DIFFERENTIAL UTILIZATION OF SUMMER RAINS BY DESERT PLANTS

被引：464

作者：

EHLERINGER, JR

PHILLIPS, SL

SCHUSTER, WSF

SANDQUIST, DR

机构：

[1] Department of Biology, University of Utah, Salt Lake City, 84112, UT

[2] Stable Isotope Ratio Facility for Environmental Research, University of Utah, Salt Lake City, 84112, UT

来源：

OECOLOGIA | 1991年 / 88卷 / 03期

关键词：

HYDROGEN ISOTOPE RATIO; DESERT ECOLOGY; WATER SOURCE; CLIMATE CHANGE; WATER RELATIONS; GROWTH; ROOT; PRODUCTIVITY; COMPETITION; ECOSYSTEMS; VEGETATION; PHENOLOGY; SHRUBS;

D O I：

10.1007/BF00317589

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

Seasonal changes in the hydrogen isotope ratios of xylem waters were measured to determine water sources used for growth in desert plants of southern Utah. While all species used winter-spring recharge precipitation for spring growth, utilization of summer rains was life-form dependent. Annuals and succulent perennials exhibited a complete dependence on summer precipitation. Herbaceous and woody perennial species simultaneously utilized both summer precipitation and remaining winter-spring precipitation, with herbaceous species much more reliant on the summer precipitation component. Several of the woody perennials exhibited no response to summer precipitation. Currently, precipitation in southern Utah is evenly partitioned between winter and summer time periods; however, global circulation models predict that summer precipitation will increase in response to anticipated climate change. Our data indicate that components within the community will differentially respond to the change in precipitation patterns. These results are discussed in relation to impact on competition and possible changes in community structure.

引用

页码：430 / 434

页数：5

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