کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9620408 | 159409 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Stand dynamics and basal area change in a tropical dry forest reserve in Nicaragua
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Stand dynamics and basal area change in a tropical dry forest reserve in Nicaragua Stand dynamics and basal area change in a tropical dry forest reserve in Nicaragua](/preview/png/9620408.png)
چکیده انگلیسی
Stand dynamics and basal area change were determined in deciduous and gallery forest types at the Chacocente Wildlife Reserve, Nicaragua. All stems â¥10 cm dbh in 4 ha were tagged and identified by species and measured in 1993 and 2000. In year 2000 totally 519 stems haâ1 with a basal area of 15.62 m2 haâ1 were recorded in the deciduous forest type and corresponding figures were 308 stems haâ1 and 23.13 m2 haâ1 for the gallery forest type. Comparison of stem diameter and basal area distribution during this study period revealed no changes. Both forests types had a reversed J-shape diameter distribution dominated (>80%) by small stems (<30 cm dbh). In the deciduous forest small stems contributed to more than half of the basal area, whereas in the gallery forest large stems (>70 cm dbh) contributed to almost half the basal area. Based on a logarithmic model the mortality and recruitment rates were calculated at 4.5 and 2.5% yearâ1, respectively, in the deciduous forest type and 4.2 and 4.0% in the gallery forest type. The decrease in stand density in the deciduous forest type was significant whereas it was not the case for the gallery forest type. There was also a significant decrease in basal area of 1.2% yearâ1 in the deciduous forest and no change in the gallery forest. The recorded median diameter (dbh) increment was 0.14 cm yearâ1 with a range of 1.21 cm yearâ1 in the deciduous forest type and corresponding figures for the gallery forest were 0.24 cm yearâ1 and 0.71 cm yearâ1. Three of the five most common species in the deciduous forest, Lonchocarpus minimiflorus, Gyrocarpus americanus and Stemmadenia ovovata had mortality rates above 9%. Although L. minimiflorus and S. ovovata had recruitment rates above average the net balance was negative. Among the five most common species only Tabebuia ochracea a timber species had an annual recruitment higher than its mortality rate. Non-timber species as a group had the largest calculated negative balance between mortality and recruitment as well as between loss and gain of basal area indicating a possible anthropogenic influence. In the gallery forest Capparis pachaca was the only species, out of the most common, with a positive annual balance. In both forest types there was a higher than average calculated recruitment and basal area growth for species with no local use.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Forest Ecology and Management - Volume 208, Issues 1â3, 5 April 2005, Pages 63-75
Journal: Forest Ecology and Management - Volume 208, Issues 1â3, 5 April 2005, Pages 63-75
نویسندگان
Guillermo Castro MarÃn, Robert NygÃ¥rd, Benigno Gonzales Rivas, Per Christer Oden,