Changes in soil phosphorus fractions following sole cropped and intercropped maize and faba bean grown on calcareous soil
Changes in soil phosphorus fractions following sole cropped and intercropped maize and faba bean grown on calcareous soil
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DOI：
10.1007/s11104-020-04460-0
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发表时间：
2020-02-21
期刊：
影响因子：
4.9
通讯作者：
Zhang, Fusuo
中科院分区：
文献类型：
--
作者：
Liao, Dan;Zhang, Chaochun;Zhang, Fusuo
目的研究玉米/蚕豆间作对土壤磷库动态变化的影响。方法在富磷土壤上种植玉米、蚕豆单作或间作。在不施磷1年（阶段I）和4年（阶段II）后，分别采集土壤样品，采用连续分级法分析土壤磷库。从2013年到2016年，每年测量植被生物量和P含量，以评估年度P平衡。结果玉米/蚕豆间作系统具有磷吸收优势，土地当量比（LER）在1.2 ~ 1.5之间。间作玉米和蚕豆4年平均地上部磷含量分别显著高于单作玉米和蚕豆29%和30%。在三年的磷耗竭期间，三种种植制度主要耗尽1 M HCl-P-i组分，其次是单一玉米，耗尽NaOH-P-i和浓缩HCl-P-o组分。单一蚕豆对碱溶性磷（NaHCO_3和NaOH提取）有耗竭作用，玉米/蚕豆间作对浓HCl-P-O有耗竭作用，与单一玉米的作用相似。结论单作和间作均以1 M HCl-P-i为主要耗竭对象，但P-o耗竭程度不同。单一的玉米和玉米/蚕豆间作耗尽了稍微不稳定的P-O组分，而单一的蚕豆耗尽了不稳定和中度不稳定的P-O组分。
Aims This study aimed to investigate the effects of coexistence with faba bean, a phosphorus (P)-efficient crop, on soil-accumulated P use by a maize/faba bean intercropping system on dynamic changes in soil P pool. Methods Maize and faba bean were grown in P-accumulated soil as either sole cropping or intercropping. After one year (Stage I) or four years (Stage II) of no P application, soil samples were collected respectively and analyzed for soil P pools using sequential fractionation. Aboveground biomass and P content were annually measured from 2013 to 2016 to assess the annual P balance. Results The intercropped maize/faba bean system showed a P-uptake advantage, with a Land Equivalent Ratio (LER) ranging from 1.2 to 1.5. The average shoot P content over the four years in intercropped maize and faba bean was significantly greater than that of the corresponding sole crops by 29% and 30%, respectively. Over the three-year P depletion period, the three cropping systems primarily depleted the 1 M HCl-P-i fraction, followed by sole maize, which depleted the NaOH-P-i and concentrated HCl-P-o fractions. Sole faba bean depleted the alkali-soluble P-o fraction (extracted by NaHCO3 and NaOH), and the intercropped maize/faba bean system depleted the conc. HCl-P-o fraction, which was similar to the effect of sole maize. Conclusions Both sole crops and intercrops mainly depleted 1 M HCl-P-i, but differed in P-o depletion. Sole maize and maize/faba bean intercropping depleted the sparingly labile P-o fraction, while sole faba bean depleted the labile and moderately labile P-o fractions.