为探讨水分条件对中国沙棘动态生长及生产力的影响,通过田间灌水试验模拟不同水分梯度下的中国沙棘生长情况,以其动态生长量数据为基础材料,基于多形曲线方法并以灌水强度代替此法中的地位指数,构建中国沙棘苗高(新梢)和地径的多形灌水强度年生长模型。结果表明:(1) 不同灌水强度处理间,苗高和地径的Logistics模型3参数皆体现出一定程度差异,参数K和参数b存在极显著差异(Sig.≤0.01),参数a存在显著差异(0.01＜Sig.≤0.05)。(2) 根据生长模型5个生物学意义在灌水处理间的多重比较可知:灌水强度主导的参数差异性使苗高、地径生长模型具备了多形性。(3) 在0~6倍灌水强度内,苗高、地径生长模型参数K符合二次曲线,参数a符合幂函数,参数b符合二次曲线,并据此回归结果构建了中国沙棘苗高和地径的多形灌水强度生长模型。(4) 分析多形灌水强度模型的生产力可知:灌水量为天然降水量的4.83倍时苗高年生长量最大,而地径年生长量最大所需的灌水倍数略低于苗高,为天然降水量的4.53倍。

Yunnan Pine is the p redominant woody tree in southwestern China as well as one of important forest resource in China. The paper give a study to Yunnan p ine forest in mid2Yunnan p rovince and Weibull distributionwereβ distribution were used to fit and forecast the diametral distribution regularity of natural and man-made Yunnan p ine forest. All distributionswere checked by xcheckingmethod. The results showed thatWeibull andβ distribution could describe the diametral distribution well. The curves’measure of skewness is left, and kurtosis value ispositive. The curves have the features of high p recision and good adap tability. Between them, Weibull distribution’s fitting is better thanβ distribution and could be used to forecast the yield, woody quantity and to evaluate management.