Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architecture, South China Agricultural University, Guangzhou 510642, China.
Int J Mol Sci. 2024 Jan 23;25(3):1385. doi: 10.3390/ijms25031385.
Irrigation and fertilization are essential management practices for increasing forest productivity. They also impact the soil ecosystem and the microbial population. In order to examine the soil bacterial community composition and structure in response to irrigation and fertilization in a plantations, a total of 20 soil samples collected from Eucalyptus plantations were analyzed using high-throughput sequencing. Experimental treatments consisting of control (CK, no irrigation or fertilization), fertilization only (F), irrigation only (W), and irrigation and fertilization (WF). The results showed a positive correlation between soil enzyme activities (urease, cellulase, and chitinase) and fertilization treatments. These enzyme activities were also significantly correlated with the diversity of soil bacterial communities in plantations.. Bacteria diversity was considerably increased under irrigation and fertilization (W, F, and WF) treatments when compared with the CK treatment. Additionally, the soil bacterial richness was increased in the plantations soil under irrigation (W and WF) treatments. The Acidobacteria (38.92-47.9%), Proteobacteria (20.50-28.30%), and Chloroflexi (13.88-15.55%) were the predominant phyla found in the plantations soil. Specifically, compared to the CK treatment, the relative abundance of Proteobacteria was considerably higher under the W, F, and WF treatments, while the relative abundance of Acidobacteria was considerably lower. The contents of total phosphorus, accessible potassium, and organic carbon in the soil were all positively associated with fertilization and irrigation treatments. Under the WF treatment, the abundance of bacteria associated with nitrogen and carbon metabolisms, enzyme activity, and soil nutrient contents showed an increase, indicating the positive impact of irrigation and fertilization on plantations production. Collectively, these findings provide the scientific and managerial bases for improving the productivity of plantations.
灌溉和施肥是提高森林生产力的重要管理措施。它们还会影响土壤生态系统和微生物种群。为了研究灌溉和施肥对桉树人工林土壤细菌群落组成和结构的影响，本研究采用高通量测序技术分析了 20 个取自桉树人工林的土壤样本。实验处理包括对照（CK，不灌溉和施肥）、仅施肥（F）、仅灌溉（W）和灌溉施肥（WF）。结果表明，土壤酶活性（脲酶、纤维素酶和几丁质酶）与施肥处理呈正相关。这些酶活性与桉树人工林土壤细菌群落多样性也显著相关。与 CK 处理相比，灌溉和施肥处理（W、F 和 WF）下细菌多样性显著增加。此外，灌溉（W 和 WF）处理增加了桉树人工林土壤细菌丰富度。在桉树人工林土壤中，优势菌群为 Acidobacteria（38.92-47.9%）、Proteobacteria（20.50-28.30%）和 Chloroflexi（13.88-15.55%）。与 CK 处理相比，W、F 和 WF 处理下 Proteobacteria 的相对丰度显著较高，而 Acidobacteria 的相对丰度显著较低。土壤中总磷、速效钾和有机碳的含量均与施肥和灌溉处理呈正相关。在 WF 处理下，与氮和碳代谢、酶活性和土壤养分含量相关的细菌丰度增加，表明灌溉和施肥对桉树人工林生产力具有积极影响。总之，这些发现为提高桉树人工林生产力提供了科学和管理基础。
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