【摘要】 本文报道了贝加尔针茅(Stipa baicalensis)草原生产量与主要生态因素积温、降水和土壤有机质含量的关系。讨论了这些生态因素及其交互作用对草原生产量的影响。采用二次正交旋转回归设计和双重组合设计方法建立了贝加尔针茅草原生产量的预测模型,经对该模型的检验表明,所建模型可以在草原畜牧业生产中广泛应用。更多还原

【Abstract】 The paper, a synthesis based on data from our own investigation onStipa baicalensis steppe for the period 1986-1988, deals with the relation-ships amonebiotic biotic and abiotic factors at community ecoloev level. Ana-iysis is appiiea to aboveground net primary proauction （ANPP）, the en-ergy source for livestock production process, with respect to accumulatedtemperature（≥5℃）（X₁）, rainfall in the erowth season of the steppe plants（X₂）, ana content of organic matter of surface soil （X₃）, which are theabotic variables most often used to explain variation in ANPP. The models predicting ANPP in StiPa baicalensis steppe were structuredin term of X₁, X₂, and X₃. The predictive power of the models was foundto be very high, and the models were successfully validated in three caseswith an independent data set. The prediction model that gave the best fit in Stipa baicalensis steppewas Y 528.1328+12.1948X₁+82.5701001X₂+57.1987X₃+12.6375X₁X₂ -6.1265X₁X₃+28.0875X₂X₃-36.1774X₁²-31.4429X₂²-26.2633X₃² We have also made, in detail, the analysis of the relationships am-ong ANPP and 3 ecological factors. ANPP was responsive to all of 3ecological factors discussed in the paper. Action intensity, which has aneffect upon ANPP, can be indicated by a contribution rate. The contrib-ution rates of X₁,X₂, and X₃ were 1.069, 2.0513 and 1.8889, resvectively.更多还原