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Soil inorganic nitrogen composition and plant functional type determine forage crops nitrogen uptake preference in the temperate cultivated grassland, Inner Mongolia

文献类型：期刊论文

作者Xu, Lijun2; Cheng, Shulan3; Fang, Huajun1,3; Xin, Xiaoping2; Xu, Xingliang1; Tang, Huajun2
刊名SOIL SCIENCE AND PLANT NUTRITION
出版日期2019-10-02
页码10
ISSN号0038-0768
关键词N uptake preference N-15 labeling plant functional type soil N availability temperate cultivated grassland
DOI10.1080/00380768.2019.1671777
通讯作者Cheng, Shulan(slcheng@ucas.ac.cn) ; Fang, Huajun(fanghj@igsnrr.ac.cn)
英文摘要Plant nitrogen (N)-acquisition strategy affects soil N availability, community structure, and vegetation productivity. Cultivated grasslands are widely established to improve degraded pastures, but little information is available to evaluate the link between N uptake preference and forage crop biomass. Here an in-situ N-15 labeling experiment was conducted in the four cultivated grasslands of Inner Mongolia, including two dicots (Medicago sativa and Brassica campestris) and two monocots (Bromus inermis and Leymus chinensis). Plant N uptake rate, shoot- and root biomass, and concentrations of soil inorganic-N and microbial biomass-N were measured. The results showed that the root/shoot ratios of the dicots were 2.6 to 16.4 fold those of the monocots. The shoot N concentrations of the dicots or legumes were 40.6% to 165% higher than those of the monocots or non-legumes. The four forage crops in the cultivated grassland preferred to uptake more NO3?-N than NH4+-N regardless of growth stages, and the NH4+/NO3? uptake ratios were significantly lower in the non-legumes than in the legumes (p < 0.05). Significant differences in the NH4+-N rather than NO3?-N uptake rate were observed among the four forages, related to plant functional types and growth stages. The NH4+ uptake rate in the perennial forages exponentially decreased with the increases in shoot-, root biomass, and root/shoot ratio. Also, the plant NH4+/NO3? uptake ratio was positively correlated with soil NH4+/NO3? ratio. Our results suggest that the major forage crops prefer to absorb soil NO3?-N, depending on soil inorganic N composition and belowground C allocation. The preferential uptake of NO3?-N by forages indicates that nitrate-N fertilizer could have a higher promotion on productivity than ammonium-N fertilizer in the semi-arid cultivated grassland.
WOS关键词NITRATE UPTAKE ; N UPTAKE ; AMMONIUM ; PRODUCTIVITY ; ACQUISITION ; REDUCTION ; DIVERSITY ; BIOMASS ; ROOTS ; LIGHT
资助项目National Key R&D Program of China[2016YFC0500603] ; National Key R&D Program of China[2017YFA0604802] ; National Key R&D Program of China[2017YFA0604804] ; National Key R&D Program of China[2016YFC0503603] ; National Natural Science Foundation of China[41703081] ; National Natural Science Foundation of China[41907036] ; National Natural Science Foundation of China[31770558] ; National Natural Science Foundation of China[41977041] ; Development Plan Program of State Key Basic Research[2015CB150803] ; CAS Strategic Priority Program[XDA2002040203] ; CAS Strategic Priority Program[XDA23060401] ; China agriculture research system[CARS-34] ; National Nonprofit Institute Research Grant of CAAS[647-53]
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology ; Agriculture
语种英语
出版者TAYLOR & FRANCIS LTD
WOS记录号WOS:000488391200001
资助机构National Key R&D Program of China ; National Natural Science Foundation of China ; Development Plan Program of State Key Basic Research ; CAS Strategic Priority Program ; China agriculture research system ; National Nonprofit Institute Research Grant of CAAS
源URL[http://ir.igsnrr.ac.cn/handle/311030/129632]  
专题中国科学院地理科学与资源研究所
通讯作者Cheng, Shulan; Fang, Huajun
作者单位1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Qianyanzhou Ecol Res Stn, Beijing, Peoples R China
2.Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Hulunber Grassland Ecosyst Observat & Res Stn, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Xu, Lijun,Cheng, Shulan,Fang, Huajun,et al. Soil inorganic nitrogen composition and plant functional type determine forage crops nitrogen uptake preference in the temperate cultivated grassland, Inner Mongolia[J]. SOIL SCIENCE AND PLANT NUTRITION,2019:10.
APA Xu, Lijun,Cheng, Shulan,Fang, Huajun,Xin, Xiaoping,Xu, Xingliang,&Tang, Huajun.(2019).Soil inorganic nitrogen composition and plant functional type determine forage crops nitrogen uptake preference in the temperate cultivated grassland, Inner Mongolia.SOIL SCIENCE AND PLANT NUTRITION,10.
MLA Xu, Lijun,et al."Soil inorganic nitrogen composition and plant functional type determine forage crops nitrogen uptake preference in the temperate cultivated grassland, Inner Mongolia".SOIL SCIENCE AND PLANT NUTRITION (2019):10.

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来源：地理科学与资源研究所

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