论文部分内容阅读
通过田间试验,建立了实用性膜下滴灌棉花根系吸水模型,研究了在作物生长条件下的土壤水分运动,以揭示膜下滴灌棉花根系吸水规律。调查了不同生育期膜下滴灌棉花根系的分布,在棉花宽行及窄行采用根钻取样,将土样冲洗后,测定棉花根长参数,进而建立了棉花根长密度分布函数。根据理论分析和计算,考虑根长密度、土壤含水率及植株蒸腾量,建立了棉花根系一维吸水模型,其形式简单,涉及的参数较少。建立的棉花根系一维吸水模型能够反映棉花根系吸水的实际情况,应用方便,具有实际应用价值。
Through field experiments, a practical model of drip irrigation cotton under cotton was established, and the soil moisture movement under crop growth was studied to reveal the regularity of cotton root water absorption. The root distribution of cotton under different dril lines was surveyed. Root width was measured on broad and narrow rows of cotton. After soil samples were washed, the parameters of cotton root length were determined. Then the distribution function of cotton root length density was established. According to the theoretical analysis and calculation, taking root length density, soil moisture content and plant transpiration into account, a one-dimensional water absorption model of cotton root is established, which is simple in form and involves less parameters. The establishment of one-dimensional cotton root absorption model can reflect the actual situation of the cotton root system water absorption, easy to use, with practical value.