q.,Heritage University | Xiao Q.,CAS Research Center for Eco Environmental Sciences | Hu D.,CAS Research Center for Eco Environmental Sciences | Xiao Y.,CAS Research Center for Eco Environmental Sciences | And 3 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2012

Ecological environmental changes play critical roles in economic development, but environment conservation and economic growth always assumes the two-direcrtional interactions between them. When many countries and regions achieved high-speed economic growth, these activities also led to over-exploration and consumption of ecological resources that further caused serious environmental pollution and ecological damage. Based the related research literatures, the e influencing mechanisms of eco-environmental changes on economic growth can be concluded into 3 catagories, but most of the literatures ignored the two-way influencing mechanism between economic growth and ecological environmental changes because the feedback response of ecological environmental changes on economic growth was ignored, which led to a statistically variable deviation because economic growth itself is endogenous variable together determined by environmental change and other factors. Based on the time-series data between 1980-2009, this research conducted a dynamic quantitative analysis on economic development and environmental changes by using co-integration test and variance decomposition model, Compared with the previous studies, this research has mainly the following characteristics: 1)the long-term dynamic impulse response analysis between eco-environmental changes and economic growth using impulse response function method; 2) predictive variance decomposition method is used to further investigate the relative importance level of economic growth and environmental changes in explaining the changes in economic and environmental factors. We have some conclusions as follows: There exists a long-term equilibrium relationship between economic growth and environmental changes. The non-stationary indicators of economic growth and eco-environmental factors becomes stationary treated by a first-order difference technique and have statistically co-integration relations between them. Co-nintegration test showed that per capita GDP, gas discharge, solid wastes, fertilizer usage amount and exploiting of mineral resources by using the test model with intercept and trend term. The trace test and the maximum eigenvalue showed that there exists co-integration relationships among per capita GDP, waste gas discharge amount, solid wastes discharge, fertilizer usage amount and exploitting amount of mineral resources with an 5% of significance level. In the long run, per capita GDP is negatively correlated with waste gas discharge amount and solid waste discharge amount while it is positively correlated with exploiting amount of mineral resources and fertilizer usage intensity. The exploiting amount of mineral resources is negatively correlated with waste gas discharge amount and solid waste discharge amount while positively correlated with per capita GDP. Impulse response analysis based on VECM shows that fast economic growth was the main factor influencing environmental change, and eco-environmental degradation had a feedback actionon economic growth. From the effects of this kind of responses, the negative responses of eco-environmental degradation on economic growth showed that the increase of eco-environmental degradation led to the change in citizens'environmental preference which caused an external pressure on economic growth, but the feedback actions of eco-environmental changes on economic growth had a time delay.


Shi P.,CAS Research Center for Eco Environmental Sciences | Shi P.,University of Chinese Academy of Sciences | Huang Y.,Center for Environmental Engineering Evaluation | Chen H.-B.,Center for Environmental Engineering Evaluation | And 4 more authors.
Agronomy Journal | Year: 2015

Pipeline construction can have considerable effects on agro-ecosystems. However, little research has documented pipeline installation disturbance on agricultural productivity. We sampled three sites in agricultural regions of West China in Gansu and Shaanxi provinces to study the effects of pipeline installation disturbance on crop productivity. Corn yield and five crop growth characteristics were measured and analyzed at six di_ erent distances on both sides of a pipeline at two sites: 0 (trench), 10 (piling or working zone), 20, 50, and 100 m. Crop productivity was assessed at a third site by sampling across pipelines at three different times after their construction (2, 6, and 8 yr). The results showed that agricultural productivity was mainly impaired inside the 20 m on both sides of the pipeline. The level of disturbance on agriculture productivity decreased as distance from pipeline increased. Crop productivity in the affected zones is expected to gradually improve over time. Pipeline installation had significant effect on soil organic matter, N content, and pH, and correlated with crop growth characteristics. Proper soil management practices, such as storing and backfilling topsoil separately from subsurface soil during the installation process, should be addressed to reduce the impacts of pipeline installation on crop productivity. © 2015 by the American Society of Agronomy, 5585. Guilford Road, Madison, WI 53711. All rights reserved.

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