论文部分内容阅读
稻麦生产体系的制约因素来自于两种作物对不同土壤结构状态的要求,提升其系统产出需要有效的手段实现不同土壤结构状态的转化,而对耕后土壤结构状态的准确描述又是其基本问题。尺度划分是描述土壤结构的基础,耕作力学的土壤结构起点尺度为2mm,且以2倍频的尺度分割规则有利于土壤结构的模型表达。实验表明,粘性水稻土耕后的土壤破碎体主要以大于2mm结构体为主,平均土块径在50mm以下,分形维数为2。不过,平均土块径无法提供准确的土壤破碎体尺度分布信息。而模型描述可以直观且准确反映耕作生成的土壤破碎体尺度分布状况。但是,模型描述仍然不利于提供基于土壤破碎体尺度分布信息的土壤功能及作物生长模型,因此对分布模型进一步参数化是提供高阶土壤结构——作物生长模型的基础。结果分析发现,分形维数D能够将耕后土壤结构参量化,从而这一携带尺度分布信息的单一参量有利于建立高阶模型。
The restrictive factors of rice and wheat production system come from the requirements of two kinds of crops for different soil structure states. To improve their system output, effective means are needed to realize the transformation of different soil structure states. fundamental issue. Scale division is the basis for describing the soil structure. The starting scale of soil mechanics is 2mm, and the rule of 2 times frequency division is beneficial to the model expression of soil structure. Experiments show that the sticky paddy soil crushed after the main body of more than 2mm structure-based, with an average block diameter of 50mm below the fractal dimension of 2. However, the average patch diameter does not provide accurate information on the size distribution of the soil crushed. However, the model description can directly and accurately reflect the distribution of soil crushing scale produced by tillage. However, the model description is still not conducive to providing soil functions and crop growth models based on the information of soil crust size distribution. Therefore, further parameterization of the distribution model is the basis for providing a higher-order soil structure-crop growth model. Results show that the fractal dimension D can quantify the soil structure after plowing. Therefore, the single parameter of the distributional information of the carrying scale is conducive to the establishment of high-order models.