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Nitrogen Transfer to Forage Crops from a Caragana Shelterbelt

机译:柠条将氮从柠条转移到饲草上

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Caragana shelterbelts are a common feature of farms in the Northern Great Plains of North America. We investigated if nitrogen (N) from this leguminous shrub contributed to the N nutrition of triticale and oat forage crops growing adjacent to the shelterbelt row. Nitrogen transfer was measured using 15N isotope dilution at distances of 2 m, 4 m, 6 m, 15 m and 20 m from the shelterbelt. At 2 m caragana negatively impacted the growth of triticale and oat. At 4 m from the shelterbelt productivity was maximum for both forage crops and corresponded to the highest amount of N originating from caragana. The amount of N transferred from caragana decreased linearly with distance away from the shelterbelt, but even at 20 m from the shelterbelt row measureable amounts of N originating from caragana were detectable in the forage biomass. At 4 m from the shelterbelt approximately 40% of the N in both oat and triticale was from caragana, and at 20 m from the shelterbelt approximately 20% of the N in oat and 8% of the N in triticale was from caragana.
机译:柠条防护林带是北美北部大平原农场的共同特征。我们调查了这种豆科灌木中的氮(N)是否有助于黑小麦和燕麦防护草行附近生长的小麦和草料作物的氮营养。使用 15 N同位素稀释法在距防护林2 m,4 m,6 m,15 m和20 m的距离处测量氮的转移。在2 m时,锦鸡儿对小黑麦和燕麦的生长产生了负面影响。在距离防护林带4 m处,两种饲料作物的生产力最高,并且对应于源自柠条锦鸡的最高N量。从柠条中转移的N量随与防护林带的距离呈线性下降,但即使在距防护林行20 m处,在牧草生物量中也可检测到源自柠条的N。距防护带4 m处,燕麦和黑小麦中大约40%的N来自柠条,而距防护带20 m处,燕麦中N的大约20%和黑小麦中N的8%来自柠条。

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