WOODLAND GRASSLAND BOUNDARY CHANGES IN THE MIDDLE NIOBRARA VALLEY OF NEBRASKA IDENTIFIED BY DELTA-C-13 VALUES OF SOIL ORGANIC-MATTER

被引：17
|
作者：
STEUTER, AA [1 ]
JASCH, B [1 ]
IHNEN, J [1 ]
TIESZEN, LL [1 ]
机构：
[1] AUGUSTANA COLL,DEPT BIOL,SIOUX FALLS,SD 57197
来源：
AMERICAN MIDLAND NATURALIST | 1990年 / 124卷 / 02期
关键词：
D O I：
10.2307/2426179
中图分类号：
X176 [生物多样性保护];
学科分类号：
090705 ;
摘要：
Carbon isotope ratios for soil and root samples obtained beneath the canopies of known-age ponderosa pine Pinus ponderosa are used to provide evidence of the time associated with community change. Woodlands were formerly more narrowly restricted to the lower slopes of the Niobrara canyon and its short tributary streams. Isolated patches of woodland vegetation existed within a grassland matrix on the upper canyon slopes prior to European settlement. These patches now occur within the expanded woodland matrix. -from Authors
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页码：301 / 308
页数：8
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