Li Peng, Li Zhanbin, Tantai Zhan
Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China.
Ying Yong Sheng Tai Xue Bao. 2005 May;16(5):849-53.
The investigation on the vertical distribution characters of herbaceous vegetation root systems in abandoned and natural grasslands of Loess Plateau by the method of soil auger showed that there were no significant differences in root system distribution patterns between different sampling points, and the related root indexes could be used to indicate the vertical distribution characters of vegetation roots. The main root indexes including root biomass and root length were decreased with increasing soil depth, but increased with increasing abandoned years. After abandoned for more than 20 years, the root distribution characters of abandoned grassland were approached to that of natural grassland. The root extinction coefficient decreased with increasing abandoned years, indicating that more and more roots were concentrated in surface soil layer with the increase of abandoned time, which was helpful to the improvement of soil physical and chemical properties, and beneficial to the new species intrusion and vegetation succession.
采用土钻法对黄土高原弃耕地和天然草地草本植被根系垂直分布特征进行调查，结果表明不同采样点根系分布格局无显著差异，相关根系指标可用于指示植被根系垂直分布特征。包括根生物量和根长在内的主要根系指标随土壤深度增加而降低，但随弃耕年限增加而增加。弃耕20多年后，弃耕地根系分布特征接近天然草地。根系消光系数随弃耕年限增加而降低，表明随着弃耕时间的增加，越来越多的根系集中在表层土壤中，这有利于土壤理化性质的改善，利于新物种入侵和植被演替。
