Carbon dioxide recycling in two Amazonian tropical forests
Carbon dioxide recycling in two Amazonian tropical forests
复制标题
DOI：
10.1016/s0168-1923(97)00038-5
复制
发表时间：
1997-12-30
影响因子：
6.2
通讯作者：
Nepstad, DC
中科院分区：
文献类型：
--
作者：
Sternberg, LDS;Moreira, MZ;Nepstad, DC
呼吸CO2的再循环计算与以前开发的模型使用稳定的同位素比和浓度值的环境CO2。在旱季期间，在亚马逊流域的两个不同的热带森林进行了测量。一个森林（Reserva Ducke）的特点是一个封闭的树冠，风速较低，而另一个（Fazenda维托里亚）有一个相对开放的树冠和较高的风速。封闭的树冠森林有高达39%的呼吸CO2在18米以上的森林地面回收。在这片森林中回收的百分比与收集日期的风速有关。对疏林的再循环计算给出了从0到负数的值。这片森林可能有来自附近城镇木炭窑的环境CO2污染。因此，计算循环的基础上同位素组成的环境CO2为这片森林可能是不正确的。(C)1997年Elsevier Science B.V.
Recycling of respiratory CO2 was calculated with a previously developed model using stable isotope ratios and concentration values of ambient CO2. Measurements were taken at two different tropical forests in the Amazon basin during the dry season. One forest (Reserva Ducke) was characterized by a closed canopy with lower wind speeds, while the other (Fazenda Vitoria) had a relatively open canopy and higher wind speeds. The closed canopy forest had up to 39% of its respiratory CO2 recycled at 18 m above the forest floor. Percent recycling in this forest was related to wind speed at the date of collection. Calculations of recycling on the open canopy forest gave values ranging from 0 to negative. This forest may have ambient CO2 contamination from charcoal kilns in a nearby town. Thus, calculations of recycling based on isotopic composition of ambient CO2 for this forest may be incorrect. (C) 1997 Elsevier Science B.V.