Abstract: To explore the effects of nitrogen (N) deposition and earthworm addition on seedling’s ecosystem respiratory rates, we used LI-8100 soil carbon flux measurement system to measure the ecosystem respiratory rates of Pinus tabuliformis andQuercus liaotungensis seedlings under simulated N deposition (0, 50, 100 kg N·hm^-2·a^-1, designated as CK, LN, HN respectively) and earthworm addition (no earthworm addition, A; earthworm addition, B) in the nursery located near Lingkong Mountain Nature Reserve, Shanxi Province from June to September in 2017. The results showed that the responses of ecosystem respiration rate of seedlings to N deposition differed between the two species. N deposition had no significant effects on the ecosystem respiration rate ofP. tabuliformis seedlings (P>0.05), but significantly affected that of Q. liaotungensis seedlings (P<0.01). In low LN and HN treatments, the ecosystem respiration rate of Q. liaotungensis seedlings increased by 0.61% and 3.65% respectively under no earthworm addition, and increased by 6.67% and 31.82% respectively under earthworm addition. Earthworm addition promoted the ecosystem respiration rate of P. tabuliformis(P<0.01)and Q. liaotungensis (P<0.05) seedlings, with increases of 16.04%, 40.86%, and 1.15% for P. tabuliformis and 0.31%, 6.34%, and 27.57% for Q. liaotungensis at CK, LN, and HN, respectively. N deposition interacted with earthworm addition to promote the ecosystem respiration rate of both species (P<0.05). arthworm addition increased the temperature coefficients of respiration (Q₁₀ values) of P. tabuliformis in various N addition treatments, while decreased that of Q. liaotungensis. The Q₁₀ values of P. tabuliformis were decreased and then increased with the increasing N level, while the Q₁₀ values of Q. liaotungensis were increased and then decreased with the increasing N level.

Key words: fish community, Haizhou Bay, interspecific association, interspecific relationship