干旱区生态环境知识资源中心(Arid): Grazing enhanced spatial heterogeneity of soil dehydrogenase activity in arid shrublands of Patagonia, Argentina

Arid

DOI	10.1007/s11368-019-02440-1
	Grazing enhanced spatial heterogeneity of soil dehydrogenase activity in arid shrublands of Patagonia, Argentina
	Marcos, Magali S.1; Carrera, Analia L.2,3; Bertiller, Monica B.2,3; Olivera, Nelda L.1
通讯作者	Olivera, Nelda L.
来源期刊	JOURNAL OF SOILS AND SEDIMENTS
ISSN	1439-0108
EISSN	1614-7480
出版年	2020
卷号	20 期号:2 页码:883-888
英文摘要	Purpose The impacts of sheep grazing on soil microorganisms and enzyme activities are not yet fully understood in arid and semi-arid regions, despite the fact that most grazed lands are drylands. Therefore, this study aimed to analyze the temporal (seasonal samplings in a 2-year study) and spatial (plant-covered patches vs. inter-patches) variability of soil dehydrogenase (DHA) as an indicator of soil microbiological activity in two sites under different grazing managements in the arid Patagonian Monte. Materials and methods We selected two sites with different grazing managements: site G is currently under grazing disturbance and has been grazed by sheep since the beginning of the twentieth century, while site NG used to be grazed by sheep until 2003 (6 years before the first sampling) when sheep were gradually removed. Soil samples were collected at plant-covered patches (P) and inter-patches (IP) within G and NG at 7 sampling dates (distributed seasonally along a 2-year study), and in each sample we determined soil DHA. We further analyzed environmental properties that could have influenced the observed patterns of DHA by measuring soil moisture, soil penetration and gravel content, and plant litter biomass. Results and discussion In the grazed site, there was a significantly higher soil DHA activity in P than in IP along the whole study timeframe, while no significant differences were observed in soil DHA between P and IP in the non-grazed site. In both sites, soil DHA activity positively correlated with plant litter biomass. In addition, a significant positive correlation between DHA and soil penetration, and a significant negative correlation between DHA and gravel content were detected only in the grazed site. Although significant differences in soil DHA among dates were detected in both G and NG, this variable did not show a seasonal pattern. Conclusions These results suggest that grazing may increase soil DHA spatial heterogeneity, possibly associated with sheep-induced soil compaction through trampling and increased gravel content through erosion. The lack of significant differences in soil DHA activity between patches and inter-patches in the non-grazed site could be associated with vegetation not showing a clear impact on soil DHA in the time-frame elapsed since sheep-removal.
英文关键词	Dehydrogenase activity Microbial activity Soil microorganisms Vegetation
类型	Article
语种	英语
国家	Argentina
收录类别	SCI-E
WOS记录号	WOS:000513281900027
WOS关键词	ENZYME-ACTIVITY ; LIVESTOCK EXCLUSION ; MICROBIAL BIOMASS ; PLANT PHENOLOGY ; MONTE ; INDICATORS ; VEGETATION ; INTENSITY ; GRASSLAND ; COMMUNITY
WOS类目	Environmental Sciences ; Soil Science
WOS研究方向	Environmental Sciences & Ecology ; Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315078
作者单位	1.Laboratorio MicroBiol Biotecnol, Instituto Patagon Estudio Ecosistemas Continental, IPEEC,CONICET,CCT CONICET,CENPAT, Puerto Madryn, Argentina; 2.Laboratorio Ecol Pastizales, Instituto Patagon Estudio Ecosistemas Continental, IPEEC,CONICET,CCT CONICET,CENPAT, Puerto Madryn, Argentina; 3.Univers Nacl Patagonia San Juan Bosco, UNPSJB, Puerto Madryn, Argentina
推荐引用方式 GB/T 7714	Marcos, Magali S.,Carrera, Analia L.,Bertiller, Monica B.,et al. Grazing enhanced spatial heterogeneity of soil dehydrogenase activity in arid shrublands of Patagonia, Argentina[J],2020,20(2):883-888.
APA	Marcos, Magali S.,Carrera, Analia L.,Bertiller, Monica B.,&Olivera, Nelda L..(2020).Grazing enhanced spatial heterogeneity of soil dehydrogenase activity in arid shrublands of Patagonia, Argentina.JOURNAL OF SOILS AND SEDIMENTS,20(2),883-888.
MLA	Marcos, Magali S.,et al."Grazing enhanced spatial heterogeneity of soil dehydrogenase activity in arid shrublands of Patagonia, Argentina".JOURNAL OF SOILS AND SEDIMENTS 20.2(2020):883-888.