Data supporting "Nonlinear responses of soil enzyme kinetics to nitrogen additions in Larix principis-rupprechtii plantation of North China"

This dataset supports the findings reported in the manuscript entitled "Nonlinear responses of soil enzyme kinetics to nitrogen additions in Larix principis-rupprechtii plantation of North China". It contains three CSV files describing soil physicochemical properties, soil extracellular enzyme kinetic parameters, and microbial phospholipid fatty acid (PLFA) profiles under seven nitrogen-addition treatments (N0, N5, N10, N20, N40, N80, and N160). The soil physicochemical dataset includes pH, soil water content (SWC), soil organic matter (SOM), total nitrogen (TN), total phosphorus (TP), ammonium nitrogen (NH4+-N), nitrate nitrogen (NO3--N), available phosphorus (AP), and total and available iron and molybdenum. The enzyme kinetics dataset contains the maximum reaction velocity (Vmax), Michaelis constant (Km), and catalytic efficiency parameter (Kcat) of β-glucosidase (BG), acid phosphatase (ACP), and β-1,4-N-acetylglucosaminidase (NAG). The PLFA dataset contains sample-level measurements of bacterial, fungal, actinomycete, Gram-positive bacterial, Gram-negative bacterial, and total PLFA abundances, together with the Gram-positive to Gram-negative bacterial ratio (G+/G−) and fungal to bacterial ratio (F/B). These data support the evaluation of soil biochemical and microbial responses to nitrogen addition.本数据集支撑发表于题为《华北地区华北落叶松（Larix principis-rupprechtii）人工林土壤酶动力学对氮添加的非线性响应》的学术手稿中的研究成果。本数据集包含3个CSV格式文件，分别记录了7种氮添加处理（N0、N5、N10、N20、N40、N80及N160）下的土壤理化性质、土壤胞外酶动力学参数以及微生物磷脂脂肪酸（PLFA，phospholipid fatty acid）谱图信息。 土壤理化数据集涵盖pH、土壤含水量（SWC，soil water content）、土壤有机质（SOM，soil organic matter）、全氮（TN，total nitrogen）、全磷（TP，total phosphorus）、铵态氮（NH4+-N）、硝态氮（NO3--N）、有效磷（AP，available phosphorus）以及总铁、有效铁、总钼与有效钼。酶动力学数据集包含β-葡萄糖苷酶（BG，β-glucosidase）、酸性磷酸酶（ACP，acid phosphatase）与β-1,4-N-乙酰氨基葡萄糖苷酶（NAG，β-1,4-N-acetylglucosaminidase）的最大反应速率（Vmax，maximum reaction velocity）、米氏常数（Km，Michaelis constant）及催化效率参数（Kcat，catalytic efficiency parameter）。PLFA数据集包含样本级别的细菌、真菌、放线菌、革兰氏阳性细菌（Gram-positive bacterial）、革兰氏阴性细菌（Gram-negative bacterial）及总PLFA丰度测定值，同时附带革兰氏阳性菌与革兰氏阴性菌比值（G+/G−）以及真菌与细菌比值（F/B）。上述数据可用于评估土壤生化特性与微生物群落对氮添加的响应。