Evaluation of sampling with partial replacement in two successive occasions in a forest managed area in the municipality Paragominas, Para, Brazil

编号 030022503

推送时间 20200210

研究领域 森林经理 

年份 2020 

类型 期刊 

语种 葡萄牙语

标题 Evaluation of sampling with partial replacement in two successive occasions in a forest managed area in the municipality Paragominas, Para, Brazil

来源期刊 Evaluation of sampling with partial replacement in two successive occasions in a?forest?managed area in the municipality Paragominas, Para, Brazil

期 第225期

发表时间 20191201

关键词 Continuous forest inventory;  Permanent sample plots;  Growth and yield;  Tropical forest; 

摘要 The Brazilian?forest?legislation establishes that the intensity of logging should be planned based on studies to determine volume increment of the?forest?under?management. In this context, sampling processes on successive occasions are of utmost importance. Amongst these processes, continuous?forest?inventory (CFI) using permanent sampling plots is more widespread and applied in the Brazilian Amazon. An alternative less used in the tropics is the sampling with partial replacement (SPR). The present study aimed at evaluating the application of the SPR as an alternative process to monitoring growth and yield of natural forests in the Brazilian Amazon. Data from 30 permanent plots set space the Annual Production Units 4 and 5 of Rio Capim?Forest?Management?Plan owned by the company CKVB Florestal Ltda. were used in the study. The?forest?management?unit is located in Paragominas municipality in the state of Para, Brazil. The plot sizes are 50mx50m (0.25ha) and were measured in 2001 and in 2004. All individuals with diameter at breast height (DBH) >= 10 cm, were recorded and used in this study. SPR was compared to CFI using permanent sampling plots. Sampling precision and relative efficiency were used for comparisons. Relative efficiency was defined as the ratio of mean variances. The total volume estimated on the first occasion using SPR was 219,15 m(3)ha(-1) +/- 37,56 m(3)ha(-1) and 236,84 m(3)ha(-1) +/- 39.69 m(3) ha(-1) on the second occasion; for CFI the total volume was 217,12 m(3) ha(-1) +/- 43,96 m(3) ha(-1) for the first occasion and 232,32 m(3) ha(-1) +/- 44,44 m(3)ha(-1) for the second occasion. Periodic mean annual increment (PAI) was 4,66 m 3 ha(-1)year(-1) for SPR and 4,68 m 3 ha(-1)year(-1) for CFI. SPR was more efficient to estimate volume stock whereas CFI was more efficient to estimate the periodic annual increment (PAI). No statistical differences were found between estimates of the two processes. Estimates by SPR proved to be competitive when compared to CFI and therefore can be used as an alternative for monitoring growth and yield in the Brazilian Amazon.

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