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| Discussion on the Nutrients Relationship Between the Primary Producers and Decomposers in Forest-ecosystem |
| Liu Zengwen1,Pan Kaiwen2,Li Yasu1 |
| 1.College of Rosources and Environment of Northwest Sci-Tech University of Agriculture and Forestry, 712100, Yangling, Shanxi;2.Chengdu Institute of Biology, Chinese Academy of Science, 610041, Chengdu: China |
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Abstract The nutrients relationship between the primary producers and decomposers in forest-ecosystem is a mutua-competitive and complex relationship. By constructing a flux model of nutrients for a primary producer-decomposer e-cosystem, a determining standard of decomposers increase confined by carbon or nutrients limitation is analysed. Meanwhile , the conditions under which primary producers and decomposers are able to coexist and hence an ecosystem is able to persist are examed, assuming that the system be closed. They include, first, decomposers must be confined by the carbon, that means decomposers are more competitors than primary producers for nutrient uptake. Second, the ratio of mineralization rate to death and excretion rate (a41/a23) must be larger enough than the ratio of carbon /nutrient in primary producers to that in decomposers (α/β) . All these results showed that strict conditions on the carbon/nutrient ratios and competitive abilities of plants and microorganisms must be required to ensure the persistence of ecosystem when stoichiometry is taken into account in ecological process.
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Received: 17 September 2003
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