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- Title
氮沉降对杉木幼树生物量及其分配的影响.
- Authors
杜旭龙; 余 恒; 高艳丽; 刘小飞; 黄锦学; 熊德成
- Abstract
To explore the effect of nitrogen deposition on evergreen conifers in the mid-subtropical zone, we conducted simulated atmospheric nitrogen deposition experiments in Sanming Forest Ecosystem National Observation and Research Station, Fujian Province. We devised three treatment conditions, namely control(CK, 0 kg·hm-2·a-1), low nitrogen(LN, 40 kg·hm-2·a-1), and high nitrogen(HN, 80 kg·hm-2·a-1). The response of plant biomass and its distribution to nitrogen deposition were analyzed in Chinese fir saplings. No significant differences in the leaf, bark, trunk, branch, root, aboveground part, and total biomass were observed between the CK and LN treatment groups(P>0.05), nor between the CK and HN treatment groups(P>0.05). However, the root biomass in the HN treatment was significantly greater than that in the CK treatment(P<0.05). No significant differences in the leaf, branch, bark, and trunk mass ratios were observed between the LN and CK treatments(P>0.05). Moreover, the mass, root leaf, and root shoot ratios increased significantly in the LN treatment(P<0.05), while the aboveground part mass ratio decreased(P<0.05). The leaf, branch, bark, trunk, aboveground part, and root mass ratios as well as the root shoot ratio did not differ significantly between the HN and CK treatments(P>0.05); however, the root leaf ratio increased significantly relative to that in the CK treatment(P<0.05). Leaf and branch biomass as well as leaf, branch, trunk, and aboveground part biomass exhibited a significant positive correlation under different nitrogen deposition treatments(P<0.01). Branch and trunk biomass were positively correlated under both CK and HN treatments, while showing a significant negative correlation under LN treatment(P<0.01). Aboveground part biomass and root biomass were positively correlated under CK treatment, but negatively correlated under LN and HN treatments(P<0.01). In conclusion, nitrogen deposition generally promoted the growth of Chinese fir saplings and increased biomass accumulation. The growth of Chinese fir saplings was maintained through the greater allocation of biomass to roots.
- Subjects
FUJIAN Sheng (China); ATMOSPHERIC nitrogen; PLANT biomass; ATMOSPHERIC deposition; FOREST reserves; BIOMASS; BARK
- Publication
Journal of Forest & Environment, 2023, Vol 43, Issue 5, p523
- ISSN
2096-0018
- Publication type
Article
- DOI
10.13324/j.cnki.jfcf.2023.05.010