Changes in soil phosphorus fractions in response to long-term phosphate fertilization under sole cropping and intercropping of maize and faba bean on a calcareous soil

被引:26
作者
Liao, Dan [1 ]
Zhang, Chaochun [1 ]
Lambers, Hans [1 ,2 ]
Zhang, Fusuo [1 ]
机构
[1] China Agr Univ, Minist Educ MOE, Coll Resources & Environm Sci, Key Lab Plant Soil Interact, Beijing, Peoples R China
[2] Univ Western Australia, Sch Biol Sci, Inst Agr, Perth, WA, Australia
基金
欧盟地平线“2020”;
关键词
Long‐ term experiments; Maize; faba bean intercropping; P fertilizer; P fractionation; ORGANIC-MATTER; RHIZOSPHERE; DYNAMICS; L; COMPLEMENTARITY; AVAILABILITY; CULTIVATION; LEGUME; TRIALS; INPUT;
D O I
10.1007/s11104-021-04915-y
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Background and aims Understanding how soil phosphorus (P) fractions change is critical to achieve more efficient soil P use in a highly P-sorbing calcareous soil. Methods The fields were managed without or with annual P fertilizer (40 kg P ha(- 1)), continuously growing sole cropping or intercropping of maize and faba bean. Soil samples (0-200 mm) were collected at the start of the experiment and eight years later, and we evaluated P fractions using sequential fractionation. Results Maize/faba bean intercropping had an average land equivalent ratio (LER) of 1.2, a similar P content as sole maize, while both acquired more P than sole faba bean. Compared with the original soil P fractions in 2009, three cropping systems, regardless of P fertilization, depleted the labile P pool (Resin-P and NaHCO3-P-i), while Residual-P and NaHCO3-P-o accumulated. Eight years of no P input showed sole maize mainly depleted NaOH-P-i and conc. HCl-P-i, sole faba bean depleting NaOH-P-o, while intercropping depleted the most abundant P fraction, 1 M HCl-P-i, in addition to NaOH-P-i. However, long-term P application caused the cropping systems to accumulate 1 M HCl-P-i while depleting the conc. HCl-P-o fraction; both sole faba bean and intercropping showed accumulation of NaOH-P-i, while depleting NaOH-P-o. Conclusions Long-term appropriate P input enhanced the mineralization of mod-labile and non-labile organic P and accumulation of mod-labile inorganic P. Sole maize consistently depleted inorganic P and sole faba bean without P input depleted organic P, while intercropping accessed P pools varying with P input.
引用
收藏
页码:589 / 600
页数:12
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