Influence of nitrogen loading and species composition on the carbon balance of grasslands

被引：435

作者：

Wedin, DA ^{[1
]}

Tilman, D ^{[1
]}

机构：

[1] UNIV MINNESOTA, ST PAUL, MN 55108 USA

来源：

SCIENCE | 1996年 / 274卷 / 5293期

关键词：

D O I：

10.1126/science.274.5293.1720

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

In a 12-year experimental study oi nitrogen (N) deposition on Minnesota grasslands, plots dominated by native warm-season grasses shifted to low-diversity mixtures dominated by cool-season grasses at all but the lowest N addition rates. This shift was associated with decreased biomass carbon (C):N ratios, increased N mineralization, increased soil nitrate, high N losses, and low C storage, In addition, plots originally dominated by nonnative cool-season grasses retained little added N and stored little C, even allow N input rates. Thus, grasslands with high N retention and C storage rates were the most vulnerable to species losses and major shifts in C and N cycling.

引用

页码：1720 / 1723

页数：4

共 39 条

[1] PLANT AND SOIL RESPONSES TO CHRONIC NITROGEN ADDITIONS AT THE HARVARD FOREST, MASSACHUSETTS [J].