不同林分对三七土壤质量的影响及其缓解连作障碍效应分析

Effects of different forest stands on soil quality of Panax notoginseng(Burk.) F. H. Chen and their role in mitigating continuous cropping barriers

  • 摘要: 目的 探讨不同林分对三七土壤质量及再植三七生长发育的影响,为三七的林下种植及连作障碍防控提供科学依据。方法 以采挖三七后自然晾置2年的土壤为对照组(CK),以采挖三七后分别种植2年华山松(HX)、侧柏(CX)和清香木(QX)的土壤为试验组,采用10%引入法引入不同处理土壤开展盆栽试验,测定不同林分处理再植三七的出苗率、存苗率、根腐病发病率及干重,同时测定土壤的理化性质、酶活性及代谢物组成,探讨不同林分处理对三七连作障碍的缓解效应。结果 与CK相比,HX、CX和QX处理再植三七的出苗率分别显著提高12%、25%和22%(P<0.05,下同),存苗率分别显著提高22%、32%和28%,发病率分别显著降低10%、10%和8%。此外,地上部分和地下部分单株干重显著增加,增幅分别为59%、30%、20%和44%、59%、26%。HX、CX和QX处理的土壤有机质和速效钾含量显著降低,碱解氮含量显著升高,且脲酶、蔗糖酶和过氧化氢酶活性显著增强。土壤代谢物差异分析结果表明,从不同处理土壤样本中共检测出56种代谢物,分为9个类别,共筛选出33种差异代谢物,主要为有机酸及其衍生物、有机含氧化合物、脂质及类脂分子。相关分析结果表明,不同林分处理的大多数差异代谢物与三七根腐病发病率和单株干重呈正相关。结论 不同林分处理通过改善土壤环境,促进了再植三七生长,并可通过调节土壤代谢物组成有效缓解再植三七的连作障碍。

     

    Abstract: Objective This study aimed to investigate the effects of different forest stands on soil quality and the growth and development of replanted Panax notoginseng (Burk.) F. H. Chen, so as to provide a scientific basis for its forest plantation and alleviating continuous cropping obstacles.Method Soil naturally air-dried for two years after Panax notoginseng (Burk.) F. H. Chen harvest was collected as control (CK), and soil in which Pinus armandii Franch. (HX), Platycladus orientalis (L.) Franco (CX), and Pistacia weinmannifolia J. Poisson ex Franch. (QX) were planted for 2 years after Panax notoginseng (Burk.) F. H. Chen harvest was used as the experimental groups. A pot experiment was conducted to introduce different treatments using a inoculation method of 10%. The emergence rate, survival rate, root rot incidence rate, and dry weight were determined; soil physicochemical properties, enzyme activities, and metabolite profiles were also assessed to investigate the effects of different forest stand treatments on obstacles in continuous cropping links for Panax notoginseng (Burk.) F. H. Chen.Result Compared with CK, HX, CX, and QX treatments significantly increased emergence rates of replanted Panax notoginseng (Burk.) F. H. Chen by 12%, 25%, and 22% (P<0.05, the same below), respectively, while survival rates increased by 22%, 32%, and 28%, and disease incidence rate decreased by 10%, 10%, and 8%. Moreover, the dry weight of aboveground per plant and the dry weight of belowground parts per plant increased significantly, by 59%, 30%, 20% and 44%, 59%, 26%, respectively. In the soil of HX, CX, and QX treatments, lower organic matter and available potassium content were significantly decreased, alkali-hydrolyzable nitrogen content was increased, and activities of urease, sucrase, and catalase were significantly enhanced. According to differential analysis of soil metabolites, 56 metabolites were detected and classified into nine categories, and 33 among them were identified as differential metabolites, which were mainly organic acids and their derivatives, oxygenated organics, lipids, and lipid-like compounds. Correlation analysis revealed that, under different forest stand treatments, the majority of these differential metabolites were positively correlated with root rot incidence rate and dry weight per plant of Panax notoginseng (Burk.) F. H. Chen.Conclusion Different forest stand treatments could improve soil environment, foster the growth of replanted Panax notoginseng (Burk.) F. H. Chen, and the continuous cropping obstacles of replanting Panax notoginseng (Burk.) F. H. Chen could be alleviated through regulating the composition of soil metabolites.

     

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