Moss-dominated biocrusts improve the structural diversity of underlying soil microbial communities by increasing soil stability and fertility in the Loess Plateau region of China
Moss-dominated biocrusts improve the structural diversity of underlying soil microbial communities by increasing soil stability and fertility in the Loess Plateau region of China
复制标题
中国黄土高原地区以苔藓为主的生物结皮通过提高土壤稳定性和肥力改善了底层土壤微生物群落的结构多样性
DOI：
10.1016/j.ejsobi.2019.103120
复制
发表时间：
2019-11-01
影响因子：
4.2
通讯作者：
Yang, Kai
中科院分区：
文献类型：
--
作者：
Bao, Tianli;Zhao, Yunge;Yang, Kai
生物土壤结皮在旱地生态系统中提供关键的生态系统服务，特别是土壤肥力和表面稳定性。土壤肥力与微生物群落之间的关系已经在生物结壳的演替阶段得到了证实，然而，土壤稳定性对微生物群落的影响却知之甚少。为此，我们研究了中国黄土高原半干旱气候条件下微生物群落、土壤稳定性和肥力随生物灰演替的变化以及苔藓盖度增加的生物壳土壤样品。用磷脂脂肪酸(PLFA)法测定微生物群的结构多样性。结果表明，苔藓演替后期土壤粘聚力(代表土壤稳定性)提高40%，有机质、全氮和速效氮含量分别是演替前期蓝藻的93%、8%和1.9倍。根据Shannon指数和Simpson指数计算的微生物多样性指数分别提高了1.80%和0.44%，苔藓生物壳的微生物生物量是蓝藻生物壳的3.1倍，0-2 cm土层的土壤性质和微生物群落的变化与生物壳相似。这些发现对于更好地了解生物结壳的功能和服务，并为旱地生态系统的生态系统过程提供预测具有重要意义。
Biological soil crusts (biocrusts) provide key ecosystem services in dryland ecosystems, especially soil fertility and surface stability. The relationships between soil fertility and microbial communities have been demonstrated with successional stages of biocrusts, however, the effects of soil stability on microbial communities are poorly understood. Thus, we investigated the changes in microbial communities, soil stability and fertility with biocrust succession and sampled soils with biocrusts with increasing moss coverage in a semiarid climate in the Loess Plateau of China. The phospholipid fatty acid (PLFA) method was used to determine the structural diversity of the microbial groups. The results showed that soil cohesion (which represented the soil stability) increased by 40%, and that the content of organic matter, total N and available N was 93%, 8% and 1.9 times greater in the later successional moss than in the early successional cyanobacteria. Consequently, the microbial diversity according to the Shannon and Simpson indices increased by 1.80% and 0.44%, respectively, and the microbial biomass was 3.1 times higher in the moss biocrusts than in the cyanobacteria biocrusts in biocrust layer, and the underlying 0-2 cm soil layer showed the similar changes of soil properties and microbial communities with biocrust layer. These findings are important for achieving a better understanding of the functions and services of biocrusts and provide a prediction for ecosystem processes in dryland ecosystems.