Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing, China; Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, Southwest University, Chongqing, China.
Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, Chongqing Key Laboratory of Plant Ecology and Resources Research in Three Gorges Reservoir Region, School of Life Sciences, Southwest University, Chongqing, China.
Sci Total Environ. 2024 Jan 20;909:168532. doi: 10.1016/j.scitotenv.2023.168532. Epub 2023 Nov 14.
Moso bamboo invasion potentially alters litter, soil properties and soil microbial communities in forest ecosystems. However, the overall direction and magnitude of this alteration at a large spatial scale remain unclear. Here, we conducted a meta-analysis of 72 experimental studies on the impact of moso bamboo invasion on litter, soil physicochemical properties, and soil microbial communities. Overall, the moso bamboo invasion increased litter decomposition, soil pH, and NH-N, while concurrently leading to a decrease in soil bulk density, soil electrical conductivity, soil TN: TP ratio, soil NO-N, and available potassium. Moreover, we observed that the invasion significantly enhanced soil microbial biomass nitrogen, fungal ACE diversity index, fungal biomass, and bacterial Shannon diversity index, while decreasing the ratio of Gram-positive to Gram-negative bacteria and the biomass of Gram-positive bacteria. Furthermore, we identified the primary factors influencing specific soil properties and microbial community responses to moso bamboo invasion. Specifically, the response of NH-N, NO-N, soil bulk density, fungal diversity and pH were found to be primarily influenced by climatic factors (mean annual temperature, mean annual precipitation), topographic factors (aspect), and invasion stage, respectively. In addition, we further revealed a close relationship between soil physicochemical properties and microbial communities during moso bamboo invasion. Specifically, the response of soil microbial biomass nitrogen was positively correlated with the responses of soil organic nitrogen and total nitrogen content, Gram-positive bacteria biomass was positively correlated with soil total nitrogen but negatively correlated with soil pH. Meanwhile, soil bacterial diversity showed a significant positive correlation with soil pH but exhibited a negative correlation with soil SOC. Our study suggests that macro-climatic conditions, local microenvironment, and invasion stage co-regulate the important effects of moso bamboo invasion on litter, soil physicochemical properties, and microbial communities.
毛竹入侵可能会改变森林生态系统中的凋落物、土壤性质和土壤微生物群落。然而，在大尺度上，这种改变的总体方向和幅度仍不清楚。在这里，我们对 72 项关于毛竹入侵对凋落物、土壤理化性质和土壤微生物群落影响的实验研究进行了荟萃分析。总体而言，毛竹入侵增加了凋落物分解、土壤 pH 值和 NH-N，同时导致土壤容重、土壤电导率、土壤 TN:TP 比、土壤 NO-N 和有效钾降低。此外，我们观察到入侵显著增强了土壤微生物生物量氮、真菌 ACE 多样性指数、真菌生物量和细菌 Shannon 多样性指数，同时降低了革兰氏阳性菌与革兰氏阴性菌的比例和革兰氏阳性菌的生物量。此外，我们确定了影响特定土壤性质和微生物群落对毛竹入侵响应的主要因素。具体而言，NH-N、NO-N、土壤容重、真菌多样性和 pH 值的响应主要受气候因素（年平均温度、年平均降水量）、地形因素（方位）和入侵阶段的影响。此外，我们进一步揭示了毛竹入侵过程中土壤理化性质和微生物群落之间的密切关系。具体而言，土壤微生物生物量氮的响应与土壤有机氮和全氮含量的响应呈正相关，革兰氏阳性菌生物量与土壤全氮呈正相关，与土壤 pH 值呈负相关。同时，土壤细菌多样性与土壤 pH 值呈显著正相关，但与土壤 SOC 呈负相关。我们的研究表明，大气候条件、局部小环境和入侵阶段共同调节了毛竹入侵对凋落物、土壤理化性质和微生物群落的重要影响。
