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首页> 外文期刊>Journal of soil & sediments >Effects of different long-term cropping systems on phosphorus adsorption and desorption characteristics in red soils
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Effects of different long-term cropping systems on phosphorus adsorption and desorption characteristics in red soils

机译：长期不同种植方式对红壤中磷吸附和解吸特性的影响

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Purpose Phosphorus (P) fertilizer has been applied in regions with red soils to ensure high crop yield. However, the supply of bioavailable P for crop plants is insufficient due to the strong adsorption and fixing behaviors in red soils. In this study, we explored P adsorption and desorption characteristics in red soils under different long-term cropping systems. We also analyzed how the cropping systems affect P adsorption and desorption through changing soil physicochemical properties under the experimental conditions. Materials and methods Eighteen red soil samples were collected at depths of 0-20 cm from six cropping systems (abandoned farmland, corn continuous cropping, taro continuous cropping, pea-corn rotation, canola-tobacco rotation, and walnut-tobacco intercropping for at least 10 years) in Miyi County, Sichuan Province, China. Soil physicochemical properties, zeta potentials, and P adsorption and desorption characteristics were evaluated. Results and discussion The P adsorption capacity of soils increased at a decreasing rate with increasing exogenous P concentration, while the P desorption capacity increased constantly; however, the change in the percentage of desorbed P had no clear trend. The soils under pea-corn rotation and taro continuous cropping had lower P adsorption capacities and higher P desorption capacities compared to those under the other cropping systems. The maximum P adsorption capacities (Q(m)) of pea-corn rotation and taro continuous cropping soils were 16.1% and 32.4% of abandoned farmland soil, while the corresponding desorption coefficients were 6.93 and 1.62 times higher than that of abandoned farmland soil, respectively. Soil available P (AP), cation exchange capacity (CEC), and clay content were positively correlated with a and readily desorbable P (RDP), while they were negatively correlated with Q(m) (P < 0.05); opposite trends were found in the sand content. In addition, the zeta potential of soil colloids decreased with increasing soil pH. Among the cropping systems, the absolute value of zeta potential was lowest for tobacco-walnut intercropping, while its isoelectric point was the highest, resulting in the highest P adsorption capacity. Conclusions The long-term cropping systems affect P adsorption and desorption characteristics and P availability in red soils by influencing soil physicochemical properties. The main factors driving the changes in P adsorption behavior were AP, CEC, free Fe oxides, and sand content, while AP, sand, and clay contents were the major factors for the P desorption.
机译：用途磷肥已在红壤地区施用，以确保高产。然而，由于在红壤中强烈的吸附和固着行为，农作物的生物利用磷供应不足。在这项研究中，我们探讨了不同长期种植体系下红壤中磷的吸附和解吸特性。我们还分析了在试验条件下，种植系统如何通过改变土壤理化特性来影响磷的吸附和解吸。材料和方法从至少六个种植系统（废弃农田，玉米连作，芋头连作，豌豆-玉米轮作，低芥酸菜-烟草轮作和核桃-烟草间作）中收集了18个红壤样品，深度为0-20厘米10年）在中国四川省密邑县。评价了土壤理化性质，ζ电势以及磷的吸附和解吸特性。结果与讨论随着外源磷浓度的增加，土壤对磷的吸附能力以降低的速率增加，而磷的解吸能力则不断增加。但是，解吸的P的百分比的变化没有明确的趋势。与其他种植方式相比，豌豆-玉米轮作和芋头连作的土壤具有较低的磷吸附能力和较高的磷解吸能力。豌豆-玉米轮作和芋头连作土壤的最大磷吸附量（Q（m））分别为废弃农田土壤的16.1％和32.4％，而相应的解吸系数分别为废弃农田土壤的6.93和1.62倍，分别。土壤有效磷（AP），阳离子交换能力（CEC）和黏土含量与α和易于解吸的磷（RDP）呈正相关，而与Q（m）呈负相关（P <0.05）;含沙量呈现相反的趋势。另外，土壤胶体的ζ电势随土壤pH的升高而降低。在种植体系中，烟-核桃间作的ζ电位绝对值最低，而等电点最高，因此P吸附量最高。结论长期耕作制度通过影响土壤理化特性，影响红壤中磷的吸附和解吸特性以及磷的有效性。影响P吸附行为变化的主要因素是AP，CEC，游离Fe氧化物和砂含量，而AP，砂和粘土含量是P解吸的主要因素。

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