GJ89 type probe traps was used to monitor the growth and decline trends of insects in bulk wheat,corn,paddy and barley under natural conditions. The period of insects survived in winter,characteristic of insects community composition of one year,growth and decline trends of insects and law of main insect species movements of a day were analysized.
It had been changed the insects community composition in the orchard by using light traps for years running. The pests race had dropped to 97.20% from 99.99%, and the beneficial insect race had gone up to 2.8% from 0.01%, and the insect community was getting balanced.
There were 7 species of earthworm and their community composition differed much among fertilization treatments. Long term single fertilizer applying would reduce species number, total number, and biodiversity index of earthworm in the field.
Base on their community composition and occur- fence dynamics,the pest communities attacking sorghum panicles are divided into two groups:a foxtail millet webworm-dominatede area and a peach borerdominated area.
Community composition, organization laws, above ground phytomass and habitat characteristics of three main meadow communities in the Xilin river flood land of Innermongolia were studied. The community, dominated by Eleocharis intersita, Carex enervis, Agrostis gigantea and mesic forbs, had a high aerial phytomass of 445.64 gDM ?
The differences of plant diversity,community composition,number of different taxonomic groups of microorganism,and water content on and outside the fairy rings of Armillaria luteo-virens were investigated in Ebao village,Qilian county,Qinghai Province,from July,1997 to August,1998.The results showed that the vegetation community on fairy ring was composed differently from that outside of it,but both of them had the same dominant species.
At water pH 5-6, either Rotifera-Copepoda or Cladocera-Copepoda zooplankton complex was established depending on the initial community composition; while at pH 4-5, Copepoda predominated in the established zooplankton community.
The variational model was used to calculate the limiting regions and microbial community composition during stationary growth for different initial combinations of the resources as a function of the limiting resources.
The activities of beavers, even in the absence of construction, promote the increase of abundance and the change of community composition in zooplankton.
There were no significant differences in community composition and structure between the left-and right-hand tributaries of the Hron River.
An effective wetland amphibian monitoring program in the southeastern United States should include multiple sampling methods to obtain the most accurate assessment of species community composition at each site.