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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 | RILL EROSION PROCESS ON STEEP SLOPE LAND OF THE LOESS PLATEAU显示文摘Rill erosion processes and principle of preventing rill erosion of different applied measures are studied by rainfall simulation and field investigation. Research results show that rill erosion processes can be schematically divided into five stages, that is, concentrated flow forming process; little waterfalls in the concentrated flow forming Process; little waterfalls developing into rill head cut process; rill head cuts developing to form discontinuous rill process and discontinuous rills connecting to form continuous rill process. Rill head cuts backward erosion, rill wall collapsing and runoff washing rill bed are the main patterns of rill development. The relevant equation between critical runoff volume of occurring rill erosion and slope degree can be expressed as follows: Q = 76. 10 - 2. 10J. And relevant equation between critical slope length of occurrence Of rill erosion and slope degree is parabolic with a minimum-value. In addition, influence of rill erosion development on slope runoff and soil erosion, benefits and principle of reducing rill erosion amount of mulch, non-tillage system and remained residue, strip alternation of grass and crop, horizontal ditch are also studied. | ZHENG Fenli and TANG Keli (1 The English text has been altered and edited by Dr. DING Lianzhen 2 Engineer, National Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau, Chinese Academy of Sciences and institute of Soil and Water Conservati | 1997 | International Journal of Sediment Research1997，12，1： | 9 |
| 3 | Risk factors for pertussis among children hospitalized for pertussis during 2016-2017, in Guizhou Province of China: a case-control study显示文摘Aim:Pertussis is a respiratory tract infection,the vaccine for which was introduced in the Expanded Programme on Immunization(EPI)in Guizhou Province of China(hereafter referred as Guizhou)in the 1980s.This vaccine rapidly decreased incidence rates of pertussis in the province,however,despite the wide high coverage of the diphtheria,tetanus and acellular pertussis(DTaP)combined vaccine,there has been a resurgence of pertussis since 2014.Even with this recent increase in disease transmission,risk factors for pertussis infection have not been evaluated in Guizhou.We aimed to provide information on pertussis risk factors and insight on designing targeted pertussis control policies and measures through this study.Methods:A 1:2 matched retrospective case-control study was conducted between 2016 and 2017,involving infants and children younger than 6 years old and parents of the participants.The enrolled cases included clinical and laboratory confirmed pertussis cases according to the WHO-recommended pertussis definition.Controls were selected from children in the same neighborhood who were not diagnosed with pertussis prior to our investigation and did not exhibit any clinical manifestations of pertussis.Results:The household size[Matched odds ratio(OR_(m)=1.4,95%confidence interval(Cl):1.1-1.7]and household members with antecedent cough(OR_(m)=3.6,95%CI:1.8-7.2)were significantly associated with their child’s pertussis onset.The parents’occupations were significantly associated with their child’s pertussis onset(ORm=9.4,95%CI:1.6-54.8,for mother side;ORm=4.5,95%CI:1.2-16.5,for father side),when they worked in the business and/or service industry.Having family members with a history of cough was an independent risk factor for pertussis[Adjusted odds ratio(AOR)=43.6,95%CI:2.7-694.0].Besides,the parents’demographic characteristics and DTaP doses were not found to be independent factors.Conclusion:Household exposure is an important risk factor for pertussis infection in infants and young children and should therefore be considered as a major factor during formulation of pertussis control policies and measures. | Feng Jiang Keli Li Guangpeng Tang Yan Huang | 2021 | Global Health Journal2021，5，2： | 3 |
| 4 | Rational design of a visible-light photochromic diarylethene:a simple strategy by extending conjugation with electron donating groups显示文摘Photochromic diarylethenes have been widely used in many fields. However, their cyclization process must be induced by UV light. In this article, a simple strategy is developed by extending π-conjugation with electron donating groups. The modified dirylethene derivative can photocyclolize under 405-nm light with a good photochromic efficiency. Meanwhile, its absorption and moderate fluorescence can be switched effectively in both directions by visible lights(405 and 520 nm, respectively) in different solutions and in living cells. We believe that this simple method will become a versatile strategy for developing various dirylethylenes with visible-light photochromism. | Shanliang Tang Fengling Song Meiheng Lu Keli Han Xiaojun Peng | 2019 | Science China Chemistry2019，62，4： | 2 |
| 5 | Heavy mineral record of the Holocene environment on the Loess Plateau in China and its pedogenetic significance显示文摘 | He Xiubin Tang Keli Lei Xiangyi | 1997 | Catena(Giessen)1997，29，34： | 1 |
| 6 | Soil erosion response to climatic change and human activity during the Quaternary on the Loess Plateau, China显示文摘 | Xiubin He Jie Zhou Xinbao Zhang Keli Tang | 2006 | Regional Environmental Change (-)2006，，1： | 1 |
| 7 | Yellow River sediment response to human disturbance in the last century 显示文摘 | He Xiubin Zhou Jie Tang Keli | 2005 | River Basin Management III2005，83，58： | 1 |
| 8 | RELATIONSHIP OF ECO-ENVIONMENTAL CHANGE WITH NATURAL EROSION AND ARTIFICIALLY ACCELERATED EROSION显示文摘The natural landscape of the Loess Plateau was changed by severe soil erosion. The Ziwuling forest area provides research base for tracing back eco environmental change related to natural erosion and artificially accelerated erosion. Using methods of typical region investigations, in situ experimental study and chemical analysis of samples, impact of vegetation destruction and rehabilitation on soil erosion, characteristics of natutal erosion under conditions of natural ecological balance and artificially accelerated erosion resulting from vegetation destruction in forest area, and the processes of artificially accelerated erosion and soil degradation have been analyzed and discussed. | Zheng Feili Tang Keli Zhang Keli Cha Xuan Bai Hongying Northwest Institute of Soil and Water Conservation, CAS and Ministry of Water Resources, Yangling, Shaanxi 712100 People’s Republic of China | 1997 | Journal of Geographical Sciences1997，7，2： | 1 |
| 9 | Effects of sediment size on transport capacity of overland flow on steep slopes显示文摘 | Zhang Guanghui Wang Lili Tang Keli | 2011 | Hydrological Sciences Journal2011，56，7： | 1 |
| 10 | Approach to the genesis and development of rill erosion on slope land and the way to control it显示文摘 | Zheng Fengli Tang Keli and Zhou Peihua | 1987 | Acta Conservationis Soli et Aquae Sinica1987，1，： | 1 |
| 11 | Decoupling soil erosion and human activities on the Chinese Loess Plateau in the 20th century显示文摘 | Jie Wei Jie Zhou Junliang Tian Xiubin He Keli Tang | 2006 | Catena2006，，1： | 1 |
| 12 | A Highly Selective and Sensitive Fluorescent Probe Recognition for Co^2+ in Aqueous Media Based on 8-Hydroxyquinolin-2- carbaldehyde-2-pyridylformylhydrazone Derivative显示文摘 | Keli Zhong Jie Zhao Xue Zhou Shuhua Hou Yanjiang Bian Jianrong Li Lijun Tang | 2016 | Chinese Journal of Chemistry2016，34，12： | 0 |
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