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Estimation of fine root production, mortality and turnover with Minirhizotron in Larix gmelinii and Fraxinus mandshurica plantations

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Frontiers in Biology 2008年第4期3卷 496-506页

作者： Jianwei SHI Zhengquan WANG Shuiqiang YU Xiankui QUAN Yue SUN Shuxia JIA Li MEI School of Forestry Northeast Forestry UniversityHarbin 150040China

fine root turnover is a major pathway for carbon and nutrient cycling in forest ***,to estimate fine root turnover,it is important to first understand the fine root dynamic processes associated with soil resource availability and climate *** objectives of this study were:(1)to examine patterns of fine root production and mortality in different seasons and soil depths in the Larix gmelinii and Fraxinus mandshurica plantations,(2)to analyze the correlation of fine root production and mortality with environmental factors such as air temperature,precipitation,soil temperature and available nitrogen,and(3)to estimate fine root *** installed 36 Minirhizotron tubes in six monospecific plots of each species in September 2003 in the Mao’ershan Experimental Forest *** sampling was conducted every two weeks from April 2004 to April *** calculated the average fine root length,annual fine root length production and mortality using image data of Minirhizotrons,and estimated fine root turnover using three *** show that the average growth rate and mortality rate in *** were markedly smaller than in ***,and were highest in the surface soil and lowest at the bottom among all the four soil *** annual fine root production and mortality in *** were significantly higher than in *** fine root production in spring and summer accounted for 41.7% and 39.7% of the total annual production in *** and 24.0% and 51.2% in *** majority of fine root mortality occurred in spring and summer for *** and in summer and autumn for *** turnover rate was 3.1 a^(-1) for *** and 2.7 a^(-1) for *** regression analysis indicates that climate and soil resource factors together could explain 80% of the variations of the fine root seasonal growth and 95%of the seasonal *** conclusion,fine root production and mortality in ***

关键词： Larix gmelinii Fraxinus mandshurica fine root production fine root mortality fine root turnover Minirhizotron

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Variation patterns of fine root biomass, production and turnover in Chinese forests

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Journal of Forestry Research 2017年第6期28卷 1180-1189页

作者： Shaozhong Wang Zhengquan Wang Jiacun Gu School of Forestry Northeast Forestry UniversityHarbin 150040 People’s Republic of China

China's forests cover 208.3 million ha and span a wide range of climates and a large variety of forest types, including tropical, temperate, and boreal forests. However, the variation patterns of fine root (production, and turnover from the south to the north are unclear. This study summarizes fine root biomass (FRB), production (FRP) and turnover rate (FRT) in China's forests as reported by 140 case studies published from 1983 to 2014. The results showed that the mean values of FRB, FRP and FRT in China's forests were 278 g m(-2), 366 g m(-2) a(-1), and 1.19 a(-1), respectively. Compared with other studies at the regional or global scales, FRB in China's forests was lower, FRP was similar to estimates at the global scale, but FRT was much higher. FRB, FRP, and FRT in China's forests increased with increasing mean annual precipitation (MAP), indicating that fine root variables were likely related to MAP, rather than mean annual temperature or latitude. This is possibly due to the small variation in temperature but greater variation in precipitation during the growing season. These findings suggest that spatiotemporal variation in precipitation has a more profound impact on fine root dynamics in China's forests, and this will impact carbon and nutrient cycles driven by root turnover in the future.

关键词： fine root biomass fine root production fine root turnover Climate change

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fine roots Dynamics in Two Forest Strata of a Semi-Deciduous Forest in Northern Republic of Congo

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Open Journal of Forestry 2021年第3期11卷 192-205页

作者： Edgard Fleury Koula Mikieleko Yannick Enock Bocko Grace Jopaul Loubota-Panzou Jean Joël Loumeto Laboratoire de Biodiversité de Gestion des Ecosystèmes et de l’Environnement Université Marien N’GOUABI BP 69 Brazzaville République du Congo

The belowground biomass is represented by coarse and fine roots. Concentrated in the superficial horizons of the soil, the fine roots play a crucial role in the functioning of a forest ecosystem. However, studies on their dynamics in natural forests are almost non-existent in the Republic of Congo. Here, we estimated the biomass, production, turnover and fine root lifespan of two forest strata of a semi-deciduous forest: the Gilbertiodendron dewevrei (De Wild.) J. Léonard forest (GF) and the mixed forest (MF) of land. The ingrowth cores method was used to estimate the biomass, production, turnover and lifespan of fine roots. The results of this study revealed that the biomass, production and fine root turnover of the two forest strata studied significantly decreased with increasing soil depth, with an increase in lifespan. The annual fine root biomass of GF (2284.50 ± 37.62 and 1034.61 ± 14.52 ) was slightly lower than that of MF (2430.07 ± 40.68 and 1043.10 ± 11.75 ) in the 0-15 cm and 15-30 cm horizons, respectively. The annual production of fine roots from these latter horizons was respectively 1300.19 ± 32.17 and 539.18 ± 11.55 in GF and 1362.24 ± 39.59

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