摘要
地下水是干旱草原区最为关键的生态因子,不仅是生态系统构成、稳定和发展的基础和依据,而且决定着草原群落演替。通过样方采集试验像得到研究区优势种群(大针茅等)覆盖度,同时测量得到不同对应地质单元的水位埋深,建立研究区几种优势种群基于覆盖度的生态分布高斯模型,分析几种优势种群与地下水位关系,找到该优势植被的适宜、不适宜的地下水位埋深,最终得到几种优势种群不同覆盖度下对应的地下水位阈值。结果表明:几种优势种群的地下水位埋深均为10 m以下,其中克氏针茅在3.8 m时植被盖度达到最大值,大针茅在4 m时植被盖度达到最大值,羊草在1.7 m时植被盖度达到最大值。在相应的水位阈值范围内,以上几种优势种群植被盖度与地下水位埋深相关关系明显。
Groundwater is the most important ecological factor in the arid grassland area,which is not only the basis and basis for the composition,stability and development of the ecosystem,but also determines the succession of the grassland community.First,we obtained the coverage of the dominant population of the study area(Stipa grandis)by sampling the sample.At the same time,the depth of the water level of different geological units was measured.Then,the ecological distribution Gauss model based on the coverage of several dominant populations was established.After that,the relationship between the optimal population and the groundwater level was analyzed.Finally,the relationship between the groundwater level and the groundwater level was analyzed.Finally,the corresponding groundwater level thresholds of several dominant populations under different coverage levels was obtained.The results showed that the buried depth of the groundwater level of several dominant populations was below 10 meters,and the vegetation coverage reached the maximum at 3.8 meters,and the vegetation coverage reached the maximum at 4 meters,and the vegetation coverage reached the maximum when Leymus chinensis was 1.7 meters.Within the corresponding threshold of water level,the relationship between vegetation coverage and groundwater depth is obvious.
作者
刘华琳
徐晓民
焦瑞
梁文涛
LIU Hua-lin;XU Xiao-min;JIAO Rui;LIANG Wen-tao(Institute of Water Resources Research for Pastoral Area,The Ministryof Water Resources,Hohhot 010020,China)
出处
《上海农业学报》
2019年第5期83-89,共7页
Acta Agriculturae Shanghai
基金
中国水科院院专项基金(地方级)(MK2016J14)
中央分成水资源费(省部级)(1261430122054)
关键词
优势种群
高斯模型
多度
盖度
地下水位埋深
水位阈值
Dominant group
Gauss model
Abundance
Coverage
Groundwater depth
Water level threshold
