Hot Spots Of Soil Respiration In A Seasonally Dry Tropical Forest In Southern Vietnam: A Brief Study Of Spatial Distribution

Geography, Environment, Sustainability

Julia A. Kurbatova¹  Ivan P. Kotlov¹  Dmitry G. Ivanov¹  Konstantin K. Avilov²  Vitaly K. Avilov²  Do Phong Luu²  Nguyen Van Thinh³ 

[1] Joint Russian-Vietnamese tropical research center, Soutern branch;A.N. Severtsov Institute of Ecology and Evolution RAS;Marchuk Institute for NumericalMathematicsRAS;

关键词: soil respiration;    carbon emission;    hot spots;    tropicalforest;    spatial variability;    sample size;   

DOI  :  10.24057/2071-9388-2018-87

来源: DOAJ

【 摘 要 】

Many studies report  asymmetrical  spatial distribution  of soil respiration caused by presence of areas with significantly higher emission rates (so-called hot spots). For seasonally dry tropical  forest soil respiration  was measured on 1 ha plot with 20m, 5m and 1 m scale in the first half of dry season. 457 measurements made in 9 series at 54 sampling points. The results suggest  that lognormal  spatial distribution  model appears to be much more supported  rather than the normal one. A statistical method  proposed for estimation the mean value and its confidence  interval of lognormally distributed data. The mean emission rate E(RS) for the lognormal distribution amounted  to 4.28 µmol m-2 s-1, the 95% confidence  interval is 3.93 to 4.76 µmol m-2 s-1. However, the standard sample mean can be used as an estimator of the mean of lognormally distributed values of soil respiration  if their coefficient  of variance remains approximately the same as in our study (CV=0.35).  Based on the data obtained and literature  sources,  recommendations  are given on the number of sampling  points for estimating the spatial average value with a given accuracy.

【 授权许可】

Unknown