摘要
本文以呼伦贝尔草甸草原为对象,研究了不同放牧强度对草原群落土壤水热状况和地上生物量的影响,旨在揭示二者之间的相互关系。研究结果表明,随着放牧强度的增加,生长季平均土壤温度呈逐渐上升的趋势;放牧对群落3个组份[羊草(Leymus chinensis)、贝加尔针茅(Stipa baicalensis)、杂类草]生物量和相对优势度产生影响。其中,羊草地上生物量和优势度随着放牧强度的增加显著线性降低,而贝加尔针茅和杂类草的生物量与优势度均在中度放牧处理下最高。土壤含水量与羊草生物量显著正相关,与杂类草生物量负相关,而与贝加尔针茅生物量间的关系极弱。本研究为完善放牧优化理论,揭示放牧在草地生态系统功能过程中的梯度效应提供了一个较为重要的研究线索,为草地放牧优化管理制度的确立提供了一定的科学依据。
This study experimentally evaluated the effects of cattle grazing on the soil water-heat regime and the above-ground biomass in a meadow steppe community of the Hulun Buir grassland region.We found that the mean soil temperature of the growth season showed an increasing trend with increasing grazing intensity.Grazing imposed different impacts on the biomass and relative dominance values of the three components(Leymus chinensis,Stipa baicalensis and forbs).Specifically,with increasing grazing intensity,the biomass and the relative dominance of Leymus chinensis declined linearly whereas the maximal biomass and dominance values occurred at the intermediate grazing intensity for the other two components.The soil water content had significant positive correlation with the biomass of L.chinensis and forbs,and had weak correlation with the biomass of S.baicalensis.Our findings may provide a new insight in furthering developing the grazing optimization theory and unraveling the intermediate-grazing intensity effects in a broader sense.
作者
李彤
张宇
赵晋灵
闫瑞瑞
辛晓平
王旭
陈金强
吴冬秀
李凌浩
赵曼
LI Tong;ZHANG Yu;ZHAO Jin-ling;YAN Rui-rui;XIN Xiao-ping;WANG Xu;CHEN Jin-qiang;WU Dong-xiu;LI Ling-hao;ZHAO Man(Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China;University of Chinese Academy of Sciences, Beijing 100049, China;Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China;Northeast Normal University, Changchun, Jinlin Province 130024, China;Hulunbeier Nongken Sheertala Farm and Ranch Co.,Ltd.,Hulunbeier, Inner Mongolia 021012, China)
出处
《草地学报》
CAS
CSCD
北大核心
2021年第11期2577-2582,共6页
Acta Agrestia Sinica
基金
国家重点研发计划(2017YFE0104500,2016YFC0500601)
国家自然基金面上项目(31971769)
中央级公益性科研院所基本科研业务费专项(Y2019YJ13,Y2020YJ19,1610132021016)
呼伦贝尔市科技计划项目(YYYFHZ201903)
农业科技创新联盟建设-农业基础性长期性科技工作(NAES037SQ18)
现代农业产业技术体系建设专项资金(CARS-34-11)资助。
关键词
放牧强度
土壤含水量
土壤温度
优势度
群落动态
Grazing intensity
Soil water content
Soil temperature
Dominance value
Community dynamics
