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Biomass production and nutrient content of three agroforestry tree species growing on an acid Anthropic Ferralsol under recurrent harvesting at different cutting heights
Agroforestry Systems ( IF 2.2 ) Pub Date : 2020-01-29 , DOI: 10.1007/s10457-019-00455-8
Marguerite Mukangango , Jean Nduwamungu , Francois Xavier Naramabuye , Gert Nyberg , A. Sigrun Dahlin

Agroforestry systems may alleviate challenges relating to soil degradation and low livestock production for smallholder farmers. Species-adjusted management regimes will determine how agroforestry fits in farming systems. Long-term productivity of biomass in agroforestry systems managed for fodder production requires tree species that coppice after repeated cutting. This study evaluated the effect of different cutting heights (0.3 and 1.0 m) and repeated harvests (1–5) on biomass production and chemical composition of the leguminous trees Acacia angustissima , Leucaena pallida and Mimosa scabrella in a field study on an Anthropic Ferralsol in Southern Rwanda. Shoot biomass production was highest at 0.3 m cutting height for A. angustissima and L . pallida , but M. scabrella could not survive that cutting height. Shoot biomass was highest for A. angustissima and lowest for M. scabrella , which did not adapt to repeated harvests. Leaf:stem ratio was not affected by cutting height. Cutting height did not affect crude protein (CP), but neutral detergent fibre (NDF), acid detergent fibre (ADF) and total polyphenol (TP) concentrations were higher at 1.0 m cutting height than at 0.3 m. Crude protein was highest in A. angustissima and lowest in M. scabrella , while NDF and ADF were highest in M. scabrella. Although all species provided high feed quality in terms of high CP content at both cutting heights, low cutting height (0.3 m) is recommended for A. angustissima and L. pallida for higher overall quality and biomass production.

中文翻译:

生长在酸性人类铁溶胶上的三种农林树种在不同伐高度反复采伐下的生物质产量和养分含量

农林业系统可以缓解与小农户的土壤退化和畜牧产量低相关的挑战。物种调整管理制度将决定农林业如何适应农业系统。为饲料生产而管理的农林业系统中生物质的长期生产力需要树种在反复砍伐后进行矮化。本研究评估了不同切割高度(0.3 和 1.0 m)和重复收获(1-5)对豆科植物 Acacia angustissima、Leucaena pallida 和 Mimosa scabrella 的生物量生产和化学成分的影响卢旺达南部。A. angustissima 和 L 的枝条生物量产量在 0.3 m 切割高度最高。pallida ,但 M. scabrella 无法在那个切割高度存活下来。A 的枝条生物量最高。angustissima 和 M. scabrella 最低,不适应重复收获。叶茎比不受切割高度的影响。切割高度不影响粗蛋白 (CP),但中性洗涤纤维 (NDF)、酸性洗涤纤维 (ADF) 和总多酚 (TP) 浓度在 1.0 m 切割高度高于 0.3 m。粗蛋白在 A. angustissima 中最高,在 M. scabrella 中最低,而 NDF 和 ADF 在 M. scabrella 中最高。虽然所有物种在两个切割高度都提供高 CP 含量方面的高饲料质量,但建议为 A. angustissima 和 L. pallida 使用低切割高度 (0.3 m),以获得更高的整体质量和生物量产量。切割高度不影响粗蛋白 (CP),但中性洗涤纤维 (NDF)、酸性洗涤纤维 (ADF) 和总多酚 (TP) 浓度在 1.0 m 切割高度高于 0.3 m。粗蛋白在 A. angustissima 中最高,在 M. scabrella 中最低,而 NDF 和 ADF 在 M. scabrella 中最高。虽然所有物种在两个切割高度都提供高 CP 含量方面的高饲料质量,但建议为 A. angustissima 和 L. pallida 使用低切割高度 (0.3 m),以获得更高的整体质量和生物量产量。切割高度不影响粗蛋白 (CP),但中性洗涤纤维 (NDF)、酸性洗涤纤维 (ADF) 和总多酚 (TP) 浓度在 1.0 m 切割高度高于 0.3 m。粗蛋白在 A. angustissima 中最高,在 M. scabrella 中最低,而 NDF 和 ADF 在 M. scabrella 中最高。虽然所有物种在两个切割高度都提供高 CP 含量方面的高饲料质量,但建议为 A. angustissima 和 L. pallida 使用低切割高度 (0.3 m),以获得更高的整体质量和生物量产量。
更新日期:2020-01-29
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