大针茅草原蛴螬群落主要种群空间分布特征研究

Characteristics of Spatial Distribution for the Main Populations of Scarabaeoideal Larvae in Stipa grandis Steppe

在围封状态下,对内蒙古典型草原主要群落类型大针茅草原蛴螬群落主要种群的空间分布特征进行了研究.结果表明:蛴螬群落的最小积累采样面积约为2m2.草原蛴螬的几个主要种群在其季节性密度高峰期,空间分布方式均表现为不同程度的聚集分布.从种群密度最高时的空间分布看,东方绢金龟、弓斑常丽金龟和黑皱鳃金龟聚集程度较高,马铃薯鳃金龟聚集程度较低.几种优势种间大多表现为正关联,而常见种和稀有种之间大都表现为负关联.

The study on spatial distributing of the main populations of Scarabaeoidea larvae in Stipa grandis steppe of NeiMongol was carried out in May to September 1999 in exclosure of NeiMongol Grassland Ecosystem Research Station of Academic Sinica.The results showed that:(1) The species-area relationship was studied for investing Scarabaeoidea larvae populations.It was showed that the sampling area was at least two squire meters.(2) The spatial distribution characters for main species populations reflected,to a different extent,aggregated distribution in the period of seasonal high density.In point of spatial distrubution in highest density of population,the aggregated degree of Serica orientalis Motschulsky,Trematodes tenebrioides (Pallas) and Cyriopertha arcuata (Gebler) were higher than that of Amphimallon solstitialis (Linnaeus).(3) Interspecific point correlation coefficients among several main populations of Scarabaeoidea larvae reflected positive relations (relation coefficients>1),but that was negative relations between normal species and rare species populations.