NITROGEN MINERALIZATION POTENTIALS OF SHRUB-STEPPE SOILS WITH DIFFERENT DISTURBANCE HISTORIES

被引:76
|
作者
BOLTON, H [1 ]
SMITH, JL [1 ]
WILDUNG, RE [1 ]
机构
[1] USDA ARS, PULLMAN, WA 99164 USA
关键词
D O I
10.2136/sssaj1990.03615995005400030046x
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
The soil N-mineralization potential (No) was determined for two arid ecosystems, an undisturbed perennial shrub-steppe and an annual grassland. The No decreased with soil depth until the 10- to 15-cm soil depth, when all soils had the same value. The production of plant-available N will, therefore, be largely limited to the soil surface, and losses from the first 5 cm of soil will be detrimental to both ecosystems. Spatial distribution of plant species in the arid ecosystem result in "islands' where enhanced N mineralization occurs. -from Authors
引用
收藏
页码:887 / 891
页数:5
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