Nitrogen concentration in the urine of cattle, sheep and deer grazing a common ryegrass/cocksfoot/white clover pasture
Nitrogen concentration in the urine of cattle, sheep and deer grazing a common ryegrass/cocksfoot/white clover pasture
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DOI：
10.1080/00288233.2010.499899
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发表时间：
2010-01-01
影响因子：
1.8
通讯作者：
Ledgard, S. F.
中科院分区：
文献类型：
--
作者：
Hoogendoorn, C. J.;Betteridge, K.;Ledgard, S. F.
春季在早、中、晚连续三天分别测定两次尿液中的总氮（N）浓度，秋季采样一次。羊、牛和鹿单次排尿的尿氮浓度平均值（和范围）分别为 7.9（1.4-17.8）、4.4（0.9-13.2）和 4.1（0.5-16.6）g N kg-1 新鲜尿液。在几天之内、几天之间以及同一物种内的动物之间，尿液氮浓度存在很大的差异。三种不同物种的尿液氮浓度在任一测量场合均存在显着差异，但不同测量场合之间的差异不一致。本研究中提出的结果可能对基于过程的模型的开发具有影响，该模型能够解释放牧系统中排泄氮的空间异质返回。
Total nitrogen (N) concentration in the urine of 12- to 18-month old female sheep, cattle and deer grazing a common pasture was measured in the morning, noon and evening for three consecutive days on two separate occasions in spring, and on a single occasion sampling in autumn. Mean (and range) of urine N concentrations for single urinations were 7.9 (1.4-17.8), 4.4 (0.9-13.2) and 4.1 (0.5-16.6) g N kg-1 fresh urine for sheep, cattle and deer, respectively. Wide ranges in urine N concentration were found within days, between days and between animals within the same species. Differences in urine N concentration between the three different species in any one measurement occasion were significant but inconsistent between measurement occasions. The results presented in this study may have implications for the development of process-based models capable of accounting for the spatially heterogeneous return of excretal N in grazed systems.