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Pinos San Pedro-Preliminares.P652 04/02/2005, 05:04 P.M Pinos San Pedro-Preliminares.p652 04/02/2005, 05:04 p.m. EL BOSQUE DE CONÍFERAS DE LA SIERRA DE SAN PEDRO MÁRTIR, BAJA CALIFORNIA, MÉXICO Pinos San Pedro-Preliminares.p653 04/02/2005, 05:04 p.m. Pinos San Pedro-Preliminares.p654 04/02/2005, 05:04 p.m. EL BOSQUE DE CONÍFERAS DE LA SIERRA DE SAN PEDRO MÁRTIR, BAJA CALIFORNIA, MÉXICO José Delgadillo Rodríguez Secretaría de Medio Ambiente y Recursos Naturales Instituto Nacional de Ecología Pinos San Pedro-Preliminares.p655 04/02/2005, 05:04 p.m. Pinos San Pedro-Preliminares.p656 04/02/2005, 05:04 p.m. Contenido Prólogo 7 Introducción 8 Capítulo 1. Generalidades 9 Primeros habitantes 9 Primeros exploradores 9 La misión 10 La actividad ganadera 11 La actividad forestal 13 Estatus de conservación 15 Otras propuestas 16 Capítulo 2. Caracterización física 17 Fisiografía 17 Geología 21 Edafología 24 Hidrología 25 Capítulo 3. Bioclimatología 26 Clima mediterráneo 27 Bioclimatología 28 Diagramas climáticos 35 Diagrama de balance hídrico 35 Pisos bioclimáticos 44 Piso mesomediterráneo 49 Piso supramediterráneo 50 Pinos San Pedro-Preliminares.p657 04/02/2005, 05:04 p.m. Capítulo 4. Fitogeografía 48 Región californiana 57 Provincia martirense 57 Capítulo 5. Composición florística 59 Flora 59 Formas biológicas 60 Endemismo 64 Consideraciones florísticas especiales 66 Capítulo 6. Descripción de la vegetación 70 Bosque de pinus 72 Bosque de pinus de montaña 73 Bosque de Pinus quadrifolia y Pinus monophylla 75 Bosque de Pinus jeffreyi 79 Bosque mixto 81 Bosque de Pinus contorta var. murrayana 86 Bosque de Juniperus 87 Bosque de Cupressus 89 Vegetación riparia 91 Praderas 95 Capítulo 7. Comunidades fitosociológicas 95 Generalidades 95 Bosque de pino piñonero y juniperus 99 Bosques de pinus de montaña symphoricarpoi- oreophlii-Pinetum jeffreyi 106 Potentillo rimicolae-pinetum murrayanae 107 Bibliografía 109 Glosario 121 Anexo I. Catálogo florístico 127 Anexo II. Catálogo fotográfico 143 Pinos San Pedro-Preliminares.p658 04/02/2005, 05:04 p.m. Figuras Figura 1. Ubicación de la Sierra de San Pedro Mártir 18 Figura 2. Corte transversal de la Sierra de San Pedro Mártir 21 Figura 3. Leyendas de un diagrama climático 38 Figura 4. Diagrama climático de la estación meteorológica No. 95 38 Figura 5. Diagrama Balance hídrico de la estación meteorológica No. 95 42 Figura 6. Pisos de vegetación de Baja California 47 Figura 7. Distribución aproximada de los pisos bioclimáticos y de vegetación de la Sierra de San Pedro Mártir 48 Figura 8. Fitogeografía de Baja California 56 Figura 9. Representación esquemática del bosque de coníferas 74 Fotos Foto 1. Vertiente oeste de la Sierra de San Pedro Mártir 19 Foto 2. Vertiente este de la Sierra de San Pedro Mártir 19 Foto 3. Vista del Picacho del Diablo (3100 m), desde el área de Observatorio mayor 20 Foto 4. Exposición de roca granítica en la Sierra de San Pedro Mártir 19 Foto 5. Una tormenta de verano vista desde la vertiente oeste de la Sierra de San Pedro Mártir 23 Foto 6. Vista invernal (con nieve) de la zona de Vallecitos 34 Foto 7. Piso bioclimático mesomediterráneo 51 Foto 8. Piso bioclimático supramediterráneo 53 Foto 9. Comunidades de Pinus quadrifolia 76 FOTO 10. Comunidades de Pinus quadrifolia 77 Foto 11. Panorámica hacia el oeste del bosque de coníferas 81 Foto 12. Pinus jeffreyi y Quercus agrifolia a lo largo de cañadas 81 Foto 13. Comunidad de Populus tremuloides (álamo) 94 Gráficas Grafica 1. Distribución estacional de la precipitación 32 Pinos San Pedro-Preliminares.p659 04/02/2005, 05:04 p.m. Cuadros Cuadro 1. Temperatura promedio mensual de dos estaciones meteorológicas 30 Cuadro 2. Datos de temperatura de la estación meteorologica No. 95 30 Cuadro 3. Valores de precipitación media anual 32 Cuadro 4. Valores reportados de precipitación en diferentes periodos 33 Cuadro 5. Datos de evaporación (ET) de la estación meteorológica No. 95 43 Cuadro 6. Las diez familias con el mayor numero de taxa 60 Cuadro 7. Géneros con el mayor número de taxa y su forma biológica 61 Cuadro 8. Porcentaje de las formas biológicas de la flora vascular 62 Cuadro 9. Algunos de los taxa predominantes en el bosque de coníferas 63 Cuadro 10. Relación de los taxa endémicos registrados 65 Cuadro 11. Índice de abundancia-cobertura de Braun-Blanquet 96 Pinos San Pedro-Preliminares.p6510 04/02/2005, 05:04 p.m. Prólogo Este trabajo reúne información sobre los recursos naturales, particularmente la vegetación, de la Sierra de San Pedro Mártir en Baja California. Conjunta datos provenientes de importantes estudios desarrollados en la zona así como información obtenida por el autor a lo largo de más de 22 años como profesor de botánica de la Facultad de Ciencias de la Universidad Autóno- ma de Baja California. Su propósito es describir estos bosques borelaes únicos en México, con- siderados una isla biogeográfica