School of Electronic and Information Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
School of Information Engineering, Zhejiang A & F University, Hangzhou 311300, China.
Sensors (Basel). 2018 Nov 16;18(11):3986. doi: 10.3390/s18113986.
Estimation of regional soil carbon flux is very important for the study of the global carbon cycle. The spatial heterogeneity of soil respiration prevents the actual status of regional soil carbon flux from being revealed by measurements of only one or a few spatial sampling positions, which are usually used by traditional studies for the limitation of measurement instruments, so measuring in many spatial positions is very necessary. However, the existing instruments are expensive and cannot communicate with each other, which prevents them from meeting the requirement of synchronous measurements in multiple positions. Therefore, we designed and implemented an instrument for soil carbon flux measuring based on dynamic chamber method, , which can measure soil carbon flux and communicate with each other to construct a sensor network. In its working stage, a node measures the concentration of carbon in the chamber with an infrared carbon dioxide sensor for certain times periodically, and then the changing rate of the measurements is calculated, which can be converted to the corresponding value of soil carbon flux in the position during the short period. A wireless sensor network system using s as soil carbon flux sensing nodes can carry out multi-position measurements synchronously, so as to obtain the spatial heterogeneity of soil respiration. Furthermore, the sustainability of such a wireless sensor network system makes the temporal variability of regional soil carbon flux can also be obtained. So makes thorough monitoring and accurate estimation of regional soil carbon flux become more feasible.
区域土壤碳通量的估算对于全球碳循环的研究非常重要。土壤呼吸的空间异质性使得仅通过传统研究中常用的一个或几个空间采样点的测量来揭示区域土壤碳通量的实际情况变得不可能，这是由于测量仪器的限制，因此需要在许多空间位置进行测量。然而，现有的仪器昂贵且无法相互通信，这使得它们无法满足多个位置同步测量的要求。因此，我们设计并实现了一种基于动态室法的土壤碳通量测量仪器 ，该仪器可以测量土壤碳通量并相互通信以构建传感器网络。在其工作阶段，一个 节点使用红外二氧化碳传感器定期对腔室内的二氧化碳浓度进行一定时间的测量，然后计算测量值的变化率，该变化率可以转换为短时间内该位置的土壤碳通量的相应值。使用 s 作为土壤碳通量感应节点的无线传感器网络系统可以实现多位置的同步测量，从而获得土壤呼吸的空间异质性。此外，这种无线传感器网络系统的可持续性使得还可以获得区域土壤碳通量的时间变异性。因此， 使得对区域土壤碳通量进行全面监测和精确估计变得更加可行。
