干旱区生态环境知识资源中心(Arid): Karst rocky desertification restoration increases soil inorganic N supply to reduce plant N limitation

Arid

DOI	10.1016/j.catena.2024.108012
	Karst rocky desertification restoration increases soil inorganic N supply to reduce plant N limitation
	Wen, Dongni; Huang, Yuanyuan; Huang, Yuanfei; Ding, Nana; Ni, Kang; Wang, Hua; Elrys, Ahmed S.; Meng, Lei; Zhu, Tongbin; Gessert, Alena; Mueller, Christoph
通讯作者	Meng, L ; Zhu, TB
来源期刊	CATENA
ISSN	0341-8162
EISSN	1872-6887
出版年	2024
卷号	241
英文摘要	Nitrogen (N) limitation of plant growth following vegetation restoration is widespread in global terrestrial ecosystems, especially in karst rocky desertification areas. However, neither the temporal changes in plant N limitation during the restoration of those areas nor the mechanisms underlying N availability are well understood. In this study, several indicators reflecting soil N availability, N transformation rates, and plant communities were investigated in four areas in southwest China differing in their grade of rocky desertification. Our results showed that plant growth was severely N limited in the intense rocky desertification areas. The plant community-level foliar N content, N-15 values, and N:P ratio increased significantly as the rocky desertification grade decreased, indicating a decrease in plant N limitation. This was attributed to increased soil N availability, evidenced by the higher soil delta N-15 values as well as total N and inorganic N contents along the rocky desertification grade. With the decreasing rocky desertification grade, the rates of organic N conversion to ammonium (NH4+) and nitrate (NO3-), the adsorption of NH4+ on cation-exchange sites, and the release of adsorbed NH4+ increased significantly, which could enhance soil inorganic N supply capacity and accelerate NH4+ turnover to increase N availability. Noticeably, the sharp decrease in the rate of NH4+ oxidation to NO3- with the decrease in the rocky desertification grade led to a shift in inorganic N from NO3--dominated to NH4+-dominated. The increased contents of soil organic matter, calcium, iron-aluminum oxides, and sand, the proportion of aggregates > 2 mm, as well as the greater abundances of fungi and bacteria were the primary drivers of the N transformation rates along the rocky desertification grade. Overall, our study highlights the importance of N cycling in controlling N availability and thus in determining plant N limitation in karst rocky desertification areas. The results of the study provide a scientific basis for the ecological restoration of rocky desertification in karst ecosystems.
英文关键词	Rocky desertification Nitrogen availability Plant N limitation Gross N transformation rates Soil microbial community
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001288178800001
WOS关键词	CHINA KARST ; NITROGEN ; CARBON ; ECOSYSTEMS ; VEGETATION ; FUNGI
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/2XILL650/403152
推荐引用方式 GB/T 7714	Wen, Dongni,Huang, Yuanyuan,Huang, Yuanfei,et al. Karst rocky desertification restoration increases soil inorganic N supply to reduce plant N limitation[J],2024,241.
APA	Wen, Dongni.,Huang, Yuanyuan.,Huang, Yuanfei.,Ding, Nana.,Ni, Kang.,...&Mueller, Christoph.(2024).Karst rocky desertification restoration increases soil inorganic N supply to reduce plant N limitation.CATENA,241.
MLA	Wen, Dongni,et al."Karst rocky desertification restoration increases soil inorganic N supply to reduce plant N limitation".CATENA 241(2024).