The Soil Animal Research Of Different Agricultural In The Songnen Plains Central

The soil animal is a indispensable element soil formation and development, which can refectthe objective environment characteristics and environmental change stable and objective. Theresearch of soil animal composition, quantity, ecological distribution in heilongjiang province forestecological system is widely, but for farming ecological system the research is weaker. Songnen plainin northeast of China, located in the central part, which is China’s famous "land of the township"and commodity grain base. The research based on Songnen plain east of different terrain and underdifferent cultivated soil animal. Study of the soil animal community composition, structure andcharacter of ecological geography, In order to improve the Songnen plain soil animal fauna list,reveal the relationship between different types of farmland ecosystem soil animal and soil nature,for the Songnen Plain farmland quality evaluation and rehabilitation of degraded soil andmanagement provide decision-making basis, for the Songnen plain soil animal ecology geographyresearch provide the basic data.Field sampling work In the central region of Songnen Plain in9,2011. differentgeomorphology types selected in3sample plots, The obtained a total of16835soil animals, whichbelongs to4phylum: linear animal phylum, Link to animal phylum, software annelid animalsphylum, Arthropod animal phylum;7the outline: nematodes classes, few polychaete, abdomen footclasses, the head of arachnida, the original tail classes, lip foot classes, insects outline,22orderes;76families;202class. Which was3017large soil animal, belong to76class, In most insects., for smalland medium-sized soil animals of126, a total of14016. Different communities, species number andbiomass of three total distribution law is not exactly the same, Show the complexity of biologicalcommunity composition. Large soil animal is more abundancer than in small group number of soilanimal, But the unit area on the middle and small soil animal population is much larger than thenumber of large soil animal. Land use is different, in different soil types, will make the habitat soilanimal composition difference.In the horizontal distribution, three kind of soil animal of the dominant groups, the commongroups, the number of rare species with no obvious correlation between latitude. Vertical distributionof the study area, three overall had surface accumulation. Different kind of soil animal communitynot only in the population and density differences, in dominant species species is also each not same. Different topographic areas of the same way of cultivation, soil animal planting in the sameway, but because of the specific geographical environment different, make the variety of soil animalfauna composition, spatial structure, number of individuals, species number, the dominant group andcommon group are all different.Community feature index analysis shows, four kinds of farmland ecological system on thewhole large soil animal diversity index and evenness index, the richness index is positive correlation,negative correlation and dominance index. Small and medium sized soil animal community diversityindex, evenness index, dominance index, richness index in each research area regularity of different.Three main types of large and small animal soil animal similarity index between0.25-0.5,belong to the middle. Description that soil using in the same way, on soil animal communitysimilarity also have certain effect.In the soil animal and environmental factors correlation. Three research areas are sampling tochange of the pH value in5.79-7.96, most soil animal like in neutral to weakly alkaline soil survival.Study on soil animal in different area and organic matter, total nitrogen, total phosphorus, totalpotassium content correlation with difference. Different kinds of soil moisture content and soilanimal of group and individual numbers have no obvious correlation.