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| 1 | Critical slope gradient for compulsory abandonment of farmland on the hilly Loess Plateau显示文摘Scientific evidence for the upper limit of farmland is proposed. Shallow gully erosion is one of erosion types distributed extensively on sloping farmland in the hilly regions of the Loess Plateau. Field observation and aerial photos interpretation, as well as laboratory experiments show that the shallow gully erosion occurring on the steeper farmland in the hilly regions of the Loess Plateau is an important factor leading to intensive erosion on slope, because of its extensive distribution and intensive runoff collection. The data on the formation, development and distribution of shallow gullies on sloping farmland indicate that critical slope gradient for shallow gully initiation ranges from 15 to 20 degrees with an average of 18.2 degrees. Therefore, it is suggested that critical slope gradient for compulsory abandonment of farmland on the hilly Loess Plateau should be kept within the critical slope gradient for shallow gully initiation to prevent shallow gully formation in order to control soil loss more effectively. But as the first step, the cultivation on the slopes with slope larger than 25 degrees where the maximum erosion occurs should be strictly forbidden. | TANG Keli+1, ZHANG Keli 1,2 and LEI Aling 1,3 1. Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling 712100, China 2. Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China 3. Water Resources C | 1998 | Chinese Science Bulletin1998，43，5： | 16 |
| 2 | Feasibility and logistics ofMRI before thrombolytic treatment显示文摘 | Soiling C Ashkanian M Hjort N | 2009 | Acta Neurol Scand2009，120，3： | 1 |
| 3 | Revised slope loss equation 显示文摘 | McCool D steepness K Brown factor for Transactions of the Biological Engineers L C Foster G R the universal soil American Society | 1987 | of Agricultural and1987，30，5： | 1 |
| 4 | plantations in the Horqin sandy land of Northeast China显示文摘 | Cao C Y Jiang D M Teng X H et ah Soil chemical and microbiological properties along a chronosequence o{ Caragana microphylla Lain | 2008 | Applied Soil Ecolo- gy2008，40，1： | 1 |
| 5 | Distribution of heavymetals in plants cultivated with wastewater irrigated soils during different periods of time 显示文摘 | Soil S C Andradee Mirelesa | 2005 | Nuclear Instruments and Methods in Physics Research2005，241，： | 1 |
| 6 | Case report: patient withneedle phobia for caesarean section - not quite as in a textbook显示文摘 | Hillermann T Breitenstein C Soil C | 2015 | Anasthesiol Intensivmed Notfallmed Schmerzther2015，50，06： | 1 |
| 7 | detergent formation and performance显示文摘 | TONGCUMPOU C ACOSTA Microemulsion formation and E J QUENCER L B etal detergency with oily soil Ⅱ | 2003 | Journal of Surfactant and Detergent2003，6，3： | 1 |
| 8 | Protective effect of T-type calcium- channel blocker flunarizine on cisplatin-induced death of audito- ryeells 显示文摘 | SoilS Park C KimHJ | 2005 | Hear Res2005，204，12： | 1 |
| 9 | Role of serotonin in the hepato- gastrointestinal tract : an old molecule for new perspectives 显示文摘 | Lesurtel M Soil C Graf R | 2008 | Cell Mol Life Sci2008，65，6： | 1 |
| 10 | Dynamics of crop yields and carbon in a long-term fertilization the Huang-Huai-Hai Plain of China 显示文摘 | Cai Z C @in soil organic experiment in S W | 2006 | Geoderma2006，136，： | 1 |
| 11 | Kurstaki en- dotoxin显示文摘 | Donegan K K Palm C J Fieland V J Changes in levels spe- cies and DNA fingerprints of soil microorganisms associated with cotton expressing the Bacillus thuringiensis vat | 1995 | Applied Soil Ecology1995，2，2： | 1 |
| 12 | 显示文摘 | Morera MT Echeverrfa JC Mazkiarn C et aL Isotherms and sequential extraction procedures for evaluating sorption and distribution of heavy metals in soils | 2001 | Environmental Pol- lution2001，113，2： | 1 |
| 13 | The renal handling of amylase in normal man显示文摘 | Soiling K Mogensen C E Vittinghus E | 1979 | Nephron1979，23，6： | 1 |
| 14 | Erythropoietin administra- tion is associated with short-term improvement in glomerular filtra- tion rate after ischemia-reperfusion injury 显示文摘 | Soiling C Christensen AT Kraq S | 2011 | Acta Anaesthesiol Scand2011，55，2： | 1 |
| 15 | Ca3 fingerprinting of Candida albicans bloodstream isolates from the United States, Canada, South America, and Europe reveals a European clade 显示文摘 | Pujol C Pfaller M Soil D R | 2002 | J Clin Microbiol2002，40，8： | 1 |
| 16 | Frequent expression of the novel cancer testis antigen MAGE-C2/CT-IO in hepatocellular carcinoma 显示文摘 | Riener MO Wild PJ Soil C | 2009 | Int J Cancer2009，124，2： | 1 |
| 17 | MRI detection of early blood-brain barrier disruption:parenehymal enhancement predicts focal hemorrhagic transformation after thrombolysis显示文摘 | Hjort N Wu O Ashkanian M Soiling C Mouridsen K Christensen S | 2008 | Stroke2008，39，： | 1 |
| 18 | I: basic model and its application 显示文摘 | Zienkiewicz O C Leung K H Pastor M Simple model for transient soil loading in earthquake analysis | 1985 | International Journal for Numerical and Analytical Methods in Geomechanics1985，，9： | 1 |
| 19 | Calcium regulation of chloroplastprotein import显示文摘 | Chigri F Soil J Vothknecht U C | 2005 | Plant Journal2005，42，6： | 1 |
| 20 | A microwell cytotoxicity assay using Artemia salina (brine shrimp) 显示文摘 | SOILS P N WRIGHT C W ANDERSON M M | 1993 | Planta Med1993，59，3： | 1 |
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