Stand-scale transpiration estimates in a Moso bamboo forest: (I) Applicability of sap flux measurements
Stand-scale transpiration estimates in a Moso bamboo forest: (I) Applicability of sap flux measurements
复制标题
DOI：
10.1016/j.foreco.2010.07.012
复制
发表时间：
2010-09
影响因子：
3.7
通讯作者：
T. Kume;Yuka Onozawa;H. Komatsu;K. Tsuruta;Yoshinori Shinohara;T. Umebayashi;K. Otsuki
中科院分区：
文献类型：
--
作者：
T. Kume;Yuka Onozawa;H. Komatsu;K. Tsuruta;Yoshinori Shinohara;T. Umebayashi;K. Otsuki
液流通量(FD)测量在竹林中的适用性尚未得到研究。本研究旨在建立毛竹林林分尺度蒸腾(E)估测的最优有效设计。为此，我们在切竹实验中验证了毛竹的Fd测量结果。此外，我们还分析了样本量对由F和传导茎面积(As_B)计算的E估计值的可靠性的影响。在竹材切割实验中，我们发现用10 mm探头进行水分测量是确定毛竹水分利用行为的有效手段，但需要进行特定的修正。此外，根据林分AS_b(AS_STAND)和平均林分FD(JS)计算E。使用蒙特卡罗分析，我们检验了E、AS_STAND和JSS中与样本大小相关的潜在误差，使用的原始数据集分别测量了40个和16个个体的AS_BAND Fd。因此，我们确定AS_Standand JS估计值的最佳样本量为11。在不同的水汽压差和土壤水分条件下，JS的最佳样本量几乎相同。JSAT的最佳样本量研究地点小于同一地区针叶林的样本量，可能是由于毛竹林树液通量的个体差异较小。我们的研究结论是，液流通量的测量是评估毛竹林水分利用的一种可行的技术。
The applicability of sap flux (Fd) measurements to bamboo forests has not been studied. This study was undertaken to establish an optimal and effective design for stand-scale transpiration (E) estimates in a Moso bamboo forest. To this aim, we validated Fdmeasurements in Moso bamboos in a cut bamboo experiment. In addition, we analyzed how sample sizes affect the reliability of E estimates calculated from Fdand conducting culm area (AS_b). In the cut bamboo experiments, we found that Fdmeasurement using a 10mm probe was a valid means of determining the water-use behavior of a Moso bamboo, although a specific correction was needed. Furthermore, we calculated E from stand AS_b(AS_stand) and mean stand Fd(JS). Employing Monte Carlo analysis, we examined potential errors associated with sample size in E, AS_stand, and JSusing an original dataset with AS_band Fdmeasured for 40 and 16 individuals, respectively. Consequently, we determined the optimal sample size for both AS_standand JSestimates as 11. The optimal sample sizes for JSwere almost the same under different vapor pressure deficit and soil moisture conditions. The optimal sample size for JSat the study site was less than that of a coniferous plantation in the same region probably owing to small individual-to-individual variations in sap flux in the Moso bamboo forest. Our study concludes that sap flux measurements are an applicable technique for assessing water use in Moso bamboo forests.