集约化管理是农业和林业生态系统中通过影响养分供应和土壤微生物群改善土壤质量和作物产量的常见做法;然而,在集约化管理的经济林中,土壤养分与细菌群落和功能能力之间的联系尚未得到很好的研究。在这项研究中,我们调查了土壤性质,如有效钾(AK),可用氮气(AN),有效磷(AP),铵(NH4+),硝酸盐(NO3-),有机质(OM),总氮(TN),总磷(TP),细菌多样性和群落组成,根茎根的潜在功能,和土壤微生物群贯穿密集管理的毛竹(Phyllostachysedulis)森林的时间序列。我们的结果表明,联合集约化管理(深耕,受精,和有机物质覆盖)在这项研究中导致AK浓度显着增加,AN,AP,NH4+,NO3-,OM,TN,TP(P<0.05)。然而,它们导致pH值显著降低(P<0.05)。这种变化降低了土壤和根茎根微生物群的Shannon多样性,但并未显着影响群落组成和功能能力。土壤细菌群落变异主要由土壤全钾(TK)介导(15.02%),其次是pH(11.29%)和AK(11.13%)。我们进一步观察到,Nitrosirae约占土壤pH值变化的50%,NO3-,NH4+,AK,表明其在土壤养分循环中的重要性,尤其是氮循环。因此,我们认为管理引起的土壤参数变化重塑了细菌群落结构和基石细菌组合,导致微生物功能的分化。
Intensive management is a common practice in agricultural and forestry ecosystems to improve soil quality and crop yield by influencing nutrient supply and soil microbiota; however, the linkage between soil nutrients and bacterial community and functional capacities in intensively managed economic forests has not been well studied. In this study, we investigated the soil properties such as available potassium (AK), available nitrogen (AN), available phosphorus (AP), ammonium (NH 4 + ), nitrate (NO 3 - ), organic matter (OM), total nitrogen (TN), total phosphorus (TP), bacterial diversity and community composition, potential functions of rhizome roots, and soil microbiota across a chronosequence of intensively managed Moso bamboo (Phyllostachys edulis) forests. Our results demonstrated that the combined intensive management (deep tillage, fertilization, and organic material mulching) in this study caused a significant increase in the concentrations of AK, AN, AP, NH 4 + , NO 3 - , OM, TN, and TP (P < 0.05). However, they led to a remarkable decrease in pH (P < 0.05). Such changes lowered the Shannon diversity of the soil and rhizome root microbiota but did not significantly affect the community composition and functional capacity. Soil bacterial community variation was predominantly mediated by soil total potassium (TK) (15.02%), followed by pH (11.29%) and AK (11.13%). We further observed that Nitrospirae accounted for approximately 50% of the variation in soil pH, NO 3 - , NH 4 + , and AK, indicating its importance in soil nutrient cycling, especially nitrogen cycling. Accordingly, we propose that the management-induced changes in soil parameters reshaped the bacterial community structure and keystone bacterial assemblage, leading to the differentiation of microbial functions.