CO <sub xmlns='http://www.wiley.com/namespaces/wiley'>2</sub>2 fluxes in subtropical dryland soils—a comparison of the gradient and the closed‐chamber method

Luther-Mosebach Jona; Kalinski Kira; Gr?ngr?ft Alexander; Eschenbach Annette

摘要

Abstract > On the plot scale, closed dynamic chamber methods (CDCM) are the most popular technique to directly measure CO <sub>2</sub> fluxes from the soil surface to the atmosphere. However, the gradient method (GM) provides several advantages, which refer to the underground processes contributing to the CO <sub>2</sub> production that cannot be investigated by the CDCM. To evaluate the suitability of the GM in dryland soils, we compared feasibility and quality of results for both methods. The GM is based on Fick's law and requires knowledge on diffusion properties of the soil, concentration gradients between soil and atmosphere, and the air‐filled porosity. Our study was conducted on two sites along the Okavango River, one in Namibia (semi‐arid) and the other in Angola (semi‐humid) with comparable sandy soil texture. The CO <sub>2</sub> concentration profile was determined by collecting soil gas samples from different soil depths. CO <sub>2</sub> efflux was measured with a vented steady‐state closed chamber system. Soil gas diffusivities were measured in lab experiments using diffusion chambers and undisturbed soil cores. Modeled diffusivities were predicted according to six popular models based on air‐filled porosity and total porosity as input parameters. Results show strong agreement between CDCM and GM fluxes based on measured diffusivities. However, with modeled diffusivities overestimation of fluxes for most of the tested models, especially at high air‐filled porosity, were detected. We conclude that the GM offers a valuable tool for flux estimates on the pedon scale in dry ecosystems particularly in combination with measured diffusivities and includes the possibility for investigating subsurface processes involved in the CO <sub>2</sub> </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><Abstract XMLNS =“http://www.wiley.com/namespaces/wiley”type =“main”xml：lang =“en”> <title type =“main”>抽象</ title> >绘制规模，闭合动态室方法（CDCM）是最流行的技术，可以直接测量从土壤表面到大气中的CO <SUB> 2 </ sub>通量。然而，梯度法（GM）提供了几个优点，这是指贡献的地下过程，该过程有助于CDCM无法研究的CO <sub> 2 </ sub>生产。为了评估GM在Dryland土壤中的适用性，我们比较了两种方法的可行性和质量。通用汽车基于Fick的法律，需要了解土壤的扩散性质，土壤和大气之间的浓度梯度以及充气孔隙率。我们的研究是在Okavango River的两个地点进行，其中一个在纳米比亚（半干旱），另一个在安哥拉（半湿润），具有可比的沙地纹理。通过从不同的土壤深度收集土壤气体样品来确定CO <亚> 2 </ sub>浓度分布。用通风稳态闭合室系统测量CO <SUB> 2 </ sub> EFFLUX。使用扩散室和未受干扰的土壤芯测量土壤气体扩散性。根据六种流行型号基于充气孔隙率和总孔隙率作为输入参数，预测建模扩散性。结果表明，基于测量的扩散性，CDCM和GM助焊剂之间的强烈一致。然而，对于大多数测试模型的大多数测试模型的模型扩散率，特别是在高空气填充孔隙率上。我们得出结论，通用汽车提供了一种有价值的工具，用于干燥生态系统中的佩氏尺度的助焊剂估计，特别是与测量的扩散性相结合，并且包括研究CO <sub> 2 </ sub>中涉及的地下过程的可能性 </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-35667/'>《Journal of plant nutrition and soil science》</a> <b style="margin: 0 2px;">|</b><span>2018年第1期</span><b style="margin: 0 2px;">|</b><span>共10页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Luther-Mosebach Jona&option=202" target="_blank" rel="nofollow">Luther-Mosebach Jona;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kalinski Kira&option=202" target="_blank" rel="nofollow">Kalinski Kira;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Gr?ngr?ft Alexander&option=202" target="_blank" rel="nofollow">Gr?ngr?ft Alexander;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Eschenbach Annette&option=202" target="_blank" rel="nofollow">Eschenbach Annette;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>Institute of Soil ScienceUniversity of HamburgAllende‐Platz 2 20146 Hamburg Germany;</p> <p>Institute of Soil ScienceUniversity of HamburgAllende‐Platz 2 20146 Hamburg Germany;</p> <p>Institute of Soil ScienceUniversity of HamburgAllende‐Platz 2 20146 Hamburg Germany;</p> <p>Institute of Soil ScienceUniversity of HamburgAllende‐Platz 2 20146 Hamburg Germany;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/212.html" title="农业基础科学">农业基础科学;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=carbon dioxide efflux&option=203" rel="nofollow">carbon dioxide efflux;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=CO 2 concentration profiles&option=203" rel="nofollow">CO 2 concentration profiles;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=savanna&option=203" rel="nofollow">savanna;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=soil gas diffusivity&option=203" rel="nofollow">soil gas diffusivity;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=soil respiration&option=203" rel="nofollow">soil respiration;</a> </p> <div class="translation"> 机译：二氧化碳流出;CO 2浓度谱;遗布;土壤气体扩散率;土壤呼吸; 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CO 22 fluxes in subtropical dryland soils—a comparison of the gradient and the closed‐chamber method

摘要

CO ₂2 fluxes in subtropical dryland soils—a comparison of the gradient and the closed‐chamber method