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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 | The role of chondrocyte senescence in osteoarthritis显示文摘 | Price JS Water JG Darrah C | 2002 | Aging Cell2002，1，1： | 1 |
| 3 | Effects of estradiol on substrate turnover during exercise in amenorrheic females显示文摘 | Ruby B C Robergs R A Waters D L | 1997 | Med Sci Sports Exerc1997，29，9： | 1 |
| 4 | A conformationally sensitive GHR antibody : impact on GH signaling and GHR proteolysis显示文摘 | Jiang J Wang X He K Li X Chen C M Sayeski P P Waters M J Frank S J | 2004 | Mol Endocrinol2004，18，12： | 1 |
| 5 | QF-PCR as a stand-alone test for prenatal samples: the first 2 years' experience in the Lon- don region显示文摘 | Hills A Donaghue C Waters J | 2010 | Prenat Diagn2010，30，6： | 1 |
| 6 | Echinoderm faunas of the Hon-gguleleng Formation,Late Devonian(Famennian),Xinjiang-uygur Autonomous Region,People's Republic of China显示文摘 | Lane N G Waters J A Maples C G | 1997 | The Paleonto-logical Society Memoir1997，47，： | 1 |
| 7 | Struc-ture of the C-terminal MA-3domain of the tumor sup-pressor protein PDCD4and characterization of its in-teraction with eIF4A显示文摘 | WATERS L C VEVERKA V BOHM M | 2007 | Oncogene2007，26，： | 1 |
| 8 | lmmunoreactivity of organic mimeutupes of the En Component of pyruvate dehydrogenates connecting xenobiutics with primary biliary cirrhosis显示文摘 | Long S A Quan C Van De Water J | 2001 | lm munol2001，167，： | 1 |
| 9 | A quadrupling of Famen-man pelmatozoan diversity:new late Devonian blastoids and crinoids from northwest China显示文摘 | Waters J A Maples C G Lane N G | 2003 | Journal of Paleontology2003，77，5： | 1 |
| 10 | Extranuclear es- trogen receptor beta immunoreactivity is on doublecortin-con- taining cells in the adult and neonatal rat dentate gyms显示文摘 | Herriek S P Waters E M Drake C T | 2006 | Brain Res2006，1121，1： | 1 |
| 11 | Nickel-base alloy with improved strength at 2000 to 2200 F显示文摘 | FRECHE J C | 1970 | Met Eng Quart1970，10，2： | 1 |
| 12 | Some optimal dividend prob- lems 显示文摘 | Dickson D C M Waters H R | 2004 | Astin Bulletin2004，34，1： | 1 |
| 13 | Serum urate as an independent predictor of poor outcome and future vascular events after acute stroke显示文摘 | Weir C J Mair S W Waters M R | 2003 | Stroke2003，34，8： | 1 |
| 14 | Mechanical strain inhibits repair of airway epithelium in vitro显示文摘 | Savla U Waters C M | 1998 | Am J Physiol1998，274，61： | 1 |
| 15 | PAHdb:a locus-specific knowledge base显示文摘 | Scriver CR Waters PJ Sarkissian C | 2000 | Hum Mutat2000，15，： | 1 |
| 16 | Neutrophil proteas inhibition reduces neuromyelitis optica-immunoglobulin G-induced damage in mouse brain显示文摘 | Saadoun S Waters P MacDonald C | 2012 | Ann Neurol2012，71，3： | 1 |
| 17 | Producing gas from its source 显示文摘 | Boyer C Kieschnick J Lewis RE Waters G | 2006 | Oilfield Review2006，18，： | 1 |
| 18 | Growth hormone receptor and serum binding protein : purification, cloning and expression 显示文摘 | Leung D W Spencer S A Cachianes G Hammonds R G Collins C Henzel W J Bamant R Waters M J Wood W I | 1987 | Nature1987，330，： | 1 |
| 19 | Some optimal dividends problems显示文摘 | Dickson D C M Waters H | 2004 | ASTIN Bulletin2004，34，1： | 1 |
| 20 | Comparison of effective- ness of atorvastatin 10 mg versus 80 mg in reducing major cardiovascular events and repeat revaseularization in patients with previous pereutane- ous coronary intervention ( posthoc analysis of the Treating to New Tar- gets Study) 显示文摘 | Johnson C Waters DD DeMicco DA | 2008 | Am J Cardiol2008，102，10： | 1 |
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