Abstract
The application of organic residues and the release dynamics of nutrients during decomposition may be crucial to improving poplar growth in upland areas. Field experiments were conducted in Guizhou Province, southwestern China, to determine differences in biomass decomposition of four potential mulching materials in one-year-old poplar plantations. Results showed the initial total content of N, P, K, Ca and Mg in the mulches ranged from 30.0 to 35.0 g/kg and was significantly greater in Quercus fabri, Imperata cylindrica var. major and Pteridium aquilinum var. latiuscukum than in Coriaria nepalensis. The weight loss pattern of these four species during decomposition could be best described by a double exponential decay model, and monthly decay rate coefficients (k) were in the order Q. fabri > C. nepalensis > I. cylindrica > P. aquilinum over a one-year period. Total nutrient (N, P and K) release of the four mulching materials ranged from 74.2 to 90.8% of the initial content after one year of decomposition, while nutrients were released in the order K > P>N. Nutrient release was fastest in C. nepalensis followed by Q. fabri, I. cylindrica, and slowest in P. aquilinum. Thus, taking into account initial nutrient content, nutrient additions and decay rates, the sprouts of woody species (Q. fabri and C. nepalensis) with massive foliage proved to be more important as nitrogen sources than the grass or fern.
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Acknowledgements
The authors would like to thank Dr. Yingqiang Ding, Faculty of Forestry, University of British Columbia for his fruitful comments and English correction, and Prof. Huanchao Zhang from Nanjing Forestry University for his kind assistance. This study was fully funded by the National Natural Science Foundation of China (project number: 30671671), and also supported by National Key Project of Scientific and Technical Supporting Programs funded by Ministry of Science & Technology of China during the 11th 5-year Plan (no. 2006BAD24B0402).
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Fang, S., Li, H. & Xie, B. Decomposition and nutrient release of four potential mulching materials for poplar plantations on upland sites. Agroforest Syst 74, 27–35 (2008). https://doi.org/10.1007/s10457-008-9155-0
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DOI: https://doi.org/10.1007/s10457-008-9155-0