摘要
以内蒙古草甸草原、典型草原、荒漠草原为研究对象,设置轻度、中度、重度以及对照样地4个放牧梯度,经过5年连续野外实验,研究在不同草地类型中放牧对羊草地上生物量的影响。研究结果表明:随放牧强度的增加羊草地上生物量显著下降;在草甸草原中羊草地上生物量在重度放牧强度下最低,对照样地和重度放牧样地的羊草地上生物量与降水呈正相关关系;在典型草原中羊草地上生物量在对照样地中最高,中度放牧的羊草地上生物量与降水的负相关性达到显著水平;在荒漠草原中,放牧和年度的交互作用达到显著水平,羊草地上生物量在2005年表现出显著差异,轻度放牧显著高于其他放牧强度,羊草地上生物量在轻度放牧样地中与降水呈极显著负相关关系。
In order to determine the response of dominant species to different grazing intensities（light,moderate,heavy,and control）,the above-ground biomass of Leymus chinensis was examined in meadow steppe,typical steppe and desert steppe,respectively.This study was conducted for 5consecutive years to reveal the response of Leymus chinensis above-ground biomass to grazing.The results indicated that：The above ground biomass of L.chinensis was inversely related to grazing intensity.The biomass was the lowest in heavy grazing in meadow steppe,L.chinensis above-ground biomass increased with precipitation raising in the no-grazing and heavy grazing,and the correlation reached extremely remarkable level in heavy grazing.In typical steppe,the above-ground biomass of L.chinensis was significantly negative associated with precipitation in the moderate grazing.The interaction between grazing and year were significantly different in desert steppe,the above-ground biomass of L.chinensisin light grazing was higher than other treatments in 2005 year,and its biomass was significantly negative associated with precipitation in the light grazing.Therefore,the decrease of above-ground biomass of L.chinensis on different grazing intensity and steppe was different.
出处
《中国草地学报》
CSCD
北大核心
2016年第4期76-82,共7页
Chinese Journal of Grassland
基金
国家自然科学基金项目(31270502)
内蒙古科技攻关项目(204202199)
研究生科研创新项目(B20151012906Z)
关键词
放牧强度
羊草
草地类型
降水
Grazing intensity
Leymus chinensis
Grasslands
Precipitation
