Fine root biomass and production regarding root diameter in Pinus densiflora and Quercus serrata forests: Soil depth effects and the relationship with net primary production

Authors : Seung Hyun HAN, Seongjun KİM, Hanna CHANG, Hyun-jun KİM, Jiae AN, Yowhan SON

Pages : 46-54

View : 13 | Download : 7

Publication Date : 2021-01-01

Article Type : Research Paper

Abstract :This study aimed to examine the effects of soil depth on fine root biomass insert ignore into journalissuearticles values(FRB); and production insert ignore into journalissuearticles values(FRP);, and determine the relationship between FRP and net primary production insert ignore into journalissuearticles values(NPP); across two root diameter classes insert ignore into journalissuearticles values(<1 and 1-2 mm); in Pinus densiflora and Quercus serrata forests. FRB and FRP were investigated from April 2016 to March 2017 using the soil sequential coring and ingrowth core methods. In P densiflora and Q. serrata forests, mean FRB < 1 mm insert ignore into journalissuearticles values(2.22 +/- 0.23 and 2.63 +/- 0.23 Mg hainsert ignore into journalissuearticles values(-1);); and annual FRP < 1 mm insert ignore into journalissuearticles values(0.97 +/- 0.09 and 1.55 +/- 0.16 Mg hainsert ignore into journalissuearticles values(-1);yearinsert ignore into journalissuearticles values(-1);); were higher than mean FRB 1-2 mm insert ignore into journalissuearticles values(0.63 +/- 0.12 and 1.72 +/- 0.38 Mg hainsert ignore into journalissuearticles values(-1);); and annual FRP 1-2 mm insert ignore into journalissuearticles values(0.26 +/- 0.14 and 0.20 +/- 0.06 Mg hainsert ignore into journalissuearticles values(-1);yearinsert ignore into journalissuearticles values(-1);); at 0-30 cm depth. Soil properties, such as soil moisture, organic matter, and inorganic nitrogen, decreased with soil depth insert ignore into journalissuearticles values(0-30 cm);. The gradient of soil properties corresponding with soil depth could directly and indirectly influence FRP <1 mm, resulting in higher FRB <1 mm and FRP <1 mm at topsoil insert ignore into journalissuearticles values(0-10 cm);. Additionally, only FRP <1 mm showed significant relationships with NPP and litter production. Although very fine roots insert ignore into journalissuearticles values(<1 mm in diameter); occupied a small percentage of NPP insert ignore into journalissuearticles values(7.5%);, they may be an important factor for predicting forest NPP, since NPP would be regulated by the capability of roots to absorb water and nutrients. Our findings indicate that finer roots are more sensitive to soil conditions than thicker roots, and they could he a forest productivity indicator.
Keywords : Environmental condition, productivity indicator, soil depth, very fine root