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759986494金虫 (著名写手)
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Differential response to tree fallows in rotational woodlot systems in semi-arid Tanzania: Post-fallow maize yield, nutrient uptake, and soil nutrients |
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terry_well
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笑熬浆糊——满脑浆糊
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【答案】应助回帖
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Agroforestry tree species producing high quality litter may enhance post-fallow soil nutrient availability and crop yields through mineralization of soil organic matter and green manure. A split-plot field experiment was used to evaluate maize yield and soil N and P status after fallowing indigenous and exotic tree species of contrasting litter quality. Responses were compared with recommended inorganic fertilizer use. The objective was to assess efficacy of 5-year tree fallows in improving soil productivity to screen species for increased crop yield under rotational woodlot culture, an agroforestry system mainly used for on-farm fuelwood production in semi-arid Tanzania. Post-fallow maize yield and soil nutrients differed significantly among tree fallows. Low C:N and L:N ratios enhanced nutrient release from slash. Acacia polyacantha (indigenous) and Gliricidia sepium fallows doubled maize yield compared to the natural fallow probably due to high soil N and P levels resulting from net release by high quality foliage. First season maize yield was similar to that from combined N and P fertilizers indicating high capacity of the fallows to improve crop yields and reduce fertilizer inputs usually unaffordable to small-scale farmers. Comparatively low maize yield and soil N and P levels after exotic Acacia crassicarpa and Acacia mangium fallows were attributed to net N immobilization by poor quality litter during growing seasons. This study suggests that rotational woodlot systems utilizing tree species with high litter quality can improve both post-fallow maize yield and soil fertility as well as produce sufficient fuelwood. In this aspect, A. polyacantha would be the most appropriate species. (C) 2007 Elsevier B.V. All rights reserved. 应该是这个摘要.从摘要初步可以看出,作者想表达的是农林体系可以改善土壤结构,增加土壤各种营养元素含量,进而提高作物的产量,该文章主要讲的是如何利用能产生高质量营养废渣的树木对土壤进行改善,同时可以提供大量的木材燃料,polyacantha应该是最好的可以达到此种目的树种之一. |
5楼2011-11-29 23:28:24
terry_well
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2楼2011-11-29 21:54:14
759986494
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3楼2011-11-29 22:39:43
terry_well
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笑熬浆糊——满脑浆糊
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4楼2011-11-29 23:21:47