Effects of Grazing Intensity on the Grassland Vegetation Community Characteristics in the Hilly Loess Plateau Region

doi:10.11733/j.issn.1007-0435.2022.04.005

Acta Agrestia Sinica ›› 2022, Vol. 30 ›› Issue (4): 810-817.DOI: 10.11733/j.issn.1007-0435.2022.04.005

Effects of Grazing Intensity on the Grassland Vegetation Community Characteristics in the Hilly Loess Plateau Region

SUN Hui¹, ZHAO Yun-ge², LIU Guang-liang⁴, GAO Li-qian², WANG Peng², MA Xin-xin², LI Wen³, XU Ming-xiang²

1. College of Forestry, Northwest A&F University, Yangling, Shaanxi Province 712100, China;
2. Institute of Soil and Water Conservation, Northwest A & F University, Yangling, Shaanxi Province 712100, China;
3. College of Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi Province 712100, China;
4. Wuqi County Returning Farmland to Forest Ecological (Forest) Park Management Office, Wuqi Shaanxi Province 717600, China

Received:2021-09-22 Revised:2021-10-11 Published:2022-04-25

放牧强度对黄土丘陵区草地植物群落特征的影响

孙会¹, 赵允格², 刘广亮⁴, 高丽倩², 王鹏², 马昕², 李雯³, 许明祥²

1. 西北农林科技大学林学院, 陕西杨凌 712100;
2. 西北农林科技大学水土保持研究所, 陕西杨凌 712100;
3. 西北农林科技大学资源与环境学院, 陕西杨凌 712100;
4. 吴起县退耕还林生态(森林)公园管理处, 陕西吴起 717600

通讯作者: 许明祥,E-mail:xumx@nwafu.edu.cn
作者简介:孙会(1989-),男,汉族,陕西榆林人,博士研究生,主要从事草地生态与利用研究,E-mail:sunhui21412@163.com
基金资助:
中国科学院"西部之光"交叉团队项目-重点实验室合作研究专项(2019);国家自然科学基金项目(41907056,41830758)资助

Abstract

Abstract: Large area of revegetated grassland was formed in the Hilly Loess Plateau region since the implementation of the project "Grain for Green" .Nowadays,how to sustainably manage this grassland became an important issue.Moderate grazing may benefit the natural regeneration and sustainable development of grassland vegetation communities,and increase the economic income.However,there are few studies focused on the issue in this area currently.Accordingly,this study investigated the effects of different grazing intensities (which was expressed in the goat's dung density in the study) on the characteristics of vegetation communities in the Hilly Loess Plateau region.The results showed that:(1) Light grazing (dung ball density was 0~10 individual·m^-2) promoted the development of vegetation communities in the revegetated grasslands.Compared with enclosed grassland,the average height,coverage,biomass,the Shannon-wiener index and the Margalef richness of the vegetation communities were increased by 39.8%,5.0%,26.0%,14.8% and 32.8%,respectively.(2) It led to the degradation of the vegetation community of the grassland when grazing exceeds a certain intensity (dung ball density was 10 individual·m^-2).The average height,coverage,biomass,Shannon-wiener index and the Margalef richness of the vegetation communities decreased by 48.0%,24.2%,63.1%,14.3% and 27.0% respectively compared with that of the enclosed grassland.(3) Under a certain grazing intensity (15~20 individual·m^-2),the dominance of standing and clumping living species in the community were decreased,while the dominance of rosettes and creeping species were increased,the grazing tolerance was therefore enhanced.The results would provide a reference for the sustainable management of a large-scale revegetated grassland in this area.

Key words: Graze, Dung ball density, Vegetation community, Species composition, Biomass, Diversity

摘要： 退耕还林(草)工程实施后,黄土丘陵区形成大面积草地,该草地的可持续管理备受关注。适度放牧可能有利于草地植物群落的自然更新及可持续发展,同时可增加经济收入,但该区鲜见相关报道。为此,本文以该区20年以上退耕草地为研究对象,通过野外调查,研究了不同放牧强度(以单位面积羊粪球数量表征)对草地植物群落特征的影响。结果表明:轻度放牧(粪球密度为0~10个·m^-2)可促进退耕草地植物群落发育,群落平均高度、盖度、生物量、Shannon-Wiener指数和Margalef指数较封禁草地分别增加了39.8%,5.0%,26.0%,14.8%和32.8%。放牧超过一定强度(粪球密度大于10个·m^-2)将导致退耕草地植物群落退化,群落平均高度、盖度、生物量、Shannon-Wiener指数和Margalef指数较封禁草地分别降低了48.0%,24.2%,63.1%,14.3%和27.0%。在一定放牧强度(15~20个·m^-2)下植物群落中直立、丛生生活型物种优势度降低,莲座和匍匐生活型物种优势度增加,耐牧性增强。本研究可为黄土丘陵区大面积退耕草地的可持续管理提供参考。

关键词: 放牧, 粪球密度, 植被群落, 物种组成, 生物量, 物种多样性

CLC Number:

S153

SUN Hui, ZHAO Yun-ge, LIU Guang-liang, GAO Li-qian, WANG Peng, MA Xin-xin, LI Wen, XU Ming-xiang. Effects of Grazing Intensity on the Grassland Vegetation Community Characteristics in the Hilly Loess Plateau Region[J]. Acta Agrestia Sinica, 2022, 30(4): 810-817.

孙会, 赵允格, 刘广亮, 高丽倩, 王鹏, 马昕, 李雯, 许明祥. 放牧强度对黄土丘陵区草地植物群落特征的影响[J]. 草地学报, 2022, 30(4): 810-817.

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Effects of Grazing Intensity on the Grassland Vegetation Community Characteristics in the Hilly Loess Plateau Region

放牧强度对黄土丘陵区草地植物群落特征的影响

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