Land use effects on gross soil nitrogen transformations in karst desertification area
Yang, Hui1,2; Garousi, Farzaneh1,2; Wang, Jun3; Cao, Jianhua1,2; Xu, Xingliang4; Zhu, Tongbin1,2; Mueller, Christoph5,6,7
Source PublicationPLANT AND SOIL
Corresponding AuthorZhu, Tongbin(zhutongbin@gmail.com)
AbstractPurpose 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.
KeywordKarst rocky desertification Land use (15) N-tracer Gross N transformation Inorganic N supply
Indexed BySCI
Funding ProjectNational Natural Science Foundation of China[41771340] ; National Natural Science Foundation of China[41877348] ; Guangxi Natural Science Foundation of China[2018GXNSFAA281026] ; Guangxi Natural Science Foundation of China[2018GXNSFAA294143] ; China Geological Survey Project[DD20190452] ; Guangxi Bagui Scholarship Program
Funding OrganizationNational Natural Science Foundation of China ; Guangxi Natural Science Foundation of China ; China Geological Survey Project ; Guangxi Bagui Scholarship Program
WOS Research AreaAgriculture ; Plant Sciences
WOS SubjectAgronomy ; Plant Sciences ; Soil Science
WOS IDWOS:000659013600001
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Document Type期刊论文
Corresponding AuthorZhu, Tongbin
Affiliation1.CAGS, Inst Karst Geol, Karst Dynam Lab, Mlr Guangxi 541004, Guilin, Peoples R China
2.Int Res Ctr Karst, Auspices UNESCO, Guilin 541004, Peoples R China
3.Baise Univ, Guangxi Baise 533000, Baise, Peoples R China
4.Chinese Acad Sci, Inst Geog Sci & Nat Resources, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China
5.Justus Liebig Univ Giessen, Inst Plant Ecol, Heinrich Buff Ring 26, D-35392 Giessen, Germany
6.Univ Coll Dublin, Sch Biol & Environm Sci, Dublin 4, Ireland
7.Univ Coll Dublin, Earth Inst, Dublin 4, Ireland
Recommended Citation
GB/T 7714
Yang, Hui,Garousi, Farzaneh,Wang, Jun,et al. Land use effects on gross soil nitrogen transformations in karst desertification area[J]. PLANT AND SOIL,2021:17.
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,17.
MLA Yang, Hui,et al."Land use effects on gross soil nitrogen transformations in karst desertification area".PLANT AND SOIL (2021):17.
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