Impacts of insect biological control on soil N transformations in Tamarix-invaded ecosystems in the Great Basin,USA |
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| Institution: | 1. School of GeoSciences, Yangtze University, Wuhan, 430100, Hubei, China;2. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing, 210008, China;3. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Beijing), Beijing, 100083, China;4. Laboratory of Evolutionary Entomology and Museum of Amber Inclusions, Department of Invertebrate Zoology and Parasitology, Faculty of Biology, University of Gdańsk, 59, Wita Stwosza Street, PL80-308, Gdańsk, Poland;1. Via del Tamburino 69, I-53040 Piazze, Siena, Italy;2. Hornshøjparken 79, DK-7500 Holstebro, Denmark;3. Bodelschwinghstraße 13, D-34119 Kassel, Germany;1. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Rd., Nanjing 210008, China;2. University of the Chinese Academy of Sciences, Beijing 100049, China;3. College of Palaeontology, Shenyang Normal University, Shenyang 110034, China;4. Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Science, Beijing 100101, China |
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| Abstract: | We investigated impacts of biocontrol of Tamarix spp. by Diorhabda carinulata on soil nitrogen (N) transformations by surveying organic and mineral soils from three sites. Potential net N mineralization was assayed using laboratory incubations. Results partially supported our hypothesis that herbivory would result in stimulated net N mineralization rates after one year of herbivory exposure, and did not support our hypothesis that herbivory would result in a sustained increase in rates after several years of exposure. Short-term effects differed by site, likely influenced by differences in prevailing soil N status, with net mineralization stimulated at a low fertility site but not at a high fertility site. In the longer-term, there was no impact on overall net N mineralization rates, even though there was a trend towards greater N immobilization in mineral soil. This may result from declining organic matter inputs to soil due to progressive growth limitations from herbivore-induced stress. Results suggest soil N availability will increase in the short-term and eventually decrease in the longer-term at low fertility sites, while soil N availability will not be impacted by herbivory at high fertility sites. Widespread management implications will require further research at sites spanning a range of edaphic characteristics. |
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