species selection
4.The Fengshui woods at Wanshitou Village of Shishan Town is the well-conserved natural district secondary stand in Nanhai District.Study on its floristic composition and community structure is of great significance to the tree species selection and mixed types for the transformation from coniferous plantations into monsoon evergreen broad-leaved forest.
10.The binary and ternary stability constants of DL-α-Alaninc with Cu(Ⅱ),Zn(Ⅱ),Ni(Ⅱ) and Cd(Ⅱ) were determined by pH polcntiometric titration at 37±0.1℃ and ionic strength 150mM/dm3.Potentiomeinc data were treated with ZPLOT,MAGEC,MINIQUAD and ESTA programs. The compositions of complex species were ascertained in the complex equilibriums by selection of different chemical models.

