Vegetal structure and diversity in a pine-oak forest with disturbances in different chronosequences

被引:0
|
作者
Ruiz Gonzalez, Miguel Angel [1 ]
Campos Angeles, Gisela Virginia [2 ]
Reyes Hernandez, Valentin Jose [3 ]
Rodriguez Ortiz, Gerardo [2 ]
Raymundo Enriquez del Valle, Jose [2 ]
机构
[1] Tecnol Nacl Mexico, Inst Tecnol Valle Oaxaca, Programa Maestria Ciencias Productividad Agroecos, Nazareno Xoxocotlan, Oaxaca, Mexico
[2] Tecnol Nacl Mexico, Inst Tecnol Valle Oaxaca, Div Estudios Posgrad & Invest, Nazareno Xoxocotlan, Oaxaca, Mexico
[3] Colegio Postgrad, Postgrad Ciencias Forest, Campus Montecillo, Montecillo, Estado De Mexic, Mexico
关键词
temperate forest; herbaceous; fire; diversity index; grazing; regeneration; ECOLOGICAL RESTORATION; SECONDARY VEGETATION; SPECIES COMPOSITION; VASCULAR EPIPHYTES; SUCCESSION; TEMPERATE; DYNAMICS; BIOMASS; CONSEQUENCES; GRASSLAND;
D O I
10.21829/myb.2022.2812245
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
The dynamics that the structure and diversity of the vegetation follow in a site after suffering a disturbance is an indicator of the resilience of the affected ecosystem. Therefore, the floristic composition and changes in plant succession were analyzed according to the chronosequence of different disturbances, in a pine-oak forest in southern Oaxaca, Mexico. Selective sampling was used, 28 sampling sites of 400 m(2) were established, in which a census of all vascular individuals was carried out during the dry and rainy seasons of 2018. Alpha and beta diversity were estimated and analyzed; the vertical and horizontal structure in all the chronosequences: 1) fires, (IF), occurred one (IF-1), five (IF-5) and six (IF-6) years ago; 2) farmland with agricultural fallow, (DA), eight (DA-8) and 20 years (DA-20); 3) free grazing (PA) and, 4) a reference area, without intervention (C1). The highest richness (89) was recorded during the rainy season (F = 0.0154) in an area with agricultural fallow for 20 years. In the area burned a year earlier, the lowest diversity Shannon=1.26 and Shannon=1.60 was observed in both seasons. The highest importance value index (86.55%) was calculated for Pinus lawsonii Roezl in the area burned six years ago. The disturbance caused by fire is the one that caused the greatest damage to the structure and diversity of the vegetation, but it was also the one in which the vegetation appeared in less time after it. The floristic composition varied according to the type, severity and time elapsed after the disturbance, while the richness of species was related to the plant structure in the site, which determines the microenvironmental conditions. The results are useful for implementing restoration and conservation measures.
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页数:16
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