期刊
BIOMASS & BIOENERGY
卷 21, 期 5, 页码 321-334出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0961-9534(01)00045-9
关键词
biomass production; coppice systems; nutrient cycling; nutrient regime; retranslocation; willows
In order to obtain a more compete understanding of the macronutrient dynamics in coppiced willow plantations, a pot experiment with Salix dasyclados was performed. In this study, the seasonal variation in concentration and amounts of N, P, K, Mg, Ca and S in roots, cutting, stem and leaves were determined. Plants were grown in pots containing I I of washed sand under outdoor conditions. Nutrients were given during the first 3-4 weeks at two relative addition rates, 0.08 (-Nutr) and 0.12 (+Nutr) day(-1), respectively. Nine harvests were performed and covered a whole seasonal cycle. At each harvest, leaf area (growing season only), dry weight and macronutrient concentrations in roots, cutting, stem and leaves (growing season only) were determined. Plants in the +Nutr treatment continued to grow 2 weeks longer in the autumn than -Nutr plants and started to grow I week earlier the following spring, The leaf area and the weight of the different plant parts were significantly higher in the +Nutr plants. Between 40% and 50% of N and about 60% of P was withdrawn from the leaves prior to abscission and stored mainly in the above-ground perennial organs. Retranslocation of K and S from senescing leaves was only observed in -Nutr plants. No seasonal trends and no retranslocation from senescing leaves were observed for Ca and Mg. At bud break, N stored in all perennial organs was used for growth of new shoots. (C) 2001 Elsevier Science Ltd. All rights reserved.
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