How would L1 phonological awareness affect L2 morphological learning?

Hu (2010) examined the hypothesis that L1 phonological awareness (PA) plays a role in children’s ability to extract morphological patterns of English as L2 from the auditory input. PA refers to an individual’s awareness of the phonological structure, or sound structure of spoken words. The results show that the third-grade EFL learners revealed emergent sensitivity to the morphological cues in the input but failed in fully processing intraword variations. The learners with poorer L1 PA were likely to encounter difficulties in identifying morphological alternation rules and in discovering the syntactic properties of L2 morphology. In addition to L1 PA, L2 vocabulary knowledge also contributed significantly to L2 morphological learning.

According to this study, we could say that L1 PA is a predictor of L2 morphological learning.  But it's hard to imply this finding to any further questions such as what is the specific link between native and foreign language learning difficulties or how children develop implicit knowledge of the structure of words. I don't know what to comment, so just introduce how L1 phonological awareness affect L2 morphological learning here.

Hu(2010). Phonological bases for L2 morphological learning. Journal of Psycholinguistic Research, 39(4), 305-322.