3.1. the CVinter andCVintra of root system architecture traits
Interspecific variation (CV inter) can reflect the long-term adaptation of root system to the environment, while intraspecific variation (CV intra) is an important indicator of trait plasticity. The CV inter andCV intra are important ecological indicators. TheCV inter of RTD is the highest at 51.63%, while TI is the lowest at 5.92% (Table1). The CV intraranges of SRA, SRL, and RTD are relatively large, ranging from 11.77 to 75.76%, 14.02 to 86.51%, and 4.17 to 78.45%, respectively. However, the CV intra range of TI is the smallest, ranging from 0.30 to 10.62% (Fig. 3).
Table 1. Characteristics and interspecific variation coefficients of root system architecture of 47 annual ephemerals in desert of northern Xinjiang, China