Effects of natural vegetation restoration on dissolved organic matter (DOM) biodegradability and its temperature sensitivity

doi:10.1016/j.watres.2020.116792

	Effects of natural vegetation restoration on dissolved organic matter (DOM) biodegradability and its temperature sensitivity
	Liu, Hongfei 1,2,3; Xu, Hongwei 1,3; Wu, Yang 1,3; Ai, Zemin 1,3; Zhang, Jiaoyang 1,3; Liu, Guobin 1,3; Xue, Sha 1,3
刊名	WATER RESEARCH
	2021-03-01
卷号	191 页码:12
关键词	Temperature sensitivity DOM biodegradation Dissolved organic carbon Dissolved organic nitrogen Three-dimensional excitation-emission matrix (EEM) fluorescence spectroscopy Secondary vegetation succession
ISSN号	0043-1354
DOI	10.1016/j.watres.2020.116792
通讯作者	Xue, Sha(xuesha100@163.com)
英文摘要	Biodegradation of dissolved organic matter (DOM) plays a key role in regulating both production of greenhouse gases and accumulation and stabilisation of soil organic matter (SOM). However, the mechanisms by which natural vegetation restoration affects the extent, rate, and temperature sensitivity of DOM biodegradation are poorly understood. Elucidating these mechanisms is important for SOM management, especially in light of future climate warming scenarios. In this study, a laboratory DOM solution incubation experiment was conducted to comprehensively investigate the effects of temperature and natural vegetation restoration spanning a period of 160 y on DOM biodegradation in the Loess Plateau, China. The results indicated that dissolved organic C (DOC) biodegradation significantly decreased with vegetation restoration after an incubation period of 60 d. Further, biodegradation of dissolved organic N (DON) and dissolved organic P (DOP) significantly decreased after farmland abandonment. Specifically, the lowest values were observed in pioneer (Populus davidiana) and mingled (Populus davidiana and Quercus liaotungensis) forests. Generally, an increase in temperature significantly promoted the biodegradation of DOC, DON, and DOP by enhancing the microbial utilisation efficiencies of recalcitrant humic substrates (i.e., low-molecular-weight humic materials). Our results suggest that DOM biodegradability and its temperature sensitivity were regulated by DOM substrate quality (i.e, recalcitrant humic materials), and microbial properties (i.e., gram-negative bacterial and fungal PLFA, enzyme activities). Additionally, our results suggest that climax forest communities (Quercus liaotungensis) played a vital role in reducing DOC and DOP losses. This could be attributed to the low Q10 of the DOC and DOP biodegradation rates. (c) 2020 Elsevier Ltd. All rights reserved.
资助项目	National Key Research and Development Program of China[2016YFC0501707] ; National Natural Science Foundation of China[41771557]
WOS研究方向	Engineering ; Environmental Sciences & Ecology ; Water Resources
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000615940000004
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/160555]
专题	中国科学院地理科学与资源研究所
通讯作者	Xue, Sha
作者单位	1.Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 2.Univ Bayreuth, Dept Agroecol, D-95440 Bayreuth, Germany 3.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Liu, Hongfei,Xu, Hongwei,Wu, Yang,et al. Effects of natural vegetation restoration on dissolved organic matter (DOM) biodegradability and its temperature sensitivity[J]. WATER RESEARCH,2021,191:12.
APA	Liu, Hongfei.,Xu, Hongwei.,Wu, Yang.,Ai, Zemin.,Zhang, Jiaoyang.,...&Xue, Sha.(2021).Effects of natural vegetation restoration on dissolved organic matter (DOM) biodegradability and its temperature sensitivity.WATER RESEARCH,191,12.
MLA	Liu, Hongfei,et al."Effects of natural vegetation restoration on dissolved organic matter (DOM) biodegradability and its temperature sensitivity".WATER RESEARCH 191(2021):12.