SPECIES COMPOSITION AND STANDING CROP VARIATION IN AN UNFERTILIZED MEADOW AND ITS RELATIONSHIP TO CLIMATIC VARIABILITY DURING 6 YEARS

被引：23

作者：

STAMPFLI, A

机构：

[1] Systematisch-Geobotanisches Institut der Universität Bern, Bern, CH-3013

来源：

FOLIA GEOBOTANICA & PHYTOTAXONOMICA | 1995年 / 30卷 / 02期

关键词：

EVAPORATION; FLUCTUATION; PLANT POPULATIONS; TIME-LAGS OF RESPONSE; RELATIVE MOISTURE; WEATHER;

D O I：

10.1007/BF02812092

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Year-to-year variability of species composition and hay yield were investigated during a six-year period (1988-1993) in a traditionally mown meadow of great species richness at Negrentino in southern Switzerland. Climatic parameters (temperature, duration of sunshine, global radiation, precipitation, evaporation, relative moisture) measured at a nearby weather station were calculated for ten-day units and compared to quantitative vegetation data. Yields of the first and second harvest were positively correlated with the mean relative moisture during the first and second growth period. Distinct variation patterns were recognized among the 48 species and interpreted as direct or indirect responses of interacting species to climatic conditions during three periods of the year. The first variation pattern including abundant graminoids reflects a strong direct effect by weather conditions in the first growth period. Species of the other variation patterns responded differently to extreme summer droughts with apparent time-lags. Some species reflect warm and humid conditions in early spring followed by; dry conditions in a particular year; others combine features of different variation patterns.

引用

页码：117 / 130

页数：14

共 29 条

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