Raw data of weeds count

Data collection for weed density was performed using a standardized 1 m × 1 m quadrat method. At each sampling point within the experimental plots, a quadrat was placed randomly on the ground in a defined area for observation. All weed species present within the quadrat were identified and counted separately as broadleaf or narrow-leaved weeds.本数据集的杂草密度数据采集采用标准化的1 m × 1 m样方（quadrat）法进行。在试验样地内的每个采样点，于划定区域内随机布设样方开展观测。对样方内出现的所有杂草物种分别进行鉴定，并按阔叶杂草与窄叶杂草两类分别计数。