干旱区生态环境知识资源中心(Arid): Implication of different humic acid fractions in soils under karst rocky desertification

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DOI	10.1016/j.catena.2018.11.028
	Implication of different humic acid fractions in soils under karst rocky desertification
	Di, Xinyue; Xiao, Baohua; Dong, Hui; Wang, Shijie
通讯作者	Xiao, Baohua
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2019
卷号	174 页码:308-315
英文摘要	Karst rocky desertification, a kind of intense soil degradation, has become an urgent environmental issue in the karst region of southwest China. It was found that limestone soil, a typical soil of the karst region, is more vulnerable to karst rocky desertification than adjacent other soils although limestone soil has relatively high TOC (total organic carbon) content, but underlying mechanisms remain unclear. To investigate roles of soil properties in karst rocky desertification, three major soils, limestone soil, yellow soil and yellow brown soil, of the karst region of southwest China were sampled and their total extractable humic acid (THA) were fractionated into three sub-fractions, namely, free HA (HAf), encapsulated HA (HAe) and interacted HA (HAi), with a sequential extraction method. These soils and fractionated HA samples were systematically characterized with various analysis methods and discussed. The results showed that limestone soil had higher contents of total organic content (TOC) and THA content, but its THAC/TOC (carbon in THA to TOC) ratio (23.39%) was lower than those of yellow soil (31.44%) and yellow-brown soil (30.74%); C/N ratios and total acid contents of HAe and HAi fractions, which were physically protected by soil minerals/aggregates, were much higher than those of HAf fractions, indicating that HAe and HAi could be more active and degraded easier than HAf once exposed to microbes or/and runoff erosions. Therefore, lower HAf content and significantly lower HAfC/TOC (carbon in HAf to TOC) ratio of limestone soil may underlie the observation that limestone soil showed weak resistance to karst rocky desertification compared to other adjacent soils when the site had been artificial disturbed. We believe that roles of different HA fractions to overall quality and stability of soil deserve more attention.
英文关键词	Humic acid Sequential extraction Soil Characteristics Karst rocky desertification
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000456754600029
WOS关键词	ORGANIC-MATTER ; SPECTROSCOPIC PROPERTIES ; CHEMICAL-STRUCTURE ; FOREST FLOOR ; LAND-USE ; SUBSTANCES ; SEDIMENTS ; SURFACE ; AMENDMENTS ; TITRATION
WOS类目	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS研究方向	Geology ; Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214819
作者单位	Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, 99 Lincheng West Rd, Guiyang 550081, Guizhou, Peoples R China
推荐引用方式 GB/T 7714	Di, Xinyue,Xiao, Baohua,Dong, Hui,et al. Implication of different humic acid fractions in soils under karst rocky desertification[J],2019,174:308-315.
APA	Di, Xinyue,Xiao, Baohua,Dong, Hui,&Wang, Shijie.(2019).Implication of different humic acid fractions in soils under karst rocky desertification.CATENA,174,308-315.
MLA	Di, Xinyue,et al."Implication of different humic acid fractions in soils under karst rocky desertification".CATENA 174(2019):308-315.