Effects of Grazing Exclusion on the Temporal Stability of Aboveground Biomass of Sagebrush Desert Grassland

doi:10.11733/j.issn.1007-0435.2023.04.026

Acta Agrestia Sinica ›› 2023, Vol. 31 ›› Issue (4): 1163-1172.DOI: 10.11733/j.issn.1007-0435.2023.04.026

Effects of Grazing Exclusion on the Temporal Stability of Aboveground Biomass of Sagebrush Desert Grassland

YE Hua-wei¹, SUN Zong-jiu^1,2,3, LIU Hui-xia¹, Yu Bing-jie¹, LI Si-yuan¹

1. College of Grassland Science, Xinjiang Agricultural University, Urumqi, Xinjiang 830052, China;
2. Key Laboratory of Grassland Resources and Ecology of Western Arid Region, Ministry of Education, Urumqi, Xinjiang 830052, China;
3. Xinjiang Key Laboratory of Grassland Resources and Ecology, Urumqi, Xinjiang 830052, China

Received:2022-07-05 Revised:2023-01-16 Published:2023-04-28

封育对蒿类荒漠草地植被地上生物量时间稳定性的影响

冶华薇¹, 孙宗玖^1,2,3, 刘慧霞¹, 于冰洁¹, 李思媛¹

1. 新疆农业大学草业学院, 新疆乌鲁木齐 830052;
2. 西部干旱区草地资源与生态教育部重点实验室, 新疆乌鲁木齐 830052;
3. 新疆草地资源与生态自治区重点实验室, 新疆乌鲁木齐 830052

通讯作者: 孙宗玖,E-mail:nmszj@21cn.com
作者简介:冶华薇(1996-),女,回族,新疆乌鲁木齐人,硕士研究生,主要从事草地资源生态与利用研究,E-mail:1091882048@qq.com
基金资助:
国家自然科学基金项目(32060408)；新疆维吾尔自治区自然科学基金(2020D01A60)资助

Abstract

Abstract: To identify the temporal stability changes of aboveground biomass of grassland vegetation during the restoration of degraded grassland and the influencing factors,we measured the temporal stability of aboveground biomass and the asynchrony of species in the enclosure duration (2 a,4 a and 6 a),by using field sampling and indoor analysis on sagebrush desert grassland in the middle part of the northern slope of Tianshan Mountain. The results showed that the belowground biomass of sagebrush desert grassland did not change significantly after grazing exclusion,while the aboveground biomass increased 38.83%,136.26% and 87.21% (P<0.05) in 2 a,4 a and 6 a respectively,compared with the control. The abovegeround biomass temporal stability of community of sagebrush desert grassland communities increased by 38.36% (P<0.05) compared to the control in enclosure 2 a,while the changes were not significant in enclosure 4 a and 6 a;the species richness decreased by 46.15% and 15.93% (P<0.05) and species asynchrony decreased by 20.13% and 17.52% in enclosure 4 a and 6 a,respectively,compared to the control (P<0.05). Species richness was not significantly correlated with aboveground biomass temporal stability,but species asynchrony and dominant species temporal stability positively contributed to aboveground biomass temporal stability of community. Thus,grazing exclusion was beneficial to the aboveground biomass recovery of degraded sagebrush desert grassland,where species asynchrony and temporal stability of dominant species were key factors driving the aboveground biomass temporal stability of community.

Key words: Grazing exclusion, Sagebrush desert, Temporal stability, Species asynchrony

摘要： 为明确退化草地恢复过程中草地植被地上生物量时间稳定性变化及影响因素，以天山北坡中段蒿类荒漠草地为对象，采用野外取样和室内分析的方法，测算了封育年限间(2,4,6 a)群落地上生物量时间稳定性及物种异步性等，结果表明：封育2，4，6 a蒿类荒漠草地地上生物量较对照依次提高38.83%，136.26%，87.21%(P<0.05)。封育2 a蒿类荒漠草地群落地上生物量时间稳定性较对照增加38.36%(P<0.05)，而封育4，6 a则变化不显著；封育4，6 a蒿类荒漠草地物种丰富度较对照分别降低46.15%，15.93%(P<0.05)，物种异步性降低20.13%，17.52%(P<0.05)。物种丰富度与地上生物量时间稳定性无显著相关，但物种异步性及优势种时间稳定性对群落地上生物量时间稳定性有正向促进作用。因此，封育有利于退化蒿类荒漠草地植物地上生物量的恢复，物种异步性和优势物种时间稳定性是驱动群落地上生物量时间稳定性的重要因子。

关键词: 封育, 蒿类荒漠, 时间稳定性, 物种异步性

CLC Number:

S821.4+3

YE Hua-wei, SUN Zong-jiu, LIU Hui-xia, Yu Bing-jie, LI Si-yuan. Effects of Grazing Exclusion on the Temporal Stability of Aboveground Biomass of Sagebrush Desert Grassland[J]. Acta Agrestia Sinica, 2023, 31(4): 1163-1172.

冶华薇, 孙宗玖, 刘慧霞, 于冰洁, 李思媛. 封育对蒿类荒漠草地植被地上生物量时间稳定性的影响[J]. 草地学报, 2023, 31(4): 1163-1172.

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Effects of Grazing Exclusion on the Temporal Stability of Aboveground Biomass of Sagebrush Desert Grassland

封育对蒿类荒漠草地植被地上生物量时间稳定性的影响

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