哀牢山铗捕小兽群落元素现存量与原子比率

STANDING CROPS OF ELEMENTS AMD ATOMIC RATIOS FOR A SMALL MAMMAL COMMUNITY CAPTURED BY SNAP-TRAPS IN THE AILAO MOUNTAINS

本文分析,计算了中华姬鼠和中华鼩(?)的氮、磷、钾、钠、钙、镁、钡、铝、铁、铜和锌的含量及原子比率。发现除氮外,其它元素含量均有种间差异。此外,估算了10个元素的现存量。

The measurement of standing crops of various elements is first step toward understanding mineral cycling in ecological systems. At the same time, it is very important to investigate the atomic ratios when studying the relationshops between various elements and ultimately, the transfer coefficients between different compartments of certain system. The biomass of Apodemus draco and Neotetracus sinensis account for most of the total trap-captured small mammal biomass, so that it can represent this community. Specimens of A. draco and N.sinensis were collected in a mountainous broad-leaved forest (24.32'N, 101.01'E, 2400m) of Jingdong County, Yunnan in 1987. Each animal was dried under 70C, weighted, ground, and digested by H2S04-HClO4. They were individually analyzed for nitrogen on Semi-trace Kjeldahl Method, and for potassium, sodium, calcium, phosphorum, magnesium, alumium, barium, copper and zinc on the Inductively-Coupled Plasma Emission Sectromery. The biomass on gram dry weight per hectare times the concentrations of the elements presented in this paper equals the standing crop of these elements per hectare. The atomic ratios were calculated by dividing the concentration (ppm) by the atomic weight of every element. The results show that there are significant differences between average concentrations of various elements for A. draco and N. sinensis, except nitrogen. The different cocrete numbers on the element concentrations, the atomic ratios of elements, and the standing crops of elements have been shown in text.