Wang Chun-Jing, Huang Shan-Feng, Wu Chu-Ping, Wang Gai-Ni, Wang Lei, Zhang Yong-Kun, Wan Ji-Zhong
Sichuan Academy of Forestry Chengdu China.
State Key Laboratory of Plateau Ecology and Agriculture Qinghai University Xining China.
Ecol Evol. 2024 Aug 12;14(8):e70128. doi: 10.1002/ece3.70128. eCollection 2024 Aug.
The relationship between aboveground biomass and plant diversity has been extensively examined to understand the role of biodiversity in ecosystem functions and services. Degraded grassland restoration projects can enhance carbon sequestration. However, the relationship between biomass and diversity remains one of the most actively debated topics regarding grassland ecosystems in degraded grassland restoration projects. We speculated that establishing the linear relationships between aboveground biomass and plant species diversity could contribute to enhancing the efficacy of degraded grassland restoration projects. This study sought to determine whether these relationships were linear during the initial stages of the restoration projects of degraded grasslands in Xing'an League, China. The investigations were based on an examination of seventy-six 1 × 1 m plots distributed among 15 areas in which the degraded grassland was at the initial stages of restoration. To quantify the species diversity of the degraded grassland communities, we used the species richness, Shannon-Wiener, inverse Simpson's reciprocal, and Pielou's evenness indices. Our analyses revealed that aboveground biomass had clear positive linear relationships with species richness during the initial stages of degraded grassland restoration. However, there were less pronounced associations with species diversity as assessed using the Shannon and inverse Simpson indices, based on regression models. Furthermore, weed biomass was found to have significant negative effects on species richness and Pielou's evenness. The weak linear relationship between aboveground biomass and species richness could be ascribed to an increase in weed biomass. We concluded that aboveground biomass and plant species diversity could be enhanced during the initial stages of degraded grassland restoration projects and suggest that the extent of weed biomass could serve as a key indicator of the efficacy of restoration from the perspective of plant species diversity and aboveground biomass in carbon sequestration projects.
为了解生物多样性在生态系统功能和服务中的作用，地上生物量与植物多样性之间的关系已得到广泛研究。退化草地恢复项目可以增强碳固存。然而，在退化草地恢复项目中，生物量与多样性之间的关系仍是草地生态系统中最受热议的话题之一。我们推测，建立地上生物量与植物物种多样性之间的线性关系有助于提高退化草地恢复项目的成效。本研究旨在确定在中国兴安盟退化草地恢复项目的初始阶段，这些关系是否呈线性。调查基于对分布在15个区域的76个1×1米样地的检查，这些区域的退化草地处于恢复的初始阶段。为了量化退化草地群落的物种多样性，我们使用了物种丰富度、香农-维纳指数、逆辛普森倒数指数和皮洛均匀度指数。我们的分析表明，在退化草地恢复的初始阶段，地上生物量与物种丰富度之间存在明显的正线性关系。然而，基于回归模型，与使用香农指数和逆辛普森指数评估的物种多样性之间的关联不太明显。此外，杂草生物量对物种丰富度和皮洛均匀度有显著的负面影响。地上生物量与物种丰富度之间较弱的线性关系可能归因于杂草生物量的增加。我们得出结论，在退化草地恢复项目的初始阶段，可以提高地上生物量和植物物种多样性，并建议从植物物种多样性和地上生物量在碳固存项目中的角度来看，杂草生物量的程度可以作为恢复成效的关键指标。
