Dynamic variation of root mechanical properties for annual wild herbaceous vegetations
The mechanical property of soil-root composite is closely related to that of vegetation roots. Through random sam-pling in field plot,the root parameters and mechanical properties of Setaria viridis and Echinochloa crus-galli which are common annual herbaceous vegetations in China are tested. The test results show that during the sampling period,as growth duration gets longer,the root diameter and root density parameters of Setaria viridis initially increased and then decreased; root diameter and root mass density of Echinochloa crus-galli decreased continuously, whereas the root content increased and followed by a de-crease. The average root diameter of Setaria viridis is smaller than that of Echinochloa crus-galli, but has larger root content, root mass density,root length density,single root tensile capacities and tensile strengths;The single root tensile capacity and ten-sile strength of Setaria viridis and Echinochloa crus-galli are strongly and positively correlated with root diameter in a power function and negatively correlated in a logarithmic function significantly respectively( P≤0.001). Other than roots bigger than 0.6 mm in diameter,single root tensile capacity and root tensile strength of both vegetations go up first and then go down with the growth duration. The test result is useful to further understanding the dynamic changes of the mechanical properties of soil-root composite.
Setaria viridisEchinochloa crus-galliroot tensile capacityroot tensile strengthroot density
国家科技期刊平台
NSTL
万方数据
维普
