Long-term alfalfa (Medicago sativa L.) establishment could alleviate phosphorus limitation induced by nitrogen deposition in the carbonate soil

被引:8
|
作者
Song, Xin [1 ,2 ,3 ]
Fang, Chao [4 ]
Yuan, Zi-Qiang [1 ]
Li, Feng-Min [1 ,5 ]
Sardans, Jordi [2 ,3 ]
Penuelas, Josep [2 ,3 ]
机构
[1] Lanzhou Univ, Inst Arid Agroecol, Coll Ecol, State Key Lab Grassland Agroecosystems, 222 South Tianshui Rd, Lanzhou 730000, Gansu, Peoples R China
[2] UAB, Global Ecol Unit, CSIC, CREAF, Barcelona, Catalonia, Spain
[3] CREAF, Barcelona, Catalonia, Spain
[4] Nanjing Univ Informat Sci & Technol, Res Ctr Global Changes & Ecosyst Carbon Sequestrat, Sch Appl Meteorol, Nanjing 210044, Peoples R China
[5] Nanjing Agr Univ, Coll Agr, Nanjing 210095, Peoples R China
基金
中国国家自然科学基金;
关键词
Nitrogen deposition; Phosphorus limitation; Legume introduction; Plant-climate interactions; Hedley fraction; PLASTIC FILM MULCH; ATMOSPHERIC NITROGEN; ORGANIC-MATTER; P AVAILABILITY; LOESS PLATEAU; RESPONSES; BIOGEOCHEMISTRY; VEGETATION; TURNOVER; BIOMASS;
D O I
10.1016/j.jenvman.2022.116346
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Phosphorus (P) limitation is a widespread problem of primary production in dryland submitted to persistent nitrogen (N) deposition. The legume alfalfa (Medicago sativa L.), which can fix N2, might potentially strengthen P limitation in dryland ecosystems and is widely distributed as forage. However, there is still unclear how alfalfa grassland mobilizes the soil P to meet its demand. In this experiment, alfalfa introduction was used for long-term revegetation to evaluate the P uptake of plants from deep soil and assess the P limitation induced by N deposition compared with fallow. Our results showed that alfalfa introduction increased the soil P storage significantly at 0-2.4 m soil depth (+0.74 Mg ha -1), whereas it decreased at 2.4-4.8 m soil depth (-0.21 Mg ha -1) after 15-year establishment. Alfalfa establishment increased soil organic P concentration (180.9 mg kg -1 vs. 67.2 mg kg -1) and its relative contribution to total P (19.64% vs. 8.08%) at 0-4.8 m. Alfalfa establishment also increased the concentration and proportion of labile and intermediate P fractions at 0-4.8 m (9.12 mg kg -1 vs. 6.87 mg kg -1, 1.12% vs. 0.98%; 16.06 mg kg -1 vs. 8.39 mg kg -1, 1.69% vs. 1.17%). Alfalfa introduction decreased the concentrated HCl-Pi (250.66 mg kg -1 vs. 229.32 mg kg -1, 36.81% vs. 28.91%) in 2.4-4.8 m soil depth. These results indicated that the deep root system of alfalfa grassland could promote the P mobilization from deep to shallow soil. The concentrated HCl-Pi may be the main potential P source of alfalfa from 2.4-4.8 m to 0-2.4 m of soil depth, and long-term establishment of alfalfa can alleviate P limitation caused by N deposition in carbonate soil. Our results suggested that species with deep roots (such as alfalfa) could be selected as an economical way to mitigate nitrogen deposition in drylands.
引用
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页数:9
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