Soil Fauna Community Ecology and Effects of Nitrogen Addition in Larix Gmelinii and Fraxinus Mandshurica Plantations
|School||Northeast Forestry University|
|Keywords||N fertilizer Soil animals Community structure Feeding habits Diversity Root length density|
Soil animals are the main producers of the soil nutrient release of soil nutrients and carbon (C) the accumulation of a large number of soil animal control through the soil food web, play an important role in the forest ecosystem energy flow and material recycling process. In this study, soil auger method of nitrogen fertilizer (N) fertilizer on soil animal number, group number, feeding habits and diversity of plantation in northern larch (Larix gmelinii) and Manchurian ash (Fraxinus mandshurica); kill by applying insecticide-treated as well as within the growth law of total root length and root length density of soil animals. The following conclusions: (1) the larch plantation soil animal density average 26.1 × 103/m2, belonging to 8 classes, 13 orders and 34 families; Fraxinus mandshurica Plantation 31.6 x 103/m2, belonging to 8 classes, 15 orders and 43 families . Two woodland soil distribution of the number of animals seasons are autumn (October) gt; spring (May) gt; summer (July), the seasonal distribution of the taxa are fall (October) gt; summer (July) gt; spring (May). Soil animal density and group number with the increase of soil depth was significantly lower (P lt; 0.05). The two woodland saprophagous soil animals are dominant (80%), herbivorous soil animals, followed by (10%), the lowest proportion of predatory soil animals (less than 5%). (2) two woodland soil animal density and soil temperature significantly negatively correlated (P lt; 0.05), and soil pH and organic matter content was a significant positive correlation (P lt; 0.01). N fertilizer led to soil animal density and soil temperature, pH value and organic matter content decreased. Only two woodland soil moisture and soil animal density are not related to N fertilization in Manchurian ash-like 10-20cm layer of soil was significantly associated (P lt; 0.05). (3) applied N fertilizer larch woodland soil animal diversity index and evenness index increased to reduce Manchurian ash woodland. N fertilizer larch woodland soil animal dominance index lower increase in Manchurian ash woodland. Seasonal distribution pattern of N fertilizer led to soil animals of the diversity index is a significant change, and the change of the of three index in two woodland inconsistent (P lt; 0.05). (4) in the four sampling periods and different soil applied N fertilizer led to soil fauna and abundance, and the number was reduced after the first increase. N fertilizer lead the larch and Ash saprophagous soil animal numbers significantly reduce the number of animals of herbivorous soil significantly increased the number of predatory soil animals did not change significantly. (5) applied insecticide-treated larch forest soil 0.10 cm layer and 10-20 cm layer of soil animal numbers reduced by 97% and 100%, respectively, Manchurian ash woodland reduced by 94% and 84%, respectively. Reduction in the number of soil animals lead sequence of Larch and Ash woodland total root length and root root length density increased significantly (P lt; 0.05), Description soil animals affect root production, thus affecting the forest ecosystem C cycle.