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Characteristics of deep drainage and soil water in the mobile sandy lands of Inner Mongolia, northern China

Journal of Arid Land 2015年第2期7卷 238-250页

作者： Xin Ping LIU Yu Hui HE Xue Yong ZHAO Tong Hui ZHANG La Mei ZHANG Yun Hua MA Shu Xia YAO Shao Kun WANG Shui Lian WEI Naiman Desertification Research Station Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Laboratory of Stress Ecophysiology and Biotechnology Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences

Quantification of deep drainage and the response of soil water content to rainfall patterns are critical for an effective management strategy of soil water conservation and groundwater utilization. However, there has been little information on how rainfall characteristics influence soil water dynamics and deep drainage in mobile sandy lands. We used an underground chamber to examine the responses of deep drainage and soil water content in mobile sandy lands to rainfall characteristics in Inner Mongolia during the growing seasons of 2010, 2011 and 2012. Results showed that rainfall in this area was dominated by small events （〈5 mm）, which increased soil water con- tent in the surface soil layers （0-40 cm）, but did not increase soil water content in the deeper soil layers （greater than 40 cm）. Soil water content at the 0-100 cm depth increased significantly when the total amount of rain was 〉20 mm. Rainfall amount, intensity and the duration of dry intervals were significantly related to the soil water content in different soil layers. deep drainage was significantly correlated with rainfall amount and intensity, but not with the duration of dry intervals. The coefficients of deep drainage in the mobile sandy lands ranged from 61.30% to 67.94% during the growing seasons. Our results suggested that rainfall infiltration in the mobile sandy lands had considerable potential to increase soil water storage while recharging the groundwater in this region.

关键词： mobile sandy lands rainfall characteristics deep drainage soil water content

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Soil water movement and deep drainage through thick vadose zones on the northern slope of the Tianshan Mountain: Croplands *** lands

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China Geology 2020年第1期3卷 113-123页

作者： Fang-qiang Sun Li-he Yin Wu-hui Jia Jun Zhang Xiao-yong Wang Li-feng Zhu Xin-xin Zhang Xiao-ping Tang Jia-qiu Dong Xi’an Center of Geological Survey China Geological SurveyMinistry of Natural ResourcesXi’an 710054China School of Water Resources and Environment China University of GeosciencesBeijing 100083China Chinese Academy of Geological Sciences China Geological SurveyMinistry of Natural ResourcesBeijing 100037China

Regional aridity is increasing under global climate change,and therefore the sustainable use of water resources has drawn attention from scientists and the ***-use changes can have a significant impact on groundwater recharge in arid regions,and quantitative assessment of the impact is key to sustainable groundwater resources *** this study,the changes of groundwater recharge after the conversion of natural lands to croplands were investigated and compared in inland and arid region,i.e.,the northern slope of the Tianshan *** isotopes suggest that soil water in topsoil(<2 m)has experienced stronger evaporation under natural lands than croplands,and then moves downward as a piston *** was estimated by the tracer-based mass balance method,i.e.,chloride and *** rates under natural conditions estimated by the chloride mass balance(CMB)method were estimated to be 0.07 mm/a in deserts and 0.4 mm/a in *** contrast,the estimated groundwater recharge ranged from 61.2 mm/a to 44.8 mm/a in croplands,indicating that groundwater recharge would increase significantly after land changes from natural lands to irrigated croplands in arid *** estimated by the sulfate mass balance method is consistent with that from the CMB method,indicating that sulfate is also a good tracer capable of estimating groundwater recharge.

关键词： Land-use Soil water Groundwater recharge deep drainage Unsaturated zone Arid regions Cropland Natural land Groundwater survey engineering Tianshan Mountain China

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On-farm gains and losses of soil organic carbon in terrestrial hydrological pathways:A review of empirical research

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International Soil and Water Conservation Research 2016年第4期4卷 245-259页

作者： Gunasekhar Nachimuthu Nilantha Hulugalle Department of Primary Industries Australian Cotton Research InstituteNarrabriNSW 2390Australia Fenner School of Environment&Society College of MedicineBiology&EnvironmentAustralian National UniversityCanberra ACT 2601 Australia

Theoretical estimates of soil carbon sequestration in Australian farming systems often do not coincide with measured values of soil carbon,possibly due to post sequestration carbon *** loss through soil erosion is one of several pathways of sequestered carbon loss from agricultural *** details on different loss pathways,especially carbon loss through terrestrial hydrological pathways on a farm scale,are *** this article,we review the Australian and global literature on terrestrial on farm carbon gains and losses in hydrological *** scale,landscape scale and modelling studies are not the focus of this review and are only briefly *** fractions associated with soil erosion and runoff include particulate organic and inorganic carbon,dissolved organic carbon(DOC),dissolved inorganic carbon(DIC),dissolved CO_(2)-C and dissolved *** climatic zones with approximately 500 mm of annual rainfall may receive from 6.4 to 29.5 kg ha^(−1) of DOC in rainfall(with concentration of 1.28-5.9 mg L^(−1) of DOC in rainwater).Carbon addition(net)to a field through irrigation water can range from 4.6 to 30.8 kg ha^(−1).The carbon losses through runoff and erosion may vary from below detection limits to 1072 kg ha^(−1) yr^(−1) and these values are significant proportions of SOC sequestration rates reported in *** carbon enrichment ratios in eroded sediments range from 0.39 to *** organic carbon concentrations in deep drainage below farming lands range from negligible to 90 mg L^(−1).Management practices that may influence soil carbon losses in erosion and runoff include changing land use,tillage,ground cover,farm layout and slope,furrow length and vegetative buffer strips in the tail end of the *** literature surveyed indicated that a large knowledge gap existed in Australia with respect to empirical data on soil carbon lost through erosion and runoff because most studies focussed on nutrients oth

关键词： Runoff Erosion deep drainage Carbon losses Irrigation

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