降水量的季节分配对羊草草原群落地上部生物量影响的数学模型

根据羊草草原群落地上部生物量连续１３ａ手定位观测资料，分析了降水量及其季节分析对群落地上部生物量年度波动的影响，并应用积分回归模型，计算出１－７月各旬降水量对群落地上部生物量的影响系数。

A Model of Above-ground Biomass of Aneurolepidium chinenseCommunity in Response to Seasonal Precipitation

Based on 13- year observations, the annual response of the above-ground biomass of an Aneurolepidium chinense community to the seasonal changes in precipitation was analysed by establishing an integral regression model between the variable of biomass and the amount of precipitation for every 10 days from January to July. The model indicates that the annual fluctuation in above-ground biomass is highly correlated with the changes in annual precipitation and its seasonal distribution. The biomass responds positively to the amount of precipitation for the periods of January-April and July, indicating they are two critical periods in terms of water requirement of the plant. The effect of the precipitation for January-April is more significant than that for July. In contrast to this, the precipitation for May and June affects the above-ground biomass negatively, since less rainfall in this period would benefit the development of the root system and the accumulation of carbohydrate within the roots as a preparation for fast growth in the following growing phase.