Evaluation of an in situ net soil nitrogen mineralization method in dryland agroecosystems

被引:67
作者
Kolberg, RL [1 ]
Rouppet, B [1 ]
Westfall, DG [1 ]
Peterson, GA [1 ]
机构
[1] COLORADO STATE UNIV,DEPT CROP & SOIL SCI,FT COLLINS,CO 80523
关键词
D O I
10.2136/sssaj1997.03615995006100020019x
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
Direct quantitative measurement of soil net N mineralization in agricultural soils under field conditions has not been widely used. A potential method of in situ net N mineralization was investigated in the fallow phase of a 3-yr no-till crop rotation at two sites. Undisturbed soil cores (5 by 15 cm) with anion- and cation-exchange resins (Sybron Ionac ASB-1P and C-249) at the bottom were incubated in situ. Nitrate-N plus NH4+-N extracted from soil was added to extracted amounts from resin bags to determine net N mineralized during each of three incubation periods (3-4 wk each). Total net N mineralization was 33.7 and 26.5 kg N ha(-1) during 84 and 75 d of incubation at Sterling and Stratton, respectively. Relative amounts of resin did not affect N captured but cores placed midway between old corn (Zea Mays L.) rows tended to accumulate more (P > F = 0.13) N than cores placed in rows. This in situ method appears to be a reliable method for measuring net N mineralization in the field; however, variation is large and many observations are required to obtain net N mineralization rates within an acceptable confidence interval.
引用
收藏
页码:504 / 508
页数:5
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