历史性耕作促进了草-豆混合物的形成,并加速了土壤微生物活动和有机碳分解

IF 2.7 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Jiqiong Zhou, Jinchao Gong, Pengsen Wang, Yingying Su, Xuxu Li, Xiangjun Li, Lin Liu, Yanfu Bai, Congyu Ma, Wen Wang, Ting Huang, Yanhong Yan, Xinquan Zhang
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引用次数: 0

摘要

多年生牧草-豆科植物混合物已被广泛用于恢复退化草地,提高草地生产力和饲料质量。耕作对于草-豆混合物的苗床准备和可持续杂草管理至关重要。然而,人们普遍担心密集耕作可能会改变土壤特性,导致土壤有机碳(SOC)流失。我们研究了两种不同耕作强度(一次和两次)下以及围栏草地(FG)中长期多年生草-豆混合物的植物群落组成、SOC、土壤微生物生物量碳(MBC)、土壤酶活性和土壤特性。与围栏草地相比,建立草-豆混合物增加了植物物种多样性和植物群落覆盖率。与一次翻耕草地(OTG)相比,两次翻耕草地(TTG)将优质豆科牧草物种的覆盖率提高了 380.3%。与传统耕作法相比,草-豆科植物混合物降低了 SOC 和溶解有机碳 (DOC) 的浓度,而 OTG 和 TTG 的土壤 MBC 浓度分别增加了 16.0% 和 16.4%。与 FG 相比,TTG 使 N-乙酰基-β-D-葡萄糖苷酶(NAG)的活性明显降低了 72.3%,而 OTG 和 TTG 中的土壤酶 β-葡萄糖苷酶(βG)分别增加了 55.9% 和 27.3%。相关分析表明,MBC 和 βG 活性的增加与 SOC 的快速下降密切相关。这一结果表明,MBC 是土壤碳储量动态变化的关键驱动因素,有可能加速土壤碳循环,促进生物地球化学循环。建立草-豆混合物可有效提高饲料质量,促进植物多样性,从而促进退化草地的恢复。虽然耕作可以通过控制杂草来帮助建立豆科草混合物,但它会加速微生物的活动和有机碳的分解。我们的研究结果为了解退化草地恢复管理的过程和效果奠定了基础。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Historical tillage promotes grass-legume mixtures establishment and accelerates soil microbial activity and organic carbon decomposition

Perennial grass-legume mixtures have been extensively used to restore degraded grasslands, increasing grassland productivity and forage quality. Tillage is crucial for seedbed preparation and sustainable weed management for the establishment of grass-legume mixtures. However, a common concern is that intensive tillage may alter soil characteristics, leading to losses in soil organic carbon (SOC). We investigated the plant community composition, SOC, soil microbial biomass carbon (MBC), soil enzyme activities, and soil properties in long-term perennial grass-legume mixtures under two different tillage intensities (once and twice) as well as in a fenced grassland (FG). The establishment of grass-legume mixtures increased plant species diversity and plant community coverage, compared with FG. Compared with once tilled grassland (OTG), twice tilled grassland (TTG) enhanced the coverage of high-quality leguminous forage species by 380.3%. Grass-legume mixtures with historical tillage decreased SOC and dissolved organic carbon (DOC) concentrations, whereas soil MBC concentrations in OTG and TTG increased by 16.0% and 16.4%, respectively, compared with FG. TTG significantly decreased the activity of N-acetyl-β-D-glucosaminidase (NAG) by 72.3%, whereas soil enzyme β-glucosidase (βG) in OTG and TTG increased by 55.9% and 27.3%, respectively, compared with FG. Correlation analysis indicated a close association of the increase in MBC and βG activities with the rapid decline in SOC. This result suggested that MBC was a key driving factor in soil carbon storage dynamics, potentially accelerating soil carbon cycling and facilitating biogeochemical cycling. The establishment of grass-legume mixtures effectively improves forage quality and boosts plant diversity, thereby facilitating the restoration of degraded grasslands. Although tillage assists in establishing legume-grass mixtures by controlling weeds, it accelerates microbial activity and organic carbon decomposition. Our findings provide a foundation for understanding the process and effectiveness of restoration management in degraded grasslands.

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来源期刊
Journal of Arid Land
Journal of Arid Land ENVIRONMENTAL SCIENCES-
CiteScore
4.70
自引率
6.70%
发文量
768
审稿时长
3.2 months
期刊介绍: The Journal of Arid Land is an international peer-reviewed journal co-sponsored by Xinjiang Institute of Ecology and Geography, the Chinese Academy of Sciences and Science Press. It aims to meet the needs of researchers, students and practitioners in sustainable development and eco-environmental management, focusing on the arid and semi-arid lands in Central Asia and the world at large. The Journal covers such topics as the dynamics of natural resources (including water, soil and land, organism and climate), the security and sustainable development of natural resources, and the environment and the ecology in arid and semi-arid lands, especially in Central Asia. Coverage also includes interactions between the atmosphere, hydrosphere, biosphere, and lithosphere, and the relationship between these natural processes and human activities. Also discussed are patterns of geography, ecology and environment; ecological improvement and environmental protection; and regional responses and feedback mechanisms to global change. The Journal of Arid Land also presents reviews, brief communications, trends and book reviews of work on these topics.
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