Effect of agricultural economic growth on sandy desertification in Horqin Sandy Land

Ge, Xiaodong; Li, Yaoguang; Luloff, A. E.; Dong, Kaikai; Xiao, Jun

doi:10.1016/j.ecolecon.2015.08.006

Cited by 57 publications

(12 citation statements)

References 61 publications

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“…Remote sensing and GIS are powerful tools for monitoring sand encroachment dynamics, which, integrated with ground observations, provide valid mapping techniques (Brownett & Mills, 2017;Ge, Li, Luloff, Dong, & Xiao, 2015). Several authors have employed these techniques in similar studies in Tunisia, focusing on geomorphological, socio-economic or ecological aspects (Essifi, Ouessar, & Rabia, 2009;Hanafi & Jauffret, 2008;Lorenz, Gasmi, Radebaugh, Barnes, & Ori, 2013;Ouerchefani, Dhaou, Delaitre, Callot, & Abdeljaoued, 2013).…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal and spectral analysis of sand encroachment dynamics in southern Tunisia

Afrasinei

Melis

Arras

et al. 2018

European Journal of Remote Sensing

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Aeolian processes in drylands often transcend into sand encroachment, a common form of land degradation. Highly reflective desert features, hence sandy areas, often cause spectral confusion, and mapping through remote sensing techniques can be challenging. This work aims at designing an efficient classification method that minimises spectral confusion of desert features, hence two types of sandy areas. Moreover, we employ land cover (LC) change detection over the last 30 years. The extraction and spatiotemporal variations of LC and sand encroachment areas in the Dahar-Jeffara Medenine site (southeastern Tunisia) are assessed by employing Landsat imagery (1984 and 2014), a 30 m digital elevation model of Shuttle Radar Topography Mission (SRTMGL 1 arc second), field data and X-ray diffraction analyses of sand samples. Five new spectral indices were designed and employed in a Decision Tree (DT) classifier for the extraction of 11 LC classes, including two different types of sandy areas. The DT map yielded an overall accuracy of around 89%. Change detection results showed substantial change in several landscape components and an increase of sand units by 29% within the Jeffara-Medenine plain over the last three decades. Geomorphological observations and multi-temporal, spectral and mineral analyses indicate a main, possible in-situ source area of sand. ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Spatiotemporal and spectral analysis of sand encroachment dynamics in southern Tunisia

Afrasinei

Melis

Arras

et al. 2018

European Journal of Remote Sensing

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“…Thus, people have no opportunity to earn money from local non-agricultural industries and in other places. People have to make their living from agriculture (Ge et al, 2015). Therefore, if cultivated land is abandoned for ecological restoration in the agro-pastoral ecotone, then the profit loss from maize plantation should be compensated by the local government.…”

Section: Discussion and Implications Of Ecological Restorationmentioning

confidence: 99%

Evaluation of land reclamation and implications of ecological restoration for agro-pastoral ecotone: case study of Horqin Left Back Banner in China

Zhou

Zhang

et al. 2017

Chin. Geogr. Sci.

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The agro-pastoral ecotone has been recognized as the main distribution area of reserved land resource for cultivation. Accordingly, clarifying this assumption, as well as concerting land reclamation and ecological restoration, is important to ensure food security and environmental improvement in the agro-pastoral ecotone. We selected Horqin Left Back Banner (HLBB) as the subject of our case study. The landscape ecological security pattern of this area was determined using the minimum cumulative resistance model. Over-cultivation, quantity of reserved land resource for cultivation, and changes in landscape indexes before and after land use adjustment were then analyzed. Over-cultivation is a serious problem in the agro-pastoral ecotone. Reserved land resource for cultivation is less than that considered previously, and the area of reserved land resource for cultivation in HLBB only accounts for 11.50% of total uncultivated land. With regard to changes in landscape indexes, the adjusted land use pattern is effective for anti-desertification. The compensation standard for abandoned cultivated land should be improved and the comprehensive results of 'Grain for Green' should be evaluated to further implement ecological restoration in the agro-pastoral ecotone.

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“…The typical steppe covers more than half of the areas, while forest, shrub, farmland, and others are scattered in the remainder. Desertification has become the most severe issue since the late Holocene for these sandy lands due to the continental climate, sparse vegetation, sandy soils, and lack of water resources [19]. The terrain of the HSDK Desert is less rough and elevations decrease from ca.…”

Section: Location and Landscapementioning

confidence: 99%

Is the Groundwater in the Hunshandake Desert (Northern China) of Fossil or Meteoric Water Origin? Isotopic and Hydrogeochemical Evidence

Zhu

Ren

Rioual

2018

Water

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To gain an insight into the origin of groundwater in the Hunshandake Desert (HSDK), stable and radioactive isotopes and the major ion hydrochemistry of groundwater, as well as other natural waters, were investigated in this desert. The results showed that the groundwaters in the HSDK are freshwater (total dissolved solid (TDS) < 700 mg/L) and are depleted in δ 2 H and δ 18 O when compared with the modern precipitation. The major water types are the Ca-HCO 3 and Ca/Mg-SO 4 waters. No Cl-type and Na-type waters occurred in the study area. The ionic and depleted stable isotopic signals in groundwater, as well as the high values of tritium contents (5-25 TU), indicate that the groundwaters studied here are young but not of fossil and meteoric water origin, i.e., out of control by the modern and palaeo-direct recharge. A clear difference in the isotopic signals are observed between the groundwaters in the north and south parts of the study area, but the signals are similar between the groundwaters in the north HSDK catchment and its neighboring catchment, the Dali Basin. The topographical elevation decreases from the south (1396 m a.s.l.) to the north (1317 m a.s.l.) and the Dali (1226 m a.s.l.). Groundwaters in the north are characterized by lower chloride and TDS concentrations, higher tritium contents, higher deuterium excess, and more depleted values of δ 2 H and δ 18 O than those in the south. The spatial distribution pattern of these environmental parameters indicates a discrepancy between the hydraulic gradient of groundwater and the isotopic and hydrochemical gradients of groundwater in the HSDK, suggesting different recharge sources between the two parts in the desert. A combined analysis using the isotopic and physiochemical data of natural waters collected from the Dali Basin and the surrounding mountains was performed to investigate this problem. It indicates that groundwaters in the HSDK Desert are recharged from remote mountain areas (about 150-200 km to the east and southeast) but not from the north neighboring catchment.

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Effect of agricultural economic growth on sandy desertification in Horqin Sandy Land

Cited by 57 publications

References 61 publications

Spatiotemporal and spectral analysis of sand encroachment dynamics in southern Tunisia

Spatiotemporal and spectral analysis of sand encroachment dynamics in southern Tunisia

Evaluation of land reclamation and implications of ecological restoration for agro-pastoral ecotone: case study of Horqin Left Back Banner in China

Is the Groundwater in the Hunshandake Desert (Northern China) of Fossil or Meteoric Water Origin? Isotopic and Hydrogeochemical Evidence

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