Thaw Depth Determines Dissolved Organic Carbon Concentration and Biodegradability on the Northern Qinghai‐Tibetan Plateau

Mu C. C.; Abbott B. W.; Wu X. D.; Zhao Q.; Wang H. J.; Su H.; Wang S. F.; Gao T. G.; Guo H.; Peng X. Q.; Zhang T. J.

摘要

Abstract > The response of dissolved organic carbon (DOC) flux to permafrost degradation is one of the major sources of uncertainty in predicting the permafrost carbon feedback. We investigated DOC export and properties over two complete flow seasons in a catchment on the northern Qinghai‐Tibetan Plateau. DOC concentration and biodegradability decreased systematically as thaw depth increased through the season, attributable to changing carbon sources and degree of microbial processing. Increasing DOC aromaticity and δ 13 C‐DOC indicated shifts toward more recalcitrant carbon sources and greater residence time in soils prior to reaching the stream network. These strong and consistent seasonal trends suggest that gradual active layer deepening may decrease DOC export and biodegradability from permafrost catchments. Because these patterns are opposite observations from areas experiencing abrupt permafrost collapse (thermokarst), the overall impact of permafrost degradation on DOC flux and biodegradability may depend on the proportion of the landscape experiencing gradual thaw versus thermokarst. </abstract> </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 Type =“Main”XML：Lang =“en”> <标题类型=“main”>摘要</标题> >溶解有机碳（Doc）通量对多年冻土退化的响应是主要来源之一不确定性在预测永久冻土碳反馈中的不确定性。在青藏高原北部的集水区内调查了两个完整的流动季节的Doc出口和财产。 DOP浓度和生物降解性系统地随着季节增加，可归因于碳源和微生物加工程度的季节增加。增加Doc芳香度和δ 13 </ sup> C-Doc指出在到达流网络之前在土壤中朝向更多克隆碳源和更高的停留时间。这些强大和一致的季节性趋势表明，逐渐积极的层深化可能会降低多重冻土集水区的DOC导出和生物降解性。因为这些模式是从经历突然的强度塌陷（Thermokarst）的区域的相反观测，所以Permafrost降解对Doc助熔剂和生物降解性的总体影响可能取决于经历逐渐解冻的景观的比例与热潮流。 </ p> </ abstract> </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-23539/'>《Geophysical Research Letters 》</a> <b style="margin: 0 2px;">|</b><span>2017年第18期</span><b style="margin: 0 2px;">|</b> <span>共11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=Mu C. C.&option=202" target="_blank" rel="nofollow">Mu C. C.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Abbott B. W.&option=202" target="_blank" rel="nofollow">Abbott B. W.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Wu X. D.&option=202" target="_blank" rel="nofollow">Wu X. D.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Zhao Q.&option=202" target="_blank" rel="nofollow">Zhao Q.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Wang H. J.&option=202" target="_blank" rel="nofollow">Wang H. J.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Su H.&option=202" target="_blank" rel="nofollow">Su H.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Wang S. F.&option=202" target="_blank" rel="nofollow">Wang S. F.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Gao T. G.&option=202" target="_blank" rel="nofollow">Gao T. G.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Guo H.&option=202" target="_blank" rel="nofollow">Guo H.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Peng X. Q.&option=202" target="_blank" rel="nofollow">Peng X. Q.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Zhang T. J.&option=202" target="_blank" rel="nofollow">Zhang T. J.;</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>Key Laboratory of Western China's Environmental Systems College of Earth and Environmental SciencesLanzhou UniversityLanzhou China;</p> <p>Department of Plant and Wildlife SciencesBrigham Young UniversityProvo UT USA;</p> <p>Cryosphere Research Station on the Qinghai‐Tibet Plateau State Key Laboratory of Cryospheric Science Northwest Institute of Eco‐Environment and ResourceChinese Academy of SciencesLanzhou China;</p> <p>Key Laboratory of Western China's Environmental Systems College of Earth and Environmental SciencesLanzhou UniversityLanzhou China;</p> <p>Key Laboratory of Western China's Environmental Systems College of Earth and Environmental SciencesLanzhou UniversityLanzhou China;</p> <p>Key Laboratory of Western China's Environmental Systems College of Earth and Environmental SciencesLanzhou UniversityLanzhou China;</p> <p>Key Laboratory of Western China's Environmental Systems College of Earth and Environmental SciencesLanzhou UniversityLanzhou China;</p> <p>Key Laboratory of Western China's Environmental Systems College of Earth and Environmental SciencesLanzhou UniversityLanzhou China;</p> <p>Key Laboratory of Western China's Environmental Systems College of Earth and Environmental SciencesLanzhou UniversityLanzhou China;</p> <p>Key Laboratory of Western China's Environmental Systems College of Earth and Environmental SciencesLanzhou UniversityLanzhou China;</p> <p>Key Laboratory of Western China's Environmental Systems College of Earth and Environmental SciencesLanzhou UniversityLanzhou China;</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/163.html" title="地球物理学">地球物理学 ;</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=permafrost&option=203" rel="nofollow">permafrost;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=active layer&option=203" rel="nofollow">active layer;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=thaw depth&option=203" rel="nofollow">thaw depth;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=thermokarst&option=203" rel="nofollow">thermokarst;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=seasonality&option=203" rel="nofollow">seasonality;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=flow path&option=203" rel="nofollow">flow path;</a> </p> <div class="translation"> 机译：PEMAFROST;有源层;解冻深度;Thermokarst;季节性;流动路径; </div> </li> </ul> </div> </div> <div class="literature cardcommon"> <div class="similarity "> <h3 class="all_title" id="enpatent66">相似文献</h3> <div class="similaritytab clearfix"> <ul> <li class="active" >外文文献</li> <li >中文文献</li> <li >专利</li> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704019850347.html">Thaw Depth Determines Dissolved Organic Carbon Concentration and Biodegradability on the Northern Qinghai‐Tibetan Plateau</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Mu C. 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