羊草草原植被监测方法的比较研究

Comparative Study on the Sampling Methods of the Leymus chinensis Grassland of Inner Mongolia Autonomous Region

在草原长期生态监测和研究过程中,观测方法的一致性和可比性是保证数据质量及其控制的关键环节,预防观测误差比纠正误差要容易得多。因此,选择什么样的取样方法,在现代标准化和网络化的监测和研究活动中至关重要。通过对两种样线法、巢式样方法和1m×1m样方法等4种方法监测羊草草原植物物种丰富度和生产力的比较研究发现,在草原植被监测,尤其是长期监测过程中,宜将物种丰富度的监测与生产力的监测分离开来。在以物种丰富度为监测目的时,样线法为宜,最小样线长度为400m;在以监测羊草草原群落地上生物量为目的时,1m×1m样方法为宜,最少样方数为10。这样既可以缩小长期固定监测样地的面积,又可以节省人力、物力和财力。

In the long-term monitoring and study of the Inner Mongolia grassland ecology,solid conclusions often follow standardized sampling methods and accurate statistics.The present study used two line transects,nest method,and quadrate method of 1m×1m to monitor the species richness and the productivity of the L.chinensis grassland.It is concluded that when monitoring the grassland vegetation,more particularly,for a long-term period,checking of the species richness should be separated from the monitoring of the grassland's aggregate productivity.When targeting the former,line transect method is a better choice and the minimum length of the line should be 400 m.When monitoring the L.chinensis grassland biomass quantity,1m × 1m quadrate method is better used and the least quadrate number should be 10.Thus,while only a limited long-term,fixed sampling plot is used,manpower,natural resources,and expenses are saved.