Arsthbt

I'm new here and I only recently started to use LaTeX.

This is what I'm trying to achieve:

Notice the vertical lines and the oblique lines. Vertical lines represent headedness.

This is what I'm able to do:

This is the code:

documentclass[12pt]article
usepackage[usenames]color %used for font color
usepackageamssymb %maths
usepackageamsmath %maths
usepackage[utf8]inputenc %useful to type directly diacritic characters
usepackagetipa
usepackagetikz-qtree

begintikzpicture[baseline]
tikzsetfrontier/.style=distance from root=100pt
Tree
[.Pwd [.Ft [.$sigma$ [.æ ] ] [.$sigma$ [.l ] [.textipatextschwa ] ] ] [.Ft [.$sigma$ [.b ] [. æ ] ] [.$sigma$ [.m ] [.textipatextschwa ]] ] ]

endtikzpicture
enddocument

If you consider switching to forest, then you only need to set the appropriate calign keys. (forest has IMHO many advantages over tikz-qtree and is based on tikz, so you can use all tikz stuff, too.)

documentclassarticle
usepackage[edges]forest
usepackagetipa
begindocument
beginforest
for tree=parent anchor=south,where level=1calign=firstcalign=last
[Pwd 
 [Ft 
 [$sigma$ 
 [ae ] 
 ] 
 [$sigma$ 
 [l ] 
 [textipatextschwa 
 ] 
 ] 
 ] 
 [Ft 
 [$sigma$ 
 [b ] 
 [ae ] 
 ] 
 [$sigma$ 
 [m ] 
 [textipatextschwa 
 ]
 ] 
 ] 
]
endforest
enddocument

It is not so difficult with TIkZ's matrix:

documentclass[tikz]standalone
usepackagetipa
usetikzlibrarymatrix
begindocument
begintikzpicture
matrix (m) [matrix of nodes,nodes=minimum width=.8cm] %
 & & & & PWd & &\[2em]
 Ft & & & & Ft & &\[2em]
 $sigma$ & & $sigma$ & & $sigma$ & & $sigma$\[2em]
 `ae & l & textipatextschwa & b & 'ae & m & textipatextschwa\
;
draw (m-2-1.north) -- (m-1-5.south) -- (m-2-5.north);
draw (m-3-1.north) -- (m-2-1.south) -- (m-3-3.north);
draw (m-3-5.north) -- (m-2-5.south) -- (m-3-7.north);
draw (m-4-1.north) -- (m-3-1.south);
draw (m-4-2.north) -- (m-3-3.south) -- (m-4-3.north);
draw (m-4-4.north) -- (m-3-5.south) -- (m-4-5.north);
draw (m-4-6.north) -- (m-3-7.south) -- (m-4-7.north);
endtikzpicture
enddocument