当前位置: X-MOL 学术Soil Biol. Biochem. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Root litter diversity and functional identity regulate soil carbon and nitrogen cycling in a typical steppe
Soil Biology and Biochemistry ( IF 9.7 ) Pub Date : 2019-11-25 , DOI: 10.1016/j.soilbio.2019.107688
Jing Man , Bo Tang , Wen Xing , Yang Wang , Xuezhen Zhao , Yongfei Bai

Root litter decomposition is the dominant source of soil organic carbon (C) and nitrogen (N) in grasslands. Few studies, however, have explored the effect of root litter diversity on soil C and N cycling. This study investigated the effects of species diversity and functional traits of root litter on soil CO2 and N2O release, net ammonification, net nitrification, and net N mineralization based on a 56-day incubation of grassland soils with root litter mixtures containing one, two, or four native plant species. The increasing species richness of root litter decreased the cumulative CO2 and N2O release in the soil, but enhanced the net ammonification, nitrate immobilization, and N mineralization. Root litter diversity has a predominant non-additive antagonistic effect on the release of soil CO2 and N2O, and a synergistic effect on the net ammonification, nitrate immobilization, and N mineralization in the soil. The functional identity rather than functional diversity of root traits explains most of the variation in soil C and N cycling. A high C: N ratio and low concentrations of N, P, K, and Di-O-alkyl-C (characteristic of celluloses) were found to be key to the antagonistic effects associated with cumulative release of CO2 from the soil. For net N ammonification and mineralization, the synergistic effect was principally induced by the high levels of carbohydrate-C and N and the low C: N ratios in root litter mixtures. Our study highlights the role and mechanisms of increased root litter diversity in decreasing soil CO2 and N2O release and in increasing the net N mineralization via non-additive antagonistic and synergistic effects of dominant root traits.



中文翻译:

根凋落物的多样性和功能特性调节典型草原中土壤的碳和氮循环

凋落物分解是草原土壤有机碳(C)和氮(N)的主要来源。然而,很少有研究探讨根凋落物多样性对土壤碳和氮循环的影响。这项研究基于56天的草地土壤与含有1种根部凋落物混合物的温育,研究了根部凋落物的物种多样性和功能性状对土壤CO 2和N 2 O释放,净氨化,净硝化和净氮矿化的影响。 ,两个或四个本地植物物种。根凋落物物种丰富度的增加使累积CO 2和N 2减少O在土壤中释放,但增强了净氨化作用,硝酸盐固定作用和N矿化作用。根凋落物多样性对土壤CO 2和N 2 O的释放具有主要的非累加拮抗作用,并且对土壤中的净氨化作用,硝酸盐固定作用和氮矿化作用具有协同作用。根系性状的功能同一性而非功能多样性解释了土壤碳和氮循环的大部分变化。发现高的C:N比和低的N,P,K和Di-O-烷基-C浓度(纤维素的特性)是与CO 2累积释放相关的拮抗作用的关键从土壤。对于净氮的氨化和矿化作用,协同作用主要是由根凋落物混合物中高水平的碳水化合物-C和N以及低的C:N比引起的。我们的研究突出了增加根系凋落物多样性在减少土壤CO 2和N 2 O释放以及通过显性根系性状的非累加拮抗和协同效应增加净氮矿化中的作用和机理。

更新日期:2019-11-25
down
wechat
bug