[1]韦应欣,周利军,卜崇峰,等.两类典型荒漠生物结皮覆盖土壤碳通量月变化特征及其影响因子[J].水土保持研究,2021,28(06):153-161.
　WEI Yingxin,ZHOU Lijun,BU Chongfeng,et al.Monthly Variation Characteristics and Key Influencing Factors of Carbon Fluxes in Two Typical Desert Crusts[J].Research of Soil and Water Conservation,2021,28(06):153-161.
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两类典型荒漠生物结皮覆盖土壤碳通量月变化特征及其影响因子

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 28 期数: 2021年06期 页码: 153-161 栏目: 出版日期: 2021-10-10
Title:
Monthly Variation Characteristics and Key Influencing Factors of Carbon Fluxes in Two Typical Desert Crusts
文章编号:
1005-3409(2021)06-0153-09
作者:
韦应欣1,2，周利军3，卜崇峰1,2，骆 汉1,2，鞠孟辰1，王 春1，李亚红1，郭 琦1，李炳垠4
(1.西北农林科技大学 水土保持研究所，陕西 杨凌 712100; 2.中国科学院 水利部 水土保持研究所，陕西 杨凌 712100; 3.长江水利委员会 长江流域水土保持监测中心站，武汉 430010; 4.黄河水利委员会 黄河上中游管理局，西安 710021)
Author(s):
WEI Yingxin1,2，ZHOU Lijun3，BU Chongfeng1,2，LUO Han1,2，JU Mengchen1，WANG Chun1，LI Yahong1，GUO Qi1，LI Bingyin4
(1.Institute of Soil and Water Conservation，Northwest A&F University，Yangling，Shaanxi 712100，China; 2.Institute of Soil and Water Conservation，CAS & MWR，Yangling，Shaanxi 712100，China; 3.Central Station of Soil and Water Conservation Monitoring in the Yangtze River Basin，Changjiang Water Resources Commission，Wuhan 430010，China; 4.Upper and Middle Yellow River Bureau，Yellow River Conservancy Commission，Xi'an 710021，China)
关键词:
毛乌素沙地;  藓结皮;  藻结皮;  土壤碳通量;  月变化特征;  环境因子
Keywords:
Mu Us Sandy Land;  moss crust;  algal crust;  soil carbon flux;  monthly variation characteristics;  environmental factors
分类号:
S154.3
文献标志码:
A
摘要:
为明确荒漠生态系统生物结皮覆盖土壤碳通量的月变化特征及其关键影响因子，以裸沙作为对照，原位动态(生长期，6—11月)观测毛乌素沙地藓结皮(M)、藻结皮(AL)覆盖土壤的呼吸速率(DR)和净碳通量(NCF)，并计算得到光合速率(Pn)，同步记录相应环境指标数据。结果表明:(1)两类结皮DR与Pn均先升后降，DR在8月达峰值[M，AL分别为1.96，1.66 μmol/(m2·s)]，Pn在9月达峰值[M，AL分别为2.75，1.39 μmol/(m2·s)]; NCF先升后降再升，7月达峰值[M，AL分别为1.38，1.43 μmol/(m2·s)]，9月达谷值[M，AL分别为-1.24，-0.18 μmol/(m2·s)]。(2)2，5，10 cm土壤温度与2，5 cm土壤含水量是藓结皮覆盖土壤碳通量关键影响因子，2，5，10 cm土壤温度、光照强度、近地表空气湿度是影响藻结皮覆盖土壤碳通量的关键影响因子。(3)藓结皮净碳固定土壤水分阈值(8.9%)低于藻结皮(11.4%)，温度阈值(13.5℃)高于藻结皮(7.3℃)。以上结果表明，藓结皮与藻结皮覆盖土壤碳通量的月变化相似，但关键影响因子不同，在未来气候变化引起的增温减雨的背景下，藻结皮碳损失风险高于藓结皮。
Abstract:
In order to clarify the characteristics of monthly changes in carbon fluxes of soil covered with biological crust in desert ecosystem and its key influencing factors，the respiration rates(DR)and net carbon fluxes(NCF)of soils covered with moss crust(M)，algal crust(AL)and bare land set as the control were observed in situ dynamically(during the growing period，June-November)in Mu Us Sandy Land，and the photosynthetic rate(Pn)was calculated. The corresponding environmental index data were recorded simultaneously. The results showed that:(1)DR and Pn of both types of crusts first increased and then decreased，with DR peaking in August [1.96，1.66 μmol/(m2·s)for M and AL，respectively]; and with Pn peaking in September 2.75，1.39 μmol/(m2·s)for M and AL，respectively]; NCF first increased，then decreased and increased later，with peaking in July [1.38，1.43 μmol/(m2·s)for M and AL，respectively]，and reached a trough value in September [-1.24，-0.18 μmol/(m2·s)for M and AL，respectively];(2)temperatures of soil depths of 2 cm，5 cm and 10 cm and soil water contents of soil depths of 2 cm and 5 cm were the key influencing factors on moss crust cover soil carbon flux，temperatures of soil depths of 2 cm，5 cm and 10 cm，light intensity and near-surface air humidity were the key influencing factors on algal crust cover soil carbon flux;(3)the soil moisture threshold of net carbon fixation by moss crust(8.9%)was lower than that of algal crust(11.4%)，and the temperature threshold(13.5℃)was higher than that of algal crust(7.3℃). The above results indicated that the monthly changes of carbon fluxes of soils covered by moss crust and algal crust were similar，but the key influencing factors were different，and the risk of carbon loss in algal crust was higher than that in moss crust in the context of warming and rainfall reduction caused by future climate change.

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备注/Memo

收稿日期:2020-11-14 修回日期:2020-12-02
资助项目:国家重点研发国际合作项目(2016YFE0203400-05); 国家自然科学基金面上项目(41971131); 国家重点研发计划项目(2017YFC0504703); 杨凌示范区产学研用协同创新重大项目(2017CXY-08)
第一作者:韦应欣(1994—)，男，甘肃白银人，硕士研究生，研究方向为生物结皮及风蚀防治。E-mail:1527815148@qq.com
通信作者:骆汉(1985—)，男，山东淄博人，博士，副研究员，主要从事土壤侵蚀与水土保持研究。E-mail:hanl@ms.iswc.ac.cn

更新日期/Last Update: 2021-10-10