放牧和硒添加相互作用,影响青藏高原高寒草甸的植物生产力和物种多样性

IF 3.5 2区 农林科学 Q1 AGRICULTURE, MULTIDISCIPLINARY Annals of Agricultural Science Pub Date : 2024-06-01 DOI:10.1016/j.aoas.2024.07.003
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引用次数: 0

摘要

青藏高原(QTP)是世界上最大的连片牧区,而其土壤中对人体健康至关重要的稀有元素硒(Se)的含量却很低。放牧和添加硒是该地区草地的两种常见管理方法,但它们与青藏高原高山草甸植被生长的相互作用在很大程度上仍不为人所知。在此,我们进行了为期两年(2017 年和 2018 年)的田间试验,探讨放牧[两种放养率(0 和 6 个羊月公顷-1)]和添加 Se [六个 Se 添加水平(0、5、10、20、40 和 80 克公顷-1)]对东部瞿塘峡保护区玛曲县高山草甸地上生物量(AGB)、地下生物量(BGB)、根芽比(R/S)、物种丰富度和香农-维纳多样性指数的影响。结果表明,Se添加量为21克/公顷-1时,AGB达到峰值;Se添加量为20克/公顷-1时,AGB达到峰值;Se添加量为23.5克/公顷-1时,AGB达到峰值;Se添加量为23克/公顷-1时,AGB达到峰值;Se添加量为20克/公顷-1时,AGB达到峰值;Se添加量为23.5克/公顷-1时,AGB达到峰值;Se添加量为23克/公顷-1时,BGB达到峰值。添加 Se 后,放牧处理下高山草甸的物种丰富度和香农-维纳指数显著低于围封处理,这主要是由于莎草和草本植物的减少。结构方程模型表明,放牧减少了莎草、禾本科和草本植物的生物量,而添加Se增加了土壤可利用氮和磷的含量,促进了莎草、禾本科和草本植物的生长。我们的研究结果表明,适度放牧结合添加 Se 是维持高山草甸生产力的合适管理方法。
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Grazing and selenium addition interactively affect plant productivity and species diversity in an alpine meadow at the Qinghai−Tibet plateau

Qinghai−Tibetan Plateau (QTP) is the largest contiguous grazing area in the world, while its soil has a low soil selenium (Se) content, an essential rare element for human health. Grazing and Se addition are two common management practices in the regional grasslands, but their interactions with the vegetation growth of alpine meadows in the QTP remain largely unknown. Here, we conducted a two−year field experiment (2017 and 2018) to explore the effects of grazing [two stocking rates (0 and 6 sheep months ha−1)] and Se addition [six Se addition levels (0, 5, 10, 20, 40 and 80 g ha−1)] on above−ground biomass (AGB), below−ground biomass (BGB), root−to−shoot ratio (R/S), species richness and Shannon−Wiener's diversity index of an alpine meadow at the Maqu county in the Eastern QTP. The results indicate that AGB peaked at a Se addition rate of 21 g ha−1 combined with no grazing (i.e., exclosure) and at a rate of 20 g ha−1 Se addition with a stocking rate of 6 sheep months ha−1; BGB was highest under a Se addition of 23.5 g ha−1 (under exclosure) and 23 g ha−1 (under grazing). After Se addition, the species richness and Shannon−Wiener index of the alpine meadow under the grazing treatment were significantly lower than those in the exclosure treatment, which was mainly driven by the reduction of sedges and forbs. The structural equation model showed that grazing reduced the biomass of sedge, gramineae, and forbs, while Se addition increased the soil available nitrogen and phosphorus content and promoted the growth of sedge, gramineae, and forbs. Our results suggested that moderate grazing combined with Se addition is a suitable management method for maintaining alpine meadow productivity.

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来源期刊
Annals of Agricultural Science
Annals of Agricultural Science AGRICULTURE, MULTIDISCIPLINARY-
CiteScore
12.60
自引率
0.00%
发文量
18
审稿时长
33 days
期刊介绍: Annals of Agricultural Sciences (AOAS) is the official journal of Faculty of Agriculture, Ain Shams University. AOAS is an open access peer-reviewed journal publishing original research articles and review articles on experimental and modelling research at laboratory, field, farm, landscape, and industrial levels. AOAS aims to maximize the quality of the agricultural sector across the globe with emphasis on the Arabian countries by focusing on publishing the high-quality applicable researches, in addition to the new methods and frontiers leading to maximizing the quality and quantity of both plant and animal yield and final products.
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