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　　如何认定国际热点论文

　　Zhengyf

　　最近因研究生开题的原因，进行有关文献检索，发现了一个问题，感到不解，
特在这里指出来，请知者解惑。

　　邵明安教授（现任西北农林科技大学资环学院院长）2000年在SSSAJ上发表
了一篇论文（M Shao, R Horton, 2000. Exact solution for horizontal 
water redistribution by general similarity，Soil Science Society of 
America Journal，64 (2): 561-564）。邵教授在多份材料里提到（参见网上资
料http://www.nsfc.gov.cn/nsfc/cen/00/kxb/dq/rcpy/200006_shaomingan.htm；
http://cyc7.cycnet.com:8090/fair/bolanhui/person/person_content.jsp?p_
id=1747&a_id=127），该论文(以下简称邵文)是2000-2001年国际环境/生态学领
域20篇热点论文之一，且是我国唯一入选的一篇论文。

　　笔者由“ISI Web of Knowledge”检索知，迄今为止，邵文共被引用5次，
引用情况如下：

　　1. Deinert MR, Parlange JY, Steenhuis T, et al. Measurement of 
fluid contents and wetting front profiles by real-time neutron 
radiography ，JOURNAL OF HYDROLOGY 290 (3-4): 192-201 MAY 25 2004 

　　2. Parlange JY, Lockington D, Sander G, et al. Comments on "Exact 
solution for horizontal redistribution by general similarity" SOIL 
SCIENCE SOCIETY OF AMERICA JOURNAL 65 (3): 957-958 MAY-JUN 2001 

　　3．Shao M, Horton R. Response to "Comments on 'Exact solution for 
horizontal redistribution by general similarity' by Parlange et al." , 
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL 65 (3): 958-959 MAY-JUN 2001

　　4．Youngs EG, Comments on "Exact solution for horizontal water 
redistributions by general similarity" , SOIL SCIENCE SOCIETY OF 
AMERICA JOURNAL 65 (3): 959-960 MAY-JUN 2001

　　5．Shao M, Horton R, Response to "Comments on an 'Exact solution 
for horizontal redistribution by general similarity'" , SOIL SCIENCE 
SOCIETY OF AMERICA JOURNAL 65 (3): 960-961 MAY-JUN 2001

　　其中除为他人引用1篇外，另外为他人的2篇评述与邵本人的2篇答复。E.G. 
Youngs 的评述认为邵文考虑不全面，否定的成分居多，其评述全文如下：

　　Comments on "Exact Solution for Horizontal Water Redistributions 
by General Similarity" 

　　E.G. Youngs 

　　One of the basic facts of soil water physics is the hysteresis 
exhibited in soil water relationships, particularly in the 
relationship between soil water content and soil water pressures 
(Haines, 1930). However, although this hysteresis has a profound 
effect on the distribution and movement of water in soils (for example, 
it plays an important role in retaining infiltration water near the 
soil surface, impeding downwards movement), it is given scant 
attention in soil hydrology. The redistribution of soil water after 
infiltration is the classic example usually cited for hysteretic soil 
water behavior (Childs, 1969). The note by Shao and Horton (2000) is 
therefore misleading by ignoring hysteresis in purporting to calculate 
redistribution profiles in soils. The authors seem to have been 
inspired by Philip's (1991) analysis of horizontal soil water 
redistribution from one infinitely long wet column into another 
infinitely long dry column. This was essentially a consideration of 
the behavior in a composite porous body consisting of two 
semi-infinite columns of a soil with different hydraulic properties 
and so did not address the true complex hysteretic behavior in soils 
where different parts of the soil profile are wetting and draining 
down different scanning curves of the soil water characteristic. 

　　Horizontal redistribution soil water profiles after infiltration 
were presented by Youngs (1958a). He argued that the soil water 
diffusivity given by the product of the hydraulic conductivity and the 
slope of the moisture characteristic that was introduced by Childs and 
Collis-George (1950) in order to put Richards' equation in the form of 
a more easily solved nonlinear diffusion equation could not be used to 
analyze the soil water redistribution in such hysteretic situations. 
The change in slope of the moisture characteristic at a reversal gave 
a discontinuity in the diffisivity, so the mathematical convenience of 
introducing the soil water diffusivity is not achieved. 

　　The experimental redistribution profiles presented by Youngs (1958a) 
showed the importance of hysteisis in their development. The case of 
the profile development after vertical infiltration is further 
complicated by the effect of gravity (Youngs, 1958b). In this case, it 
has been found that two different forms of profile development are 
possible, depending on the depth of infiltration and also on the 
texture of the soil. In one the profiles maintain approximately the 
general shape of the infiltration profile, whereas in the other 
desaturation at the surface occurs with a step-like advance of the 
wetting front below. The discussion has been further developed by 
Youngs and Poulovassikis (1976) and Youngs (1983)(1990). 

　　Shao and Horton (2000) do not consider the situation of the  
redistribution of an initial infiltration profile but instead that of 
a given initial hypothetical region of uniform saturation. Even in 
this simpler case, hysteresis cannot be ignored. Thus it must be 
concluded that the analysis given in this paper is of little relevance 
to soil water redistribution but could be of interest in analyzing 
other processes described by a nonlinear diffusion equation. 

　　Received for publication July 25, 2000. 

　　笔者的问题是，如此引用情况，如何认为邵文是2000-2001年国际环境/生态
学领域20篇热点论文之一？进而一个更泛广的问题是“如何认定国际热点论文？”

(XYS20051110)

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