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Sampling-Induced Increases in Net Nitrification in the Brush Brook (Vermont) Watershed

Department of Plant and Soil Science, University of Vermont Burlington, VT 05405

View larger version (19K): [in a new window]   Fig. 1. Inorganic N in weekly leachates from a laboratory study of highly disturbed soils (Exp. 1). Soil columns contained a homogenized mixture of Oi and Oe horizon material.

View larger version (22K): [in a new window]   Fig. 2. Repeated measurements of inorganic N in a bulked Oa sample (Exp. 3a), beginning shortly after sampling. Separate subsamples were extracted over time by two different methods.

View larger version (18K): [in a new window]   Fig. 3. Repeated measurements of inorganic N in a bulked Oa sample (Exp. 3b). Separate subsamples were extracted over time with 2 M KCl.

View larger version (22K): [in a new window]   Fig. 4. Repeated measurements of inorganic N in a bulked Oa sample (Exp. 3c). Separate subsamples were extracted over time with 2 M KCl. An additional set of subsamples was incubated in a 1% acetylene atmosphere before extraction.

View larger version (33K): [in a new window]   Fig. 5. Nitrate in the Oa horizon from two sizes of cores (Exp. 4). The disturbed treatment consisted of bulked Oa samples from cores dismantled just after sampling. Error bars represent the standard error of each treatment across blocks. The difference between 3 d disturbed and intact cores was significant (P < 0.05).

View larger version (37K): [in a new window]   Fig. 6. Nitrate in the Oa horizon of intact cores incubated with and without added NH+4 (Exp. 5a–c). Each graph represents a different replication of the experiment (see Table 1). Error bars represent the standard error of each treatment across blocks. With the three experiments combined, there was a significant (P < 0.05) increase in nitrate in the intact cores in response to added NH+4.