天然梭梭林主要物种基本数量特征及其种间关联研究

The basic quantitative characteristics and inter-species association research of main species in natural Haloxylon ammodendronshrub

为维护荒漠地区的生态环境稳定,探讨巴丹吉林沙漠塔木素地区天然梭梭林中主要优势物种的基本数量特征关系及其种间关联性,以巴丹吉林沙漠东缘塔木素地区的"野生肉苁蓉及梭梭产籽基地"为试验区,划分4个间隔尺度,采用样线法测定2014-2016年间试验区内梭梭、白刺和红砂的高度和冠幅直径,得到的结果如下:一是2014年天然梭梭林中主要优势物种的平均高度和平均冠幅直径均显著高于2015和2016年,这是由塔木素地区2015年频繁出现的扬沙与沙尘暴天气所导致。二是随着间隔尺度的增加,物种的种间关联性不断减弱,且在降水等气候的综合影响下,物种间的协同作用增强,对资源的竞争作用减弱,表现出较强的亲和性。三是较小的间隔尺度主要表现为负联结,即物种间竞争激烈;而较大的间隔尺度以正联结为主,即物种间亲和性较强。

To maintain the stability of the ecological environment in the desert region,and explore basic quantitative characteristics and inter-species association of main dominant species in natural Haloxylon ammodendron shrub of TaMu-Su area,Badain Jaran Desert,this paper regarded＂seed production base of wild cistanche and Haloxylon ammodendron＂in Ta-Mu-Su at the east edge of the Badain Jaran Desert as experimental area,and divided into four interval scales,measured height and crown diameter of Haloxylon ammodendron,Nitraria tangutorumand Reaumuria soongoricain experimental area during 2014-2016 by line transect method.The results are following：firstly average height and average crown diameter of main dominant species in natural Haloxylon ammodendron shrub during 2014 are significantly higher than that of 2015 and 2016,caused by frequent blowing sand and sandstorm in Ta-Mu-Su during 2015.Secondly the inter-species association of species is weakened with the increase of the interval scale,and under the influence of various climatic factors,synergistic effect between species is enhanced and competition for resources is gradually weakened,and species show stronger affinity.Thirdly the smaller interval scale is mainly manifested as negative correlation,that is the competition among species is intense;while the larger interval scale is mainly positive,that is to say the affinity between species is strong.