摘要
为探讨氮沉降及蚯蚓添加对幼苗生态系统呼吸速率的影响,本研究于2017年6—9月在山西省灵空山自然保护区的苗圃地开展实验,利用LI-8100开路式土壤碳通量测量系统测定了模拟氮沉降(0、50、100 kg N·hm-2·a-1,分别表示为CK、LN、HN)与蚯蚓添加处理(未添加蚯蚓处理(A)和添加蚯蚓处理(B))下,油松(Pinus tabuliformis)和辽东栎(Quercus liaotungensis)幼苗生态系统的呼吸速率。结果表明:不同幼苗生态系统呼吸速率对氮沉降处理响应不同,氮沉降对油松幼苗生态系统呼吸速率影响不显著(P>0.05),而对辽东栎幼苗生态系统呼吸速率影响显著(P<0.01);无蚯蚓添加时在低氮和高氮条件下辽东栎幼苗生态系统呼吸速率分别增加了0.61%和3.65%,蚯蚓添加时在低氮和高氮条件下分别增加了6.67%和31.82%;蚯蚓对不同幼苗生态系统呼吸速率均表现为明显的促进作用,添加蚯蚓使油松幼苗(P<0.01)和辽东栎幼苗(P<0.05)生态系统呼吸速率在CK、LN、HN处理下分别增加了16.04%、40.86%、1.15%和0.31%、6.34%、27.57%;氮沉降与蚯蚓的交互作用(P<0.05),可促进幼苗生态系统呼吸速率;蚯蚓添加下,油松各N处理下的呼吸温度敏感系数Q10值有所升高,而辽东栎的Q10值均有降低;随着施氮量的增加,油松的Q10值呈现出先下降后上升的趋势,而辽东栎的Q10值呈现出先增大后减小的趋势。
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 and0.31%,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). Earthworm addition increased the temperature coefficients of respiration( Q10values)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.
作者
杨璐
赵博
陈平
赵秀海
YANG Lu;ZHAO Bo;CHEN Ping;ZHAO Xiu-hai(Key Laboratory for Forest Resources and Ecosystem Processes of Beijing, Beijing Forestry University,Beijing 100083,China)
出处
《生态学杂志》
CAS
CSCD
北大核心
2019年第1期44-50,共7页
Chinese Journal of Ecology
基金
国家自然科学基金项目(31340022)资助
关键词
氮沉降
土壤动物
幼苗
碳循环
温度敏感系数Q10
nitrogen deposition
soil fauna
seedling
carbon cycle
temperature coefficient Q10
作者简介
杨璐,男,1993年生,硕士研究生,主要从事森林生态学研究。E-mail:yanglu0108@163.com;通讯作者:赵秀海E-mail:zhaoxh@bjfu.edu.cn.
