草炭改土条件下葡萄生长模型模拟研究与灰色关联分析

草炭作为土壤改良剂,可有效调节土壤基质的理化性质.本研究利用草炭在盆栽条件下改良葡萄根际土壤理化性质,用Logistic方程对葡萄年生长节律进行了模拟,并用灰色关联法分析了草炭含量、土壤物理性状及葡萄生长相互关系.结果表明:增施草炭可以显著提高土壤孔隙度、粘粒性物理含量;不同土壤栽培条件下葡萄生长均可用Logistic函数曲线进行可靠描述(R~20.98),并用数学分析的方法确定不同处理梢蔓和梢蔓粗的速生期和速生点,将一年生葡萄生长分为生长前期、速生期和生长后期;土壤施加草炭后,缓苗期缩短,盆栽葡萄较快进入快速生长期,使生长前期缩短4-7d;灰色关联度分析表明,土壤物理性粘粒含量、孔隙度对葡萄新梢生长影响最大,比重对其影响不显著.

Study on Growth Model of the Grape Shoots and Grey Relational Analysis in Soil Amendment with Peat

Peat,a soil amendment,can improve the physical and chemical properties of soil.Logistic model was used to fit grape growth process in the soil improvement.The grey relation degree analysis was used to investigate the relationship of grape growth,peat contents and physical properties.The results showed that total porosity and physical clay contents of the soil-peat mixture was higher than the pure soil.Grape shoot annual growth process under the different growth conditions could be modeled reliably by Logistic function（R~20.98）.Two growth parameters of shoot height and stem were fast growing point and fast growing period.The growth process of one-year grape shoot might be divided into three periods,including the earlier lagstage of growth,the rapid growth stage and the later stage of growth.Grape reviving seedling stage shortened for 4-7d and camed to rapid growth stage in different proportion of peat.Grey relational analysis showed that the effects of the physical clay content and the total porosity on one-year grape shoots were significant,but the soil special gravity＇s were insignificant.