Net ecosystem exchange of CO2 and H2O in a subtropical mountain cloud forest (Taiwan)

本研究旨在利用涡度相关方法，量化台湾亚热带山地云雾林生态系统的CO2和H2O净交换，并获得更多关于复杂地形下CO2和H2O输入和输出通量的信息。台湾北方海拔1650米的亚热带山地云雾林，本文提出本研究的目的是研究的CO2预算和可能的平流估计净生态系统-大气交换的Chamaaparis obtusa var。台湾的台湾钝头钟花变种台湾扁柏是一种特殊的柏树，只生长在台湾的高山云区，最近通过林业活动再生。在全球变化的研究内容中，对CO2生物圈-大气交换的定量研究是非常重要的，尤其是在研究较少的地区。同样重要的是，要改进对异质地形的测量方法，以便能够量化各种森林冠层的气体交换。虽然在文献中存在广泛的讨论平流通量，平流和水平通量散度的NEE测量的贡献的直接观察是罕见的。这一问题应采用涡度相关方法，用二维观测资料来解决。

The aim of the project is to quantify the net ecosystem exchange of CO2 and H2O in a subtropical mountain cloud forest in Taiwan by using the eddy covariance method, and to achieve more information about the import and export fluxes of CO2 and H2O over complex terrain.An experimental ecosystem research study close to the Yuan Yang Lake (YYL) site, in the subtropical mountain cloud forest of northern Taiwan at 1650 m a.s.l., is proposed. The aim of the study is to examine the CO2 budget and possible advection on estimates of net ecosystem-atmosphere exchange within a stand of Chamaecyparis obtusa var. formosana in Taiwan. Chamaecyparis obtusa var. formosana is an extraordinarily cypress species which only grows in the mountain cloud regions in Taiwan and which has been regenerated through forestry activities lately. In the content of global change, it is very important to quantify the CO2 biosphere-atmosphere exchange especially of the not well examined regions. It is also important to advance measurement methods on heterogeneous terrain so that it will become feasible to quantify gas exchange over various forest canopies. Although extensive discussion of the advective fluxes exists in literature, direct observations of the contributions of advection and horizontal flux divergence to NEE measurements are rare. The problem should be solved with two dimensional measurements by using the eddy covariance method.