Carbon sequestration in soils of central Asia

Lal, Rattan

doi:10.1002/ldr.624

Cited by 76 publications

(42 citation statements)

References 38 publications

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“…Additional problems related to drought stress are low soil organic carbon concentration (SOC), low aggregation, susceptibility to compaction, salinization, and accelerated soil erosion in dry regions. The attendant soil degradation and desertification lead to depletion of SOC, a decline in biomass production, eutrophication/pollution of waters and emission of greenhouse gases (Lal 2004).…”

Section: Introductionmentioning

confidence: 99%

“…Fluctuations in the water levels of saline waters cause obvious changes in chemical concentrations and might reflect regional climatic shifts (Williams 1998). The consequences of climate change in the central Asian region (Lioubimtsevaa et al 2005) may cause a predictable salinity increase in inland waters; however, in contrast with soil researches (Lal 2004), there are much less data on salinization and chemical changes of the saline lakes in the region.…”

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confidence: 99%

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Chemical composition and trophic state of shallow saline steppe lakes in central Asia (North Kazakhstan)

Boros

Jurecska

Tatár

et al. 2017

Environ Monit Assess

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The purpose of this study was to identify the prevailing chemical composition and trophic state of the shallow saline steppe lakes of North Kazakhstan along a wide size range (<1−454 km 2 ) and salinity gradient (2−322 g L −1 ) on a large spatial scale (1000 km), taking into account the potential effects of human disturbances. Water depth, Secchi disc transparency, temperature, pH, electric conductivity, major ions, total dissolved solids, total organic carbon, total nitrogen and phosphorus, nitrate, soluble reactive phosphorus and chlorophyll a were measured. The equivalent percentage of major ions, Spearman rank correlation, multivariate analyses, equilibrium state of lakes and spatial GIS autocorrelation were calculated. The impact of human disturbances (settlements, farms and mines) on total organic carbon, nitrogen, phosphorus, and chlorophyll a were tested by Kruskal-Wallis ANOVA.The most common combinations of dominant ions were Na-Cl>SO4 and Na-Cl (n=16; 64%), the Ca, Mg, HCO3, and SO4 ions precipitate with increasing salinity (2−322 g L −1 ), and ion composition shifts from Na>Mg-Cl>SO4, to Na-Cl. The most of the chemical variables positively, but chlorophyll a negatively correlated with total dissolved solids, and the total phosphorus had no significant correlation with any variables. The trophic state of these lakes in most cases exceeded the hypertrophic level. The increase in salinity causes change in chemical composition and effects on the phytoplankton development independently from the size of water surface, and the human disturbances had negligible effect on the trophic state of shallow saline lakes in this region of Kazakhstan.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Chemical composition and trophic state of shallow saline steppe lakes in central Asia (North Kazakhstan)

Boros

Jurecska

Tatár

et al. 2017

Environ Monit Assess

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“…The grassland of Kazakhstan represents one of the world's hugest carbon pools [27][28][29]. Evaluation of the existing global LAI products in Kazakhstan's biomes and generation of new national and regional LAI products is of great importance with respect to the recent efforts towards mapping carbon sequestration in grasslands of Kazakhstan [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Retrieval of Coarse-Resolution Leaf Area Index over the Republic of Kazakhstan Using NOAA AVHRR Satellite Data and Ground Measurements

Propastin

Kappas

2012

Remote Sensing

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Abstract:A new multi-decade national-wide coarse-resolution data set of leaf area index (LAI) over the Republic of Kazakhstan has been developed based on data from the Advanced Very High Resolution Radiometer (AVHRR) and in situ measurements of vegetation structure. The Kazakhstan-wide LAI product has been retrieved using an algorithm based on a physical radiative transfer model establishing a relationship between LAI and given patterns of surface reflectance, view-illumination conditions and optical properties of vegetation at the per-pixel scale. The results revealed high consistencies between the produced AVHRR LAI data set and ground truth information and the 30-m resolution Landsat ETM+ LAI estimated using the similar algorithm. Differences in LAI between the AVHRR-based product and the Landsat ETM+-based product are lower than 0.4 LAI units in terms of RMSE. The produced Kazakhstan-wide LAI was also compared with the global 8-km AVHRR LAI (LAI_PAL_BU_V3) and 1-km MODIS LAI (MOD15A2 LAI) products. Results show remarkable consistency of the spatial distribution and temporal dynamics between the new LAI product and both examined global LAI products. However, the results also revealed several discrepancies in LAI estimates when comparing the global and the Kazakhstan-wide products. The discrepancies in LAI estimates were outlined and discussed.

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“…Moreover, it is a region that has witnessed some major environmental catastrophes and degradation of its land resources 2,7 . Kazakhstan accounts for around 90% of the total wheat production area in Central Asia 6 , making it one of the most important regions for global food production.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Spatial and Temporal Variation of Soil Organic Carbon Budget in Northern Kazakhstan

Takata

2010

JARQ

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Farm-regional evaluation of soil organic carbon (SOC) dynamics for the chernozem zone in northern Kazakhstan is now vitally important for making agro-environmental policy. In this study, the author intends to evaluate spatial and temporal variation of the SOC budget and to seek alternative ways of sustainable land use in northern Kazakhstan. To achieve this final goal, this study established the following objectives: to (1) clarify the spatial patterns of soil organic matter content, (2) clarify the influence of land use on the dynamics of soil organic carbon in situ for the three differential soil classes, and (3) clarify spatial and temporal variability of SOC budget in farm-regional scale. The highest SOC content was found in the northern region and the lowest content in the southern region of the study area. Potentially mineralizable carbon (PMC) content, however, was highest in the midwestern region. Furthermore, fluctuations in CO 2 emission from the soils showed a similar pattern to temperature fluctuations. Using PMC, soil temperature, precipitation and/or dryness factor, 40-80% of the variation of CO 2 emission could be estimated. From farm-regional evaluation, it is concluded that the spatial and temporal variation of the SOC budget was significantly affected by the crop rotation system in the area. In addition, the fallow-and barley-based crop rotation systems accelerate SOC depletion in the study area.

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Carbon sequestration in soils of central Asia

Cited by 76 publications

References 38 publications

Chemical composition and trophic state of shallow saline steppe lakes in central Asia (North Kazakhstan)

Chemical composition and trophic state of shallow saline steppe lakes in central Asia (North Kazakhstan)

Retrieval of Coarse-Resolution Leaf Area Index over the Republic of Kazakhstan Using NOAA AVHRR Satellite Data and Ground Measurements

Analysis of Spatial and Temporal Variation of Soil Organic Carbon Budget in Northern Kazakhstan

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