半干旱生态条件下植物个体的综合生态效应的空间距离分布规律

通过对有关生态因子的空间距离变化规律的测定和引入相应的生态效应系数综合分析,得到在半干旱生态条件下植物个体的综合生态效应的空间距离分布规律为: E=α_1E_(1o)1 (x/hc)~2]-3/2 (α_NE_(NO) α_WE_(WO))1 (x/hr)~2]-3/2 (α_cE_(co) α_hE_(ho))1 (x/hc)~2]-1/2由于具抑制效应的因子的生态效应随相对空间距离增加而减弱的速度大于其互惠效应的因子,在一定相对空间距离处(w/h=6.8)综合生态效应由干扰转变为互惠。定义了生态场的概念。

THE SPATIAL DISTRIBUTION OF THE SYNTHETICAL ECOLOGICAL EFFECT OF PLANT INDIVIDUALS UNDER SEMI-ARID ECOLOGICAL CONDITIONS

The changes in air humidity, CO2 content, light availability, water and nitrogen (N) content in the soil around isolated plants were determined and anahzed in spring wheat, broad bean and apple plant. The coefficient (a) of ecological effect of each factor, which was defined as a rate of biomass increase per day due to the change in an ecological factor, was measured. The law of distribution of synthetical ecological effect in the spactial distance away from the plant studied was obtained as follows.It inhibited strongly to the plant of same ecological niche around the location, The effect was transformed from inhibition into mutual promotion at a relative spatial distance because the inhibition decreased quicker than the promotion.