Study on Fine root biomass and C stock in a poplar plantation in loess plateau

doi:10.11924/j.issn.1000-6850.casb15080071

Abstract

Abstract: In order to explore fine root growth, turnover, and its contribution to soil C pool, vertical distribution, seasonal variation, annual production and C stock of fine roots (＜ 2 mm) were investigated in a poplar (Populus tomentosa) plantation in Taiyuan using sequential soil coring method and litter bag technique. The results showed that fine root biomass at 0-40 cm soil depth was 241.8 g/m2, and the live fine root biomass was 168.0 g/m2, roughly accounting for 69.5% of total biomass. Fine roots distributed mainly in 0-10 cm soil layer and decreased with soil depth. Furthermore, fine root biomass showed a clearly seasonal variation, with the highest occurring in August and the lowest in April. Annual decomposition of fine root was 35.3 g/m2, and annual mortality was 98.2 g/m2. Annual fine root production was estimated to be 216.6 g/m2, and annual turnover rate was 1.29 times/a. Total C stock of fine roots at 0-40 cm soil depth was 97.4 g?C/m2, and annual input to soil C pool was 39.6 g?C/m2 due to fine root mortality. Soil total N and soil water contents were main factors controlling vertical distribution of fine roots, while its seasonal variation was closely related to soil water content and climate characteristic. Since our study site was located in Loess Plateau, lower fine root production in this study resulted primarily from soil water shortage, which also affected fine root turnover and its C input to soil organic C pool.

CLC Number:

Q948.1

闫美芳, and . Study on Fine root biomass and C stock in a poplar plantation in loess plateau[J]. Chinese Agricultural Science Bulletin, 2015, 31(35): 146-151.

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