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首页> 外文期刊>Journal of Turfgrass Management >Estimating Non-Gaseous Nitrogen Losses from Established Turf
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Estimating Non-Gaseous Nitrogen Losses from Established Turf

机译：估算既有草皮的非气态氮损失

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摘要

Preserving the quality of ground water resources has become a serious concern for those responsible for intensively managed turf operations in suburban and rural areas of the humid eastern U.S.A. Nitrate leaching from Kentucky bluegrass (Poa pratensisL. cv. Baron) and Che wings fescue (Festuca rubra ssp. commutata Gaud. cv. Jamestown) turf managed at different fertility levels was estimated and compared with nitrogen (N) loss through clipping removal. Urea was applied at 72, 144 and 288 kg N ha~(-1)yr~(-1) in increments throughout the growing season or as a single treatment in mid-May. Turf intensively managed for eight years was compared with minimally fertilized turf 18 months old. Clippings were collected, analyzed for N and found to contain amounts equivalent to 51 to 102% of the N applied. Percent N recovery in clippings was inversely related to application rate. Nitrate (NO_3) leaching during the growing season was estimated from a hydrologic mass balance model and the nitrate content of soil water collected in suction lysimeters installed 60 cm in the soil. Leaching accounted for <1 to 8% of applied N. Vigorous healthy turf is a strong sink for N but its capacity may decrease after prolonged periods of intensive fertility management.
机译：对于负责在美国东部潮湿地区的郊区和农村进行集约化管理的草坪经营者而言，保护地下水资源的质量已成为一个严重的问题。估算了在不同肥力水平下管理的草皮草（Ssp。commutata Gaud。cv。Jamestown）的草皮，并将其与通过修剪去除的氮（N）损失进行了比较。在整个生长季节或以五月中旬的单一处理方式，分别以72、144和288 kg N ha〜（-1）yr〜（-1）的剂量施用尿素。将密集管理8年的草皮与18个月大的最低受精草皮进行比较。收集剪枝，分析N，发现其含量等于所施氮量的51％至102％。剪报中氮的回收率与施药量成反比。根据水文质量平衡模型估算生长季节中的硝酸盐（NO_3）淋洗，并通过安装在土壤中60厘米处的抽气式测渗仪收集的土壤水中的硝酸盐含量。淋溶占施氮量的1％至8％。有力的健康草皮是N的强大吸收剂，但长期强化耕种管理后其能力可能下降。

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