Effects of soil compaction on the relationships between nematodes,grass production and soil physical properties |
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| Institution: | 1. Alterra, Green World Research, P.O. Box 47, 6700 AA Wageningen, The Netherlands;2. DLO Research Institute for Agricultural and Environmental Engineering, P.O. Box 43, 6700 AA Wageningen, The Netherlands;1. School of Life Science, Lanzhou University, Lanzhou, 730000, China;2. College of Agriculture and Life Sciences, Dali University, Dali, Yunnan, 671000, China;3. Department of Biomedical Sciences, University of Wisconsin, Milwaukee, WI, 53211, USA;1. Haikou Experimental Station, Chinese Academy of Tropical Agricultural Sciences, Haikou 570102, China;2. Hainan Key Laboratory of Banana Genetic Improvement, Hainan, Haikou 570102, China;3. Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Science, Haikou 570101, China;1. National Engineering Laboratory for Improving Quality of Arable Land, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China;2. Key Laboratory of Agro-Ecological Processes in Subtropical Regions, Changsha Research Station for Agricultural & Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan, 410125, PR China;1. University of Bern, Bern, Switzerland;2. Institute of Hydraulic Engineering and Water Resources Management, Vienna University of Technology, Vienna, Austria;3. Department of Soil Science, University of Kassel, Kassel, Germany |
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| Abstract: | As farm machinery has become heavier, concern has grown about its direct effects on soil physical conditions and its indirect effects on crop yields and soil biota. To study the relationships between these parameters, non-grazed temporary grassland plots on a loamy sand soil were subjected to full-width load traffic with widely different loads (0, 4.5, 8.5 and 14.5 t) one to four times per year for a period of 5 years. Soil bulk density was monitored as an indicator of soil compaction. Grass yield was measured throughout the experimental period. Root distribution over the soil profile and nematodes populations were assessed during the final year of the experiment. Results indicate that a moderate degree of compaction (～4.5 t load) gave the highest crop yield and that at higher degrees of compaction roots failed to penetrate into the deeper soil layers (>20 cm depth). Total numbers of nematodes were not affected by compaction, but their distribution over the various feeding types shifted towards a population with increased numbers of herbivores and decreased numbers of bacterivores and omnivores/predators. This change in the structure of the nematode assemblage is associated with poorer conditions for crop growth. |
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