[1]杨娥女,王宝荣,姚宏佳,等.黄土高原生物土壤结皮发育过程中颗粒态和矿物结合态有机碳变化特征[J].水土保持研究,2023,30(01):25-33,40.[doi:10.13869/j.cnki.rswc.20220427.001]
　YANG En,WANG Baorong,YAO Hongjia,et al.Dynamics of Particulate and Mineral-Associated Organic Carbon During the Development of Biological Soil Crusts in the Loess Plateau[J].Research of Soil and Water Conservation,2023,30(01):25-33,40.[doi:10.13869/j.cnki.rswc.20220427.001]
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黄土高原生物土壤结皮发育过程中颗粒态和矿物结合态有机碳变化特征

《水土保持研究》[ISSN:1005-3409/CN:61-1272/P] 卷: 30 期数: 2023年01期 页码: 25-33,40 栏目: 出版日期: 2023-01-10
Title:
Dynamics of Particulate and Mineral-Associated Organic Carbon During the Development of Biological Soil Crusts in the Loess Plateau
文章编号:
1005-3409(2023)01-0025-09
作者:
杨娥女1, 王宝荣2,3, 姚宏佳1, 黄懿梅4, 安韶山1,3
(1.西北农林科技大学 水土保持研究所, 黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西 杨凌 712100; 2.中国科学院 水利部 水土保持与生态环境研究中心, 陕西 杨凌 712100; 3.中国科学院大学, 北京 100049; 4.西北农林科技大学 资源环境学院, 陕西 杨凌 712100)
Author(s):
YANG Enü1, WANG Baorong2,3, YAO Hongjia1, HUANG Yimei4, AN Shaoshan1,3
(1.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China; 3.University of Chinese Academy of Sciences, Beijing 100049, China; 4.College of Natural......)
关键词:
沙土;  发育阶段;  生物土壤结皮;  颗粒态有机碳;  矿物结合态有机碳
Keywords:
sandy soil;  development stage;  biological soil crust;  particulate organic carbon;  mineral-associated organic carbon
分类号:
S154.1
DOI:
10.13869/j.cnki.rswc.20220427.001
文献标志码:
A
摘要:
土壤颗粒态有机碳(POC)和矿物结合态有机碳(MAOC)是重要的土壤碳库,其比例的变化决定土壤有机碳的周转速率及稳定性。探讨沙地生物土壤结皮发育过程中颗粒态有机碳和矿物结合态有机碳的含量、分配比例和差异性特征,对于深刻认识初始土壤形成过程中有机碳库形成、稳定机制具有重要意义。选择神木市六道沟流域生物土壤结皮4个发育阶段(藻结皮、藻结皮+少量藓结皮、藓结皮+少量藻结皮、藓结皮)为研究对象,裸沙作为对照,研究生物结皮层及结皮层下层0—2 cm,2—10 cm,10—20 cm土层土壤颗粒态和矿物结合态有机碳的变化特征。结果表明:(1)在BSCs土层,POC的增加速率大于MAOC,MAOC处于饱和状态;(2)在BSCs和0—2 cm土层,以微生物源有机碳为主导的MAOC主要贡献有机碳积累,在2—10 cm和10—20 cm土层,以植物源有机碳为主导的POC主要贡献有机碳积累;(3)POC和MAOC含量随土层增加而降低,随着生物土壤结皮发育而增加;(4)POC和MAOC与SOC均有显著的正相关关系,表明结皮定殖和发育显著促进了土壤有机碳积累。这些结果表明生物土壤结皮的定殖和发育能够显著促进POC和MAOC增加进而贡献土壤有机碳的固存。在土壤早期发育过程中,MAOC对SOC的贡献占主导地位。然而由于沙土黏粒含量的缺乏导致MAOC趋于饱和时,SOC的增加或主要由POC的积累来实现。
Abstract:
Particulate organic carbon(POC)and mineral-associated organic carbon(MAOC)are important soil organic carbon pools, and changes in their proportions determine the turnover and stability of soil organic carbon(SOC). Studying the content and proportion of POC and MAOC under the development of biological soil crusts in sandy land is important for deep understanding of the formation and stabilization mechanism of organic carbon during initial soil formation. The field experiment was performed in the Liudaogou, Shenmu(northern of the Loess Plateau), Shaanxi Province, China. All sites have similar orientation and inclination. Bare sand and four biocrusts formation stages include algae, algae-moss, moss-algae, and moss. Algae-moss and moss-algae stages refer to algae-dominated biocrusts(the coverage of algae>80% and moss<0%)and moss-dominated biocrusts(the coverage of moss>80% and algae<20%), respectively. The changes of POC and MAOC in BSCs, 0—2 cm, 2—10 cm, and 10—20 cm soil layers were studied, respectively. The results showed that:(1)the rate of increase of POC was greater than MAOC in BSCs soil layer, and MAOC was in a saturated state;(2)microbe-derived organic carbon mainly contributed to organic carbon accumulation in BSCs and 0—2 cm soil layer, and plant-derived organic carbon mainly contributed to organic carbon accumulation in 2—10 cm and 10—20 cm soil layers;(3)the concentrations of POC and MAOC decreased with the increase of soil layer, and increased with the development of crust;(4)POC and MAOC had a significant positive correlation with SOC, indicating that crust colonization and development could significantly promote the accumulation of soil organic carbon. These results indicate that the establishment and development of biological soil crusts can significantly promote the increase of POC and MAOC, and they contribute to the sequestration of soil organic carbon. The contribution of MAOC to SOC dominates in the early soil development process. However, when the MAOC tends to be saturated due to the lack of clay content in sandy soil, the increase of SOC may be mainly realized by the accumulation of POC.

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备注/Memo

收稿日期:2021-10-09 修回日期:2021-10-25
资助项目:国家自然科学基金项目(41877074); 国家自然科学基金项目(42077072)
第一作者:杨娥女(1993—),女,甘肃定西人,硕士研究生,主要研究方向:土壤生态。E-mail:2215003728@qq.com
通信作者:安韶山(1972—),男,宁夏平罗人,研究员,博士生导师,主要从事土壤生态与植被恢复研究。E-mail:shan@ms.iswc.ac.cn

更新日期/Last Update: 2023-01-10