Li Tian-yu, Kang Feng-feng, Han Hai-rong, Gao Jing, Song Xiao-shuai, Yu Shu
Ying Yong Sheng Tai Xue Bao. 2015 Jul;26(7):2159-66.
Using litter bag method, we studied the responses of soil microbial biomass carbon (MBC), microbial respiration (MR) and microbial metabolic quotient (qCO2) in 0-5 cm, 5-10 cm and 10-20 cm soil layers to home-field advantage of Betula platyphlla and Quercus mongolica leaf litter decomposition in Liaoheyuan Nature Reserve, northern Hebei Province. The results showed that the contents of MBC in Betula platyphila and Quercus mongolica leaf litter treatments in home environment (Bh and Qh treatments) were significant higher than that in B. platyphlla and Q. mongolica leaf litter treatments in non-home environment (Ba and Qa treatments). There was no significant difference in MR between home and non-home environments. Response degree of MBC and MR to home-field advantage of different litter decomposition was inconsistent. The MBC of the different soil layers in Qa treatment fell by 39.6%, 34.9% and 33.5% compared to Qh treatment, respectively, and that in B. platyphlla treatment was decreased by 31.6%, 27.1% and 17.0%, respectively. MR of the different soil layers in Qa treatment accounted for 96.3%, 92.4% and 83.7% of Qh treatment, respectively, while MR in B. platyphila treatment was 99. 4%, 97. 3% and 101.3%, respectively. In contrast to MBC, qCO2 in soil showed a reverse pattern. Our study suggested that rich nutrients in soil enhanced microbial activity and weakened the conflict of nutrient uptake between plants and microorganisms, which led to the result that MBC and qCO2 had an obvious response to home-field advantage of litter decomposition, when litter decomposed in its home environment. There was a weak response between MR and home-field advantage of litter decomposition, because of influence of soil temperature, water content and their interaction. Furthermore, MBC, MR and qCO2 had a higher response degree to home-field advantage of Q. mongolica litter than B. platyphila litter, since lower quality litter exhibited higher home-field advantage of litter decomposition.
利用凋落物袋法，我们研究了河北省北部辽河源自然保护区0-5厘米、5-10厘米和10-20厘米土层中土壤微生物生物量碳（MBC）、微生物呼吸（MR）和微生物代谢商（qCO2）对白桦和蒙古栎凋落物在原生地分解的本土优势的响应。结果表明，在原生环境中白桦和蒙古栎凋落物处理（Bh和Qh处理）的MBC含量显著高于非原生环境中白桦和蒙古栎凋落物处理（Ba和Qa处理）。原生和非原生环境之间的MR没有显著差异。MBC和MR对不同凋落物分解的本土优势的响应程度不一致。与Qh处理相比，Qa处理不同土层的MBC分别下降了39.6%、34.9%和33.5%，白桦处理的MBC分别下降了31.6%、27.1%和17.0%。Qa处理不同土层的MR分别占Qh处理的96.3%、92.4%和83.7%，而白桦处理的MR分别为99.4%、97.3%和101.3%。与MBC相反，土壤中的qCO2呈现相反的模式。我们的研究表明，土壤中丰富的养分增强了微生物活性，减弱了植物和微生物之间养分吸收的冲突，这导致当凋落物在其原生环境中分解时，MBC和qCO2对凋落物分解的本土优势有明显响应。由于土壤温度、含水量及其相互作用的影响，MR与凋落物分解的本土优势之间的响应较弱。此外，MBC、MR和qCO2对蒙古栎凋落物分解的本土优势的响应程度高于白桦凋落物，因为质量较低的凋落物表现出较高的凋落物分解本土优势。
