Clonal integration and phosphorus management under light heterogeneity facilitate the growth and diversity of understory vegetation and soil fungal communities
Clonal integration and phosphorus management under light heterogeneity facilitate the growth and diversity of understory vegetation and soil fungal communities
复制标题
光异质性下的克隆整合和磷管理促进林下植被和土壤真菌群落的生长和多样性
DOI：
10.1016/j.scitotenv.2020.144322
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发表时间：
2021
影响因子：
9.8
通讯作者：
Wang Yong-Jian
中科院分区：
文献类型：
--
作者：
Bai Yan-feng;Shi Xue-Ping;Song Ping;Liu Yuan-Yuan;Zhang Zhuo-Wen;Zheng Bo;Jiang Chun-Qian;Wang Yong-Jian
许多森林林下层都存在光和养分缺乏的空间异质性。对不良森林进行适当的施肥管理有利于森林林下多样性，提高退化土壤的稳定性；克隆整合是许多森林林下植被（例如蕨类植物）资源共享的主要优势。在本研究中，我们测试了光异质性下的林下土壤施肥和克隆整合是否能够提高自然界林下植被和土壤微生物群落的性能和多样性。在中国东南部典型常绿森林的林下进行了添加或不添加磷（P）、完整或切断根茎、均匀或异质光环境下的田间试验。光异质性、磷添加和克隆整合促进了试验小区和斑块水平上蕨类植物和土壤微生物生物量C、N和P（MBC、MBN和MBP）的生长、多样性和均匀性。他们还增加了斑块水平土壤真菌群落的 Chao1 丰富度和香农多样性，特别是在添加磷的高光斑块中。异质光下，磷添加和克隆整合对蕨类植物生长和多样性以及土壤微生物量的积极影响大大增加。克隆整合对生长的积极影响在异质高光斑块中最大。此外，磷添加和克隆整合的相互作用增加了土壤MBN和MBP。克隆整合促进了异质光环境下蕨类植物和土壤MBC的生长和多样性的增加（9.35%–35.19%），并且在磷添加处理中增强了土壤MBN和MBP（9.03%–12.96%）。 P添加和克隆整合的相互作用在很大程度上导致了真菌类群从生长缓慢的寡营养型向快速生长的富营养型的转变。我们的研究结果表明，光异质性下克隆整合和/或P添加之间的相互作用增加了蕨类植物在富光斑块中的效益，并进一步促进了蕨类植物与土壤微生物群落的整合性能。
The spatial heterogeneity of light and nutrient deficiency occurs in many forest understories. Proper fertilization management of unhealthy forests can benefit forest understory diversity and improve the stability of degraded soil; and clonal integration is a major advantage of resource sharing for many forest understory vegetation, such as pteridophytes. In this study, we tested whether understory soil fertilization and clonal integration under light heterogeneity were able to increase the performance and diversity of understory vegetation and soil microbial communities in nature. Field experiments—with or without phosphorus (P) addition, with intact or severed rhizome, and under homogeneous or heterogeneous light environments—were conducted in the understory of a typical evergreen forest in southeast China.Light heterogeneity, P addition and clonal integration promoted the growth, diversity and evenness of ferns and soil microbial biomass C, N and P (MBC, MBN and MBP) at both experimental plot and patch level. They also increased Chao1 richness and Shannon diversity of soil fungal communities at patch level, especially in the high light patches with P addition. The positive effects of P addition and clonal integration on the growth and diversity of ferns and soil microbial biomass were greatly increased under heterogeneous light. The positive effects of clonal integration on the growth were the greatest in the heterogeneous high light patches. Moreover, the interactive effect of P addition and clonal integration increased soil MBN and MBP. Clonal integration promoted the increased growth and diversity of ferns and soil MBC in the heterogeneous light environment (9.35%–35.19%), and enhanced soil MBN and MBP in the P addition treatment (9.03%–12.96%). The interactive effect of P addition and clonal integration largely led to the transition of fungal groups from slow-growing oligotrophic types to fast-growing copiotrophic types.Our results show that the interactions between clonal integration and/or P addition under light heterogeneity increase the benefits of ferns in light-rich patches, and further promote integrative performance of ferns and soil microbial communities.