RA3 THESIS: The effect of Phytophthora ...

Fine root characteristics in kauri-dominated forests affected by Phytophthora agathidicida

2022

Yang J. 2022. Fine root characteristics in kauri-dominated forests affected by Phytophthora agathidicida. A thesis submitted in fulfilment of the requirements for the degree of Master of Environmental Science, University of Auckland. 77 p.

ABSTRACT

Fine roots (≤ 2 mm diameter) are a small but functionally important portion of belowground biomass in forest ecosystems, contributing to net primary productivity, carbon transfer, and nutrient cycling. Yet, fine roots are poorly quantified in Southern Hemisphere forests. Kauri (Agathis australis), an ecologically and culturally significant species, is threatened by the pathogen Phytophthora agathidicida (PA) which causes kauri dieback. Considering infection begins within living tissue of the fine roots, knowledge on fine roots is crucial to understanding tree responses to PA.