Sun Hongping, Hu Wenyu, Dai Yuxin, Ai Lin, Wu Min, Hu Jing, Zuo Zhen, Li Mengyao, Yang Hao, Ma Jiangming
Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education - Guangxi Key Laboratory of Landscape Resources Conservation and Sustainable Utilization in Lijiang River Basin, Guilin, China.
College of Life Science, Guangxi Normal University, Guilin, China.
Front Microbiol. 2023 Feb 21;14:1111498. doi: 10.3389/fmicb.2023.1111498. eCollection 2023.
Moso bamboo ( (Carrière) J. Houz.), the most widely distributed economic bamboo species in southern China, can easily invade adjacent communities due to its clonal reproduction. However, there is little information on the effects of its establishment and expansion to adjacent forest soil communities, particularly in planted forests.
We investigated the relationships between soil properties and the microbial community during bamboo invasion under different slope directions (shady or sunny slope) and positions (bottom, middle, or top slope), in three typical stand types (bottom: pure moso bamboo, middle: mixed stands of moso bamboo and Masson pine ( Lamb.), and top: pure Masson pine) in the Lijiang River Basin. This study aimed to explore the effects of key environmental factors on soil microbial composition, diversity, and abundance.
The results showed that the abundance of bacterium and bacterium 13_2_20CM_58_27, and bacterium decreased as the slope increased ( < 0.05), whereas the abundance of bacterium, bacterium, , and increased as the slope increased ( < 0.05). However, the difference of slope direction on microbial communities was not significant. The pH, organic matter (OM) and total phosphorus (TP) were the key soil environmental factors; most microorganisms ( bacterium, bacterium, bacterium SCGC_AG - 212 - J23, bacterium, bacterium 13_2_20CM_2_66_6, and bacterium) showed a positive relationship with pH and a negative relationship with OM and TP. Slope position significantly affected OM, calcium (Ca), total nitrogen (TN), available phosphorus (AP), hydrolyzed nitrogen (HN), pH, and microbial abundance and composition. Slope direction significantly affected TP and magnesium (Mg). The structural equations also indicated that slope position had an effect on microbial composition, abundance, and diversity. Slope position was negatively correlated with pH ( -0.333, = 0.034) and positively correlated with OM ( 0.728, < 0.001), TN ( 0.538, < 0.001) and Ca ( 0.672, < 0.001); pH was positively correlated with microbial composition ( 0.634, < 0.001), abundance ( 0.553, < 0.001) and diversity ( 0.412, = 0.002), TN was positively correlated with microbial composition ( 0.220, = 0.014) and abundance ( 0.206, = 0.013), and Ca was negatively correlated with microbial composition ( -0.358, = 0.003) and abundance ( -0.317, = 0.003). Slope position can also influence microbial composition ( 0.452, < 0.001) directly. In addition, slope direction had an indirect effect on microbial diversity through total potassium (TK). Therefore, we proposed that the different variations in microbial community during bamboo invasion could be related to the influence of invasion on the soil properties at different invasion stages.
毛竹（(Carrière) J. Houz.）是中国南方分布最广的经济竹种，由于其克隆繁殖，很容易侵入邻近群落。然而，关于其建立和扩张对邻近森林土壤群落的影响，特别是在人工林中的影响，相关信息较少。
我们调查了漓江流域三种典型林分类型（底部：纯毛竹林，中部：毛竹与马尾松（Lamb.）混交林，顶部：纯马尾松林）在不同坡向（阴坡或阳坡）和坡位（坡底、坡中或坡顶）下竹子入侵过程中土壤性质与微生物群落之间的关系。本研究旨在探讨关键环境因素对土壤微生物组成、多样性和丰度的影响。
结果表明，随着坡度增加，细菌、13_2_20CM_58_27细菌和某细菌的丰度降低（P < 0.05），而某细菌、某细菌、某和某的丰度随着坡度增加而增加（P < 0.05）。然而，坡向对微生物群落的差异不显著。pH、有机质（OM）和总磷（TP）是关键的土壤环境因素；大多数微生物（细菌、某细菌、某细菌SCGC_AG - 212 - J23、某细菌、某细菌13_2_20CM_2_66_6和某细菌）与pH呈正相关，与OM和TP呈负相关。坡位显著影响OM、钙（Ca）、总氮（TN）、有效磷（AP）、水解氮（HN）、pH以及微生物丰度和组成。坡向显著影响TP和镁（Mg）。结构方程还表明坡位对微生物组成、丰度和多样性有影响。坡位与pH呈负相关（r = -0.333，P = 0.034），与OM呈正相关（r = 0.728，P < 0.001）、TN（r = 0.538，P < 0.001）和Ca（r = 0.672，P < 0.001）；pH与微生物组成（r = 0.634，P < 0.001）、丰度（r = 0.553，P < 0.001）和多样性（r = 0.412，P = 0.002）呈正相关，TN与微生物组成（r = 0.220，P = 0.014）和丰度（r = 0.206，P = 0.013）呈正相关，Ca与微生物组成（r = -0.358，P = 0.003）和丰度（r = -0.317，P = 0.003）呈负相关。坡位也可直接影响微生物组成（r = 0.452，P < 0.001）。此外，坡向通过全钾（TK）对微生物多样性有间接影响。因此，我们认为竹子入侵过程中微生物群落的不同变化可能与入侵在不同入侵阶段对土壤性质的影响有关。