en la península de Baja California, y su re- lación con el entorno físico (geología, edafología y clima). A partir de colectas y datos de herbarios se hace un análisis de la flora registrada en esta sierra y se describe la riqueza florística del área. Se presen- ta un listado de las especies de plantas que encontramos en la región y un catálogo ilustrado de las especies de plantas representativas del área y que pueden considerarse como las características de la estructura del bosque. Este trabajo representa un aporte para conocer mejor los aspectos físi- cos y bióticos del estado de Baja California, y de manera especial la riqueza natural de una porción muy importante no solo de esta entidad sino de nuestro país. La Sierra de San Pedro Mártir cuenta con una larga historia de decretos de protección para sus recursos naturales (reserva forestal, parque nacio- nal y reserva forestal nacional), por lo que el contenido de este libro puede ser de utilidad para la elaboración del programa de manejo de esta área na- tural protegida. Prólogo 11 Pinos San Pedro-A Prólogo.p6511 04/02/2005, 05:06 p.m. 12 El bosque de coníferas Pinos San Pedro-A Prólogo.p6512 04/02/2005, 05:06 p.m. Introducción La Sierra de San Pedro Mártir es un sistema de alta montaña localizado en el estado de Baja California. Geológicamente formado por granodioritas, es la continuación meridional de la cordillera montañosa californiana. La ve- getación en sus partes altas presenta un bosque de coníferas de carácter templado seco, similar en su fisonomía y composición florística general a los bosques del sur de California (EE.UU.). Sus características climáticas de tipo mediterráneo, únicas en México, favorecen la condición relictual de este tipo de bosque boreal en la penín- sula de Baja California. Desde la perspectiva de su bioclima, presenta dos pisos de vegetación, el supramediterráneo y mesomediterráneo superior; por su diversidad florística y sus comunidades vegetales ha sido considera- do una isla biogeográfica y una provincia fitogeográfica, la Martirense, dife- rente de la Californiania. El bosque de coníferas se distribuye a partir de los 1,500 msnm, hasta prácticamente los 3,100 m en el Picacho del Diablo, el pico más alto de la península. Su estructura es muy abierta, con un sotobosque muy pobre. Sus praderas tienen una alta diversidad de herbáceas perennes, y repre- sentan zonas de alta capacidad de captación de agua, principalmente du- rante el invierno. Este bosque de coníferas presenta un alto grado de conservación (90%), sin duda debido a lo alejado de los centros urbanos y lo poco accesible durante la época de invierno. Cuenta con los siguientes decretos: reserva forestal (1923), parque nacional (1947), reserva forestal nacional (1951). En octubre de 1996, y posteriormente en 2003, se firmó el convenio entre la SEMARNAP, la Comisión Nacional de Áreas Naturales Protegidas (CONANP) y el Introducción 13 Pinos San Pedro-B Introducción.p6513 04/02/2005, 05:07 p.m. Gobierno del Estado de Baja California para la transferencia de acciones de manejo y conservación de esa zona, también clasificada como una región terrestre prioritaria para la Conservación por la Comisión Nacional para el Conocimiento y Uso de la Biodiversidad (CONABIO) y otras instituciones. 14 El bosque de coníferas Pinos San Pedro-B Introducción.p6514 04/02/2005, 05:07 p.m. Capítulo 1. Generalidades Los primeros habitantes Los kiliwas, etnia del grupo lingüístico yumano (Meigs 1935, 1939, en Minnich et al. 1994) son los habitantes más antiguos de la Sierra de San Pedro Mártir, y de cuya presencia durante miles de años dan cuenta los vestigios arqueológicos de la región. La Sierra es, y ha sido para este grupo, su casa y su fuente de alimento (Estrada 1991). Hinton (1957 en Minnich et al. 1994) señaló que la mayoría de los kiliwas se asentaban a lo largo de Arroyo de León, una área que consideraban como su «reserva» y que les fue otorgada por el gobierno. Fueron cazadores nómadas y recolectores de plantas, utilizando mucho los recursos de la Sierra, pero también practica- ron la agricultura (Meigs 1939, Owen 1963 en Minnich et al. 1994). El princi- pal producto obtenido de estas actividades era el piñón en otoño, que co- lectaban hasta hace una década, cuando fue quemado su piñonal; por su parte, los paipai, otro grupo indígena de la región, siguen practicando su recolección hasta la fecha (Estrada 1997 en Minnich y Franco-Vizcaíno 1999). Primeros exploradores La Sierra de San Pedro Mártir fue observada a distancia por Ulloa (1539) y después por los padres jesuitas Eusebio Kino y Juan María Salvatierra (1701), durante los viajes marítimos en el Golfo de California. Posteriormente fue explotada, con algunos asentamientos durante un período relativamente corto, en la época turbulenta de la historia de las misiones, a finales del siglo XVIII (Meigs 1935 en Minnich et al.
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