C I E N C I A - Consejo Superior de Investigaciones Científicas
C I E N C I A - Consejo Superior de Investigaciones Científicas
C I E N C I A - Consejo Superior de Investigaciones Científicas
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C I E N C I A<br />
florísticas, en las otras l¡ localida<strong>de</strong>s sólo se ob<br />
servaron diferencias florísticas.<br />
•I. De las observaciones ecológicas se <strong>de</strong>dujo<br />
qué dos <strong>de</strong> los tipos <strong>de</strong> vegetación: matorral <strong>de</strong><br />
sértico caldcóla y matorral cactus-mezquite, son<br />
exclusivos <strong>de</strong> los sustratos calizo e ígneo respec<br />
tivamente. Se pudo advertir igualmente que las<br />
gran<strong>de</strong>s cactáceas: (Myrtillocactus, Lemaireocc-<br />
reus, Opuntia) están confinadas en la región es<br />
tudiada a suelos situados sobre roca ígnea.<br />
5. Las diferencias florísticas permitieron<br />
formular listas <strong>de</strong> especies caldcólas y calcífugas,<br />
<strong>de</strong>mostrándose la prepon<strong>de</strong>rancia numérica <strong>de</strong><br />
las primeras sobre las segundas.<br />
(i. Como conclusión <strong>de</strong> or<strong>de</strong>n práctico se incluyó<br />
un cuadro <strong>de</strong> especies indicadoras conspicuas<br />
así como una serie <strong>de</strong> observaciones que<br />
servirán para facilitar la i<strong>de</strong>ntificación <strong>de</strong> rocas<br />
cali/as e ígneas a base <strong>de</strong> la vegetación.<br />
SUMMARY<br />
1. Fourteen localities, in which limestone<br />
and igneous hills are situated close to one another,<br />
were chosen in the south-western and central<br />
part of the Mexican state of San Luis<br />
Potosí, in an attempt to study floristic and ecological<br />
differences between the vegetation of<br />
both kinds of hills.<br />
2. Floristic censuses and brief ecological surveys<br />
on both fa<strong>de</strong>s of each locality were realized.<br />
5. Fight of the fourteen localities showed<br />
differences in vegetation? types as well as floristic<br />
differences, in the resting six localities only floristic<br />
differences were observed.<br />
1. Ecological data indicate the fact that of<br />
the two vegetation types, namely: <strong>de</strong>sert caldcóle<br />
scrub and cactus-mezquite scrub, the first <strong>de</strong>velops<br />
exclusively on limestone and the second<br />
one on igneous substratum. It can also be observed<br />
that the large cacti (Myrtillocactus, Lemaireocereus,<br />
Opuntia) are confined in the area to<br />
soils on igneous rock.<br />
5. F'loristic differences allowed the elaboration<br />
of lists of caldcóle and calcifuge species,<br />
the first ones being much more abundant.<br />
6. Conspicous plant indicators are resumed<br />
in the form of a table and a few observations<br />
are inclu<strong>de</strong>d with the aim of enabling the i<strong>de</strong>ntification<br />
of limestone and igneous rocks by<br />
means of vegetation.<br />
[. RZKDOWSKI<br />
Laboratorio <strong>de</strong> Botánica,<br />
Instituto <strong>de</strong> Investigación <strong>de</strong> Zonas Desérticas.<br />
Universidad Aut. <strong>de</strong> San Luis Potos!, S. L. P.<br />
158<br />
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