干旱区生态环境知识资源中心(Arid): Afforestation increases soil inorganic N supply capacity and lowers plant N limitation in subtropical karst areas

Arid

DOI	10.1016/j.geoderma.2024.116848
	Afforestation increases soil inorganic N supply capacity and lowers plant N limitation in subtropical karst areas
	Liu, Lijun; Zhu, Qilin; Yang, Lin; Elrys, Ahmed S.; Sun, Jianfei; Ni, Kang; Meng, Lei; Zhu, Tongbin; Mueller, Christoph
通讯作者	Zhu, TB
来源期刊	GEODERMA
ISSN	0016-7061
EISSN	1872-6259
出版年	2024
卷号	443
英文摘要	The positive effects of afforestation in karst rocky desertification areas are often limited by soil nitrogen (N) availability. However, how plant N limitation evolves in response to prolonged afforestation as well as the mechanisms underlying plant N limitation and soil N availability are poorly understood. In this study, plant leaves and soil samples were collected from cropland, Dodonaea viscosa plantations 10, 20 and 40 years after their establishment on abandoned cropland in a karst rocky desertification area. The natural succession of shrubland served as the control. Foliar N/phosphorus (P) stoichiometry was used to evaluate plant N limitation, and the N concentration and delta 15N value of foliar and soil were measured to evaluate the changes in soil N availability. Soil N transformation rates were also determined, using 15N tracing technique to elucidate the mechanism underlying soil inorganic N availability. The plant community-level foliar N/P ratio (13.5) was lower than 14 following 10-y afforestation, indicating that plant growth is predominantly N limited. With the prolonged afforestation, the plant community-level foliar N/P ratio increased to 14.0-15.5, suggesting decreased plant N limitation. This could be attributed to increased soil N availability confirmed by the raises in the N concentration and delta 15N of plant community-level foliar and soil delta 15N with prolonged afforestation. Compared to cropland, D. viscosa afforestation increased the soil inorganic N supply capacity, by stimulating organic N mineralization, heterotrophic nitrification and the release of adsorbed ammonium, more obviously with prolonged afforestation. The rates of mineralization, heterotrophic nitrification and the release of adsorbed ammonium correlated significantly and positively with the plant community-level foliar N concentration, N/P ratio, and delta 15N, indicating that a larger soil inorganic N supply alleviates plant N limitation. This effect can be attributed to the increases in organic matter content, bacterial and fungal abundances and soil structure improvement following afforestation, all of which facilitate mineralization and heterotrophic nitrification. However, plant N limitation after 40 years of afforestation still exists, suggesting that monoculture afforestation may need to be adapted to maximize soil N availability and to alleviate plant N limitation in karst rocky desertification areas.
英文关键词	Afforestation Karst Plant community -level foliar N/P ratio Plant N limitation Soil N availability
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001201899100001
WOS关键词	TERRESTRIAL ECOSYSTEMS ; PHOSPHORUS LIMITATION ; MICROBIAL COMMUNITIES ; NITROGEN LIMITATION ; FOLIAR DELTA-N-15 ; ORGANIC-MATTER ; STOICHIOMETRY ; MECHANISMS ; RETENTION ; RECOVERY
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/2XILL650/403922
推荐引用方式 GB/T 7714	Liu, Lijun,Zhu, Qilin,Yang, Lin,et al. Afforestation increases soil inorganic N supply capacity and lowers plant N limitation in subtropical karst areas[J],2024,443.
APA	Liu, Lijun.,Zhu, Qilin.,Yang, Lin.,Elrys, Ahmed S..,Sun, Jianfei.,...&Mueller, Christoph.(2024).Afforestation increases soil inorganic N supply capacity and lowers plant N limitation in subtropical karst areas.GEODERMA,443.
MLA	Liu, Lijun,et al."Afforestation increases soil inorganic N supply capacity and lowers plant N limitation in subtropical karst areas".GEODERMA 443(2024).