THE EVALUATIONAL STUDIES ON THE SOIL RESPIRATION ON THE CO2 FIXATION BY THE USE OF FOREST RESOURCES

为了在利用森林资源固定CO_2系统的研究理念下评价土壤呼吸速率，我们尝试开发了研究森林土壤呼吸的野外设备和控制该设备的计算机软件，并获得了野外采集的行数据。该仪器包括土壤呼吸室、气流控制、通道选择器（最多6个通道）和红外气体分析仪。测量方式为两种不同的流动方式，一种是间歇使用状态，另一种是开放式系统的连续测量方式。该装置可控制3种测量模式，5路为样气路，1路为参比气路，3路为样气路，3路为参比气路，一路为样气路，一路为参比气路。风量可控制在2 ~ 5 l/min，精度在满量程的3%以内。测量项目 ...更多信息 是灭菌室的空气温度、空气流速、CO2和H2O绝对浓度、CO2和H2O差值，并计算为CO2/H2O通量和这些量。流资源：AC 100 V。我们需要很多时间来开发可接受的软件水平，并且无法在现场条件下介绍。对KOH和纯碱碱溶法与气室前后通气分析法测定土壤呼吸进行了比较研究。可在林下地面上检测装有5.1g苏打水的密闭罐的重量变化。但当空气湿度超过25%时，可采用碱溶法。由于纯碱在高湿条件下不仅吸收CO2气体，而且还吸收H2O，因此，与其他方法相比，空气通过法是最合适的方法。根据森林生态系统的碳平衡，利用CO2平衡计算模型估算了森林资源的CO2固定总量。土壤呼吸是估算森林生态系统CO2总量平衡的重要指标，几乎等于叶片呼吸和非光合器官释放的CO2总量。少

For the evaluation of soil respiration rate under the research concepts of CO2 fixation systems by use of forest resources, we try to develop the field equipment to research the soil respiration in the forest and computer software to control the equipment and to aquissit of row data taken in the field. The developing apparates equipes soil respiration chamber, controlling of air flow, channel selectors (max.6 channels), and infra-red gas analyzer. The measuring mode is two differents types as fllows ; one is intermittently use condition and the other type is continuously mode by using the open type system. The equipment can control 3 measuring modes, 5 channels use for sample gas lines and for 1 line as a refference gas line, 3 channels for sample gas line and for 3 lines as a refference gas line, and one line is sample gas and the other line is used as a refference gas line. Air flow rates can control from 2 to 5 1/min, and it's accurency is under 3% to full scale. The measuring items … More are air temperature of chamber, air flow rates, absolute CO2 and H2O concentrates, differential CO2 and H2O,and calculated to CO2/H2O flux and these amounts. Stream resources : AC 100V.We needs much time to develop the acceptable level of software, and could not introduce on the field conditions. Comparing stduies of alkali-solution method of KOH and Soda leim and gas measuring method by analyzing passing through before and after the chamber, for the measurment of soil respiration. It's avairable to check the weight changes of closed can with 5.1g soda leim on the forest floor. However, if air humidity increases over 25%, it is avairable to use alkali solution method. Because soda leim absobts not only CO2 gas but also H2O under high humidity conditions, and then air passing method is the most suitable accurency comparing to the other methods. The total CO2 fixiation of forest resources was estimated by use of CO2 balance computing model based on an carbon balance in the forest ecosystem. Soil respiration is important items for estimation of total CO2 balance of the forest ecosystems and be almost equaled to the total CO2 release from leaf respiration and non-photosynthetic organs. Less