干旱区生态环境知识资源中心(Arid): Land use effects on gross soil nitrogen transformations in karst desertification area

Arid

DOI	10.1007/s11104-021-05021-9
	Land use effects on gross soil nitrogen transformations in karst desertification area
	Yang, Hui; Garousi, Farzaneh; Wang, Jun; Cao, Jianhua; Xu, Xingliang; Zhu, Tongbin; Mueller, Christoph
通讯作者	Zhu, TB (corresponding author), CAGS, Inst Karst Geol, Karst Dynam Lab, Mlr Guangxi 541004, Guilin, Peoples R China. ; Zhu, TB (corresponding author), Int Res Ctr Karst, Auspices UNESCO, Guilin 541004, Peoples R China.
来源期刊	PLANT AND SOIL
ISSN	0032-079X
EISSN	1573-5036
出版年	2021-06
英文摘要	Purpose Investigating soil nitrogen (N) cycling to evaluate inorganic N supply can guide land resource utilization. In this study, four typical land uses including grassland, Eucalyptus, corn, and pitaya plantations were chosen in a karst desertification area, all of which are the main plants in the local area. The corn and pitaya plantations experienced greater human disturbance than the grassland and Eucalyptus plantations; the latter two were not fertilized and tilled. We explored how land use change affects the gross N transformation rates and inorganic N supply in karst soils. Methods Soils were sampled from four land uses, and a (15) N-tracer incubation experiment containing two (15) N treatments ((NH4NO3)-N-15 and (NH4NO3)-N-15 at 10 atom% (15) N excess) was conducted at 25 degrees C under 60% water-holding capacity. Gross N transformation rates in the soils were qualified by a N cycle model (Muller et al., Soil Biol Biochem 39:715-726, 2007). Results Compared to grassland, pitaya cultivation did not affect heterotrophic nitrification (O-Norg) but increased the rates of the mineralization of organic N to NH4+ (M-Norg), NH4+ oxidation to NO3- (O-NH4), and microbial NO3- immobilization (I-NO3), resulting in increased inorganic N supply and turnover. By contrast, corn cultivation lowered the inorganic N supply by inhibiting M-Norg and O-NH4 rates, while increasing O-Norg. Compared to corn and pitaya plantations, the Eucalyptus plantation further lowered the inorganic N supply by inhibiting O-NH4 rates while increasing the rates of I-NH4 and NH4+ adsorption on cation-exchange sites. Lower clay content, alkyl-C, aromatic-C, alkyl-C/O-alkyl-C, and aromaticity levels but higher O-alkyl-C and carbonyl-C levels were found in the grassland and pitaya soils than the Eucalyptus and corn soils, indicating the clayey texture and low labile organic matter in the latter two soils. The rates of M-Norg, O-NH4, and I-NO3 were significantly negatively related to the soil clay content, alkyl-C/O-alkyl-C and aromaticity, suggesting that soil texture and the stability of organic matter were the important factors affecting inorganic N supply. Conclusions These results highlight the significant effect of land uses on N transformation rates. Compared to natural grassland, cash crop plantations such as pitaya can increase inorganic N supply capacity, while Eucalyptus and corn plantations reduce it, in karst rocky desertification areas. Our results indicate that the application of active organic fertilizer to agricultural plantations may be an effective practice for increasing labile organic C and improving the soil structure to accelerate N cycling and inorganic N supply.
英文关键词	Karst rocky desertification Land use (15) N-tracer Gross N transformation Inorganic N supply
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000659013600001
WOS关键词	AMMONIA-OXIDIZING ARCHAEA ; ORGANIC-MATTER ; HETEROTROPHIC NITRIFICATION ; TERRESTRIAL ECOSYSTEMS ; RETENTION CAPACITY ; CALCAREOUS SOIL ; FOREST SOILS ; INORGANIC N ; MINERALIZATION ; CARBON
WOS类目	Agronomy ; Plant Sciences ; Soil Science
WOS研究方向	Agriculture ; Plant Sciences
来源机构	中国科学院地理科学与资源研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/352425
作者单位	[Yang, Hui; Garousi, Farzaneh; Cao, Jianhua; Zhu, Tongbin] CAGS, Inst Karst Geol, Karst Dynam Lab, Mlr Guangxi 541004, Guilin, Peoples R China; [Yang, Hui; Garousi, Farzaneh; Cao, Jianhua; Zhu, Tongbin] Int Res Ctr Karst, Auspices UNESCO, Guilin 541004, Peoples R China; [Wang, Jun] Baise Univ, Guangxi Baise 533000, Baise, Peoples R China; [Xu, Xingliang] Chinese Acad Sci, Inst Geog Sci & Nat Resources, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China; [Mueller, Christoph] Justus Liebig Univ Giessen, Inst Plant Ecol, Heinrich Buff Ring 26, D-35392 Giessen, Germany; [Mueller, Christoph] Univ Coll Dublin, Sch Biol & Environm Sci, Dublin 4, Ireland; [Mueller, Christoph] Univ Coll Dublin, Earth Inst, Dublin 4, Ireland
推荐引用方式 GB/T 7714	Yang, Hui,Garousi, Farzaneh,Wang, Jun,et al. Land use effects on gross soil nitrogen transformations in karst desertification area[J]. 中国科学院地理科学与资源研究所,2021.
APA	Yang, Hui.,Garousi, Farzaneh.,Wang, Jun.,Cao, Jianhua.,Xu, Xingliang.,...&Mueller, Christoph.(2021).Land use effects on gross soil nitrogen transformations in karst desertification area.PLANT AND SOIL.
MLA	Yang, Hui,et al."Land use effects on gross soil nitrogen transformations in karst desertification area".PLANT AND SOIL (2021).