干旱区生态环境知识资源中心(Arid): Functional genes related to N and P cycling in degraded and restored areas from Brazilian drylands

Arid

DOI	10.1016/j.apsoil.2024.105316
	Functional genes related to N and P cycling in degraded and restored areas from Brazilian drylands
	Silva, Danilo F.; Cardoso, Elke J. B. N.; Huang, Laibin; Erikson, Christian; Silva, Antonio M. M.; Araujo, Victor L. V. P.; Silva, Davila E. O.; Melo, Vania M. M.; Araujo, Ademir S. F.; Pereira, Arthur P. A.; Rodrigues, Jorge L. Mazza
通讯作者	Silva, DF
来源期刊	APPLIED SOIL ECOLOGY
ISSN	0929-1393
EISSN	1873-0272
出版年	2024
卷号	196
英文摘要	There has been widespread application of grazing exclusion in soil conservation, particularly in semiarid regions. However, it is unclear how grazing exclusion reduces the negative effects of overgrazing on functional genes related to essential nutrient cycles, such as N and P, in the Caatinga biome. This study evaluated the impact of long-term overgrazing and grazing exclusion on the soil microbial functional pools related to N and P cycling compared to native Caatinga soil. There were significant variations in the abundance of functional genes across the three areas (p < 0.05). In the dry season, both native and restored areas showed notably higher copy numbers per gram of dry soil of nifH and nirK genes (ranging from 4.90E+05 to 6.86E+06) compared to the degraded area (ranging from 2.88E+05 to 1.97E+06). Copy numbers of archaeal amoA, nirS, and nosZ genes exhibited no significant variation among areas, except for bacterial amoA, which was higher in the native area (similar to 5.43E+05). Similar results were observed in the rainy season; however, nirS gene abundance was higher in the degraded area (similar to 1.38E+08), and nosZ showed higher abundance in the native area (similar to 3.37E+05). The high abundance of nosZ and nirS genes, coupled with the concurrent lower levels of amoA and nifH genes associated with nitrification and biological nitrogen fixation in areas under desertification, indicates an augmented denitrification activity. This suggests an escalated degradation of organic nitrogen, potentially leading to reduced availability of N inputs for soil organisms. Consequently, It may exacerbate N losses within the soil. Overall, these findings underscore a potential imbalance in the N cycle, particularly during the dry season. The results also substantiate that restoration improved the soil properties highlighting the potential of grazing exclusion as a restoration strategy for degraded soils in the Caatinga biome.
英文关键词	Soil functions Microbial ecology N and P cycles Drylands
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001176919700001
WOS关键词	SOIL-NITROGEN ; EXTRACTION METHOD ; DIVERSITY ; ABUNDANCE
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/402886
推荐引用方式 GB/T 7714	Silva, Danilo F.,Cardoso, Elke J. B. N.,Huang, Laibin,et al. Functional genes related to N and P cycling in degraded and restored areas from Brazilian drylands[J],2024,196.
APA	Silva, Danilo F..,Cardoso, Elke J. B. N..,Huang, Laibin.,Erikson, Christian.,Silva, Antonio M. M..,...&Rodrigues, Jorge L. Mazza.(2024).Functional genes related to N and P cycling in degraded and restored areas from Brazilian drylands.APPLIED SOIL ECOLOGY,196.
MLA	Silva, Danilo F.,et al."Functional genes related to N and P cycling in degraded and restored areas from Brazilian drylands".APPLIED SOIL ECOLOGY 196(2024).