Mineral‐nitrogen and phosphorus leaching from vegetable gardens in Niamey, Niger
Mineral‐nitrogen and phosphorus leaching from vegetable gardens in Niamey, Niger
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DOI：
10.1002/jpln.200900255
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发表时间：
2011-02
影响因子：
2.5
通讯作者：
Martina Předotová;W. Bischoff;A. Buerkert
中科院分区：
文献类型：
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作者：
Martina Předotová;W. Bischoff;A. Buerkert
城市和城郊农业为满足西非城市快速增长的城市人口日益增长的粮食需求做出了重大贡献。UPA内往往密集的高投入蔬菜生产导致大量的正养分平衡，可能与需要量化的强养分沥滤有关。本研究的目的是估计矿物N和P的淋失在三个代表性的城市花园的尼亚美，尼日尔，使用离子交换树脂盒安装在作物根区以下0.6米的土壤深度。在2007年，年降雨量低于平均水平（425 mm与542 mm相比），两个砂含量>80%的菜园的矿质氮平均淋失量分别为5.9和7.3 kg N ha -1，而一个粉砂和粘土含量为40%的菜园的矿质氮平均淋失量仅为2.2 kg N ha-1。表观年磷淋失量为0.7公斤磷公顷-1在所有三个花园。额外的多年期研究是必要的，以评估在半干旱的西非密集的UPA蔬菜生产的养分淋失的降水年际和年内变化的影响。
Urban and periurban agriculture (UPA) contributes significantly to meeting increasing food demand of rapidly growing urban populations in West African cities. The often intensive high-input vegetable production within UPA results in large positive nutrient balances, being presumably linked to strong nutrient leaching which needs quantification. This study aimed at estimating leaching losses of mineral N and P in three representative urban gardens of Niamey, Niger, using ion-exchange-resin cartridges installed below the crop rooting zone at 0.6 m soil depth. In 2007, a year with below-average annual rainfall (425 mm as compared to 542 mm), mean leaching of mineral N amounted to 5.9 and 7.3 kg N ha -l for two gardens with >80% sand fraction and only 2.2 kg N ha -1 for a garden with 40% silt and clay. Apparent annual P leaching was 0.7 kg P ha- 1 in all three gardens. Additional multiannual studies are necessary to assess the effect of inter- and intraannual variation in precipitation on nutrient leaching in intensive UPA vegetable production of semiarid West Africa.