Logging effects on liana diversity and abundance in Central Guyana

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Methodology § Logged – L R, plot was logged using reduced impact logging techniques; L C, plot was logged using conventional logging; C, plot was not logged and used as a control; (L R-s), plot was logged and silviculturally treated but only prelogging data were used. ¥ Treatment – Design criteria for the <strong>Logging</strong> Experiment, expressed as number of trees logged per hectare, applied over 5.76 ha. Actual harvest intensity in the 1 ha census plot is in column Harvest intensity. † Census history – P is pre-harvest enumeration (t-1); +2, + 4 etc is the number of years since harvest. (+) refers to control plots which were enumerated in the same years as harvested plots even though it is impossible to speak of “years since harvest”. ‡ Purpose – Purpose for which these plots were used in this study. LE plots were monitored for the <strong>Logging</strong> Experiment; CS plots were used for the Chronosequence. Three plots in Pibiri had a dual purpose; silviculturally treated plots were used for descriptive purposes only. $ Harvest intensity – actual number of trees and basal area felled in the census plot; dbh ≥35 cm. £ Overestimate; this total includes individuals
<strong>Logging</strong> <strong>effects</strong> on liana diversity and abundance in Central Guyana flavida and M. racemosa) and Malpighiaceae/Hippocrateaceae complex (Tontelea attenuata, Cheiloclinium cognatum and Salacia multiflora). Complexes and partially identified species are not included in the analysis. Together, individuals of these species make up c. 11% of total liana abundance, running up to c. 20% for individuals ≥2.5 cm dbh, so the results must be affected by not including these species and individuals. 2 m 5 m 10 m 100 m 20 m Figure 2.1 Layout of a one ha BSP with subdivision in 25 enumeration units (left) and nested enumeration unit used to enumerate lianas of different size classes (cf. Table 2.2, right). The gray area in the left-hand panel represents the area used to obtain Sample A, the basis for most analysis in this report. In rare cases, variation in species identity may have been retained in the final dataset. Their presence is apparent in the unexpected decrease and increase of pairs of species between censuses of the same plot. 2.3.6 Measurements Lianas All liana individuals were measured in nested subplots depending on their size (Table 2.2). Individuals, which were rooted outside the subplot but grew into it, were excluded. Members of a clonal group with above-ground connections were regarded as a single individual. In that case the largest sprout was measured. Lianas that looped back to the ground and produced adventitious roots in the subplot were excluded (unless the main root system was also located in the subplot) The following data were recorded for each individual: • Species name, usually a morphospecies name; • X and Y coordinates of the stem base relative to the plot origin, calculated from compass readings taken from two corner pegs; • Stem length in 0.05 m intervals for individuals
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Logging effects on liana diversity and abundance in Central Guyana

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