The original data of microbial-mediated trade-offs between soil organic carbon accumulation and chemical stability during root stubble decomposition

A "winter fallow-rice" and "ryegrass-rice" rotation system was implemented in the experimental field for three years. After harvesting the ryegrass in March, the above-ground parts were removed, and the root stubble was ploughed under and left to decompose (FRD). The winter fallow treatment served as a control (FCK). Soil samples were collected at 0, 14, 28, 42, 56, and 70 days post-decomposition. Two treatments were applied in the pot experiment: root stubble decomposition of Italian ryegrass (RD) and no root stubble decomposition (CK). The root stubble of Italian ryegrass (‘Kuanye’) was collected by cutting 3 cm from the ground, washed, air-dried, and then cut into 5 cm sections for use. Fifty grams of ryegrass root stubble was placed into each pot based on the actual field biomass of ryegrass. For the CK treatment, empty nylon net bags were buried in the pots instead. Six sampling times were set at 0, 14, 28, 42, 70, and 98 d.本试验田实施为期三年的“冬闲-稻（winter fallow-rice）”与“黑麦草-稻（ryegrass-rice）”轮作种植体系。于每年3月收获黑麦草后，移除其地上部分，将根茬（root stubble）翻压入土使其自然腐解，该处理记为根茬腐解组（FRD）；以冬闲处理作为对照（FCK）。分别于腐解启动后的0、14、28、42、56和70 d采集土壤样品。盆栽试验设置两个处理：意大利黑麦草（Italian ryegrass）根茬腐解组（RD）与无根系腐解对照组（CK）。供试的意大利黑麦草品种为‘宽叶（Kuanye）’，采集时于离地面3 cm处割取，经清洗、风干后切成5 cm的小段备用。根据黑麦草的田间实际生物量，每盆施加50 g黑麦草根茬；对照组（CK）则在盆中埋入空尼龙网袋以替代根茬。本盆栽试验共设置6个采样时间点，分别为0、14、28、42、70和98 d。