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| 1 | ^137Cs tracing dynamics of soil erosion,organic carbon,and total nitrogen in terraced fields and forestland in the Middle Mountains of Nepal显示文摘The Middle Mountains is one of the regions of Nepal most vulnerable to water erosion, where fragile geology, steep topography, anomalous climatic conditions, and intensive human activity have resulted in serious soil erosion and enhanced land degradation. Based on the 137 Cs tracing method, spatial variations in soil erosion, organic carbon, and total nitrogen(TN) in terraced fields lacking field banks and forestland were determined. Soil samples were collected at approximately 5 m and 20 m intervals along terraced field series and forestland transects respectively. Mean 137 Cs inventories of the four soil cores from the reference site was estimated at 574.33 ± 126.22 Bq m-2(1 Bq(i.e., one Becquerel) is equal to 1 disintegration per second(1 dps)). For each terrace, the 137 Cs inventory generally increased fromupper to lower slope positions, accompanied by a decrease in the soil erosion rate. Along the entire terraced toposequence, 137 Cs data showed that abrupt changes in soil erosion rates could occur between the lower part of the upper terrace and the upper part of the immediate terrace within a small distance. This result indicated that tillage erosion is also a dominant erosion type in the sloping farmland of this area. At the same time, we observed a fluctuant decrease in soil erosion rates for the whole terraced toposequence as well as a net deposition at the toe terrace. Although steep terraces(lacking banks and hedgerows) to some extent could act to limit soil sediment accumulation in catchments, soil erosion in the terraced field was determined to be serious. For forestland, with the exception of serious soil erosion that had taken place at the top of slopes due to concentrated flows from a country road situated above the forestland site, spatialvariation in soil erosion was similar to the 'standard' water erosion model. Soil organic carbon(SOC) and TN inventories showed similar spatial patterns to the 137 Cs inventory for both toposequences investigated. However, due to the different dominant erosion processes between the two, we found similar patterns between the <0.002 mm soil particle size fraction(clay sized) and 137 Cs inventories in terraced fields, while different patterns could be found between 137 Cs inventories and the <0.002 mm soil particle size fraction in the forestland site. Such results confirm that 137 Cs can successfully trace soil erosion, SOC and soil nitrogen dynamics in steep terraced fields and forestland in the Middle Mountains of Nepal. | SU Zheng-an XIONG Dong-hong DENG Wei DONG Yi-fan MA Jing PADMA C Poudel GURUNG B Sher | 2016 | Journal of Mountain Science2016，13，10： | 4 |
| 2 | The role of dendritic cells in the induction and regulation of immunity to microbial infection显示文摘 | Reis e Sousa C Sher A Kaye P | 1999 | Curr Opin Immunol1999，11，： | 1 |
| 3 | Electrical stimulation of mammalian retinal ganglion cells with multielectrode arrays显示文摘 | Sekirnjak C Hottowy P Sher A | 2006 | J Neurophysiol2006，95，6： | 1 |
| 4 | In vitro sperm capaeita- tion and transeervical intrauterine insemination for the treatment of refractory infertility: phase I 显示文摘 | Sher G Knutzen VK Stratton C J | 1984 | Fertil Steril1984，41，2： | 1 |
| 5 | High-resolution electrical stimulation of primate retina for epiretinal implant design显示文摘 | Sekirnjak C Hottowy P Sher A | 2008 | J Neurosci2008，28，17： | 1 |
| 6 | Prognosis of non-small cell lung cancer patients by detecting circulating cancer cells in the peripheral blood with multiple marker genes显示文摘 | Sher Y P Shih J Y Yang P C | 2005 | Clinical Cancer Research2005，11，： | 1 |
| 7 | The role of dendritic cells in the induction and regulation of immunity to microbial infection显示文摘 | Reis e Sousa C Sher A Kaye P | 1999 | Curr Opin Immunol1999，11，4： | 1 |
| 8 | Heavy drinking across transition to college: predicting first-semester heavy drinking from prec- ollege variables 显示文摘 | SHER J K RUTLEDGE P C | 2007 | Addictive Behaviors2007，32，4： | 1 |
| 9 | The role of dendritic cells in the induction and regulation of immunity to microbial infection显示文摘 | Reise Sousa C Sher A Kaye P | | Curr Opin Immunol0，11，： | 1 |
| 10 | Information technology as a facilitator for enhancing dynamic capabilities through knowledge management 显示文摘 | Sher P J Lee V C | 2004 | Information & Management2004，41，8： | 1 |
| 11 | Measurement and analysis of vehiclevibration for delivering packages in small-sized and medium-sizedtrucks and automobiles 显示文摘 | Vanee C Sher P S Jay J S | 2012 | Packaging Technology and Science2012，25，： | 1 |
| 12 | Measurement and analysis of truck andrail vibration levels in Thailand 显示文摘 | Vanee C Sher P S Jay J S | 2010 | Packaging Technology andScience2010，23，： | 1 |
| 13 | Mock embryo transfer in early luteal phase, the cycle before in vitro fertilization and embryotransfer: a descriptive study显示文摘 | Knutzen V Stratton C J Sher G | 1992 | Fertil Steril1992，57，1： | 1 |
| 14 | TLR9 regulates Thl responses and cooperates with TLR2 in mediating optimal resistance to Mycobacterium tuberculosis 显示文摘 | Bafica A Scanga CA Feng CG Leifer C Cheever A Sher A | 2005 | J ExpMed2005，202，12： | 1 |
| 15 | Integrating technology readiness into technology acceptance: the TRAM model 显示文摘 | LIN C H SHIH H Y SHER P J | 2007 | Psychology & Marketing2007，24，7： | 1 |
| 16 | Information Technology as a Facilitator for Enhancing Dynamic Capabilities Through Knowledge Management 显示文摘 | Sher P J Lee V C | 2004 | Information & Management2004，41，： | 1 |
| 17 | De novo occurrence of novel SPG3A/atlastin mutation presenting as cerebral palsy显示文摘 | Rainier S Sher C Reish O | 2006 | Arch Neurol2006，63，3： | 1 |
| 18 | The role of dendritic cells in the induction and regulation of immunity to microbial infection显示文摘 | Reis e Sousa C Sher A Kaye P | 1999 | Curr Opin immunol1999，11，4： | 1 |
| 19 | p47 GTPases : regulators of immunity to intracellular pathogens 显示文摘 | Taylor G A Feng C G Sher A | 2004 | Nat Rev Immunol2004，4，2： | 1 |
| 20 | Induction and regulation of IL- 12-dependent host resistance to Toxoplasma gondii 显示文摘 | Sher A Cnllazzo C Scanga C | 2003 | Immunol Res2003，27，23： | 1 |
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