ABSTRACT

The aim of this study is to determine the optimal soil bulk density in newly added cultivated land for maintaining soil moisture and crops growing. In this work, a field experiment was conducted to study the effect of 5 different soil’s bulk density (BD) on soil moisture and crop yield in newly created land on gravel: T23 (BD = 1.3 g/cm³), T24 (BD = 1.4 g/cm³), T25 (BD = 1.5 g/cm³), T26 (BD = 1.6 g/cm³), T27 (BD = 1.7 g/cm³). The root zone water quality model (RZWQM) was calibrated and verified with experimental data, and then applied to simulate the soil moisture and crop yield under different bulk density from 2004 to 2016. Simulation prediction shows that the average yield of the soil bulk density of T25 treatment is highest with 7551 kg/ha, and the CV of multi-year crop yield is the minimum with 31.9%, meaning that the yield of crops of this bulk density is the most stable. The relationship between soil water storage and growth period yield is approximately linear, with R² of 0.46. Comprehensive analysis indicates that the soil bulk density of that 0–40 cm – soil bulk density = 1.2 g/cm³; 40–50 cm soil bulk density = 1.5 g/cm³ is more conducive to water conservation and crop growth.

摘要

这项研究的目的是确定新增加的耕地中的最佳土壤容重，以保持土壤水分和作物生长。在这项工作中，进行了一项野外实验，研究了5种不同的土壤容重（BD）对砾石新创建土地中土壤水分和作物产量的影响：T23（BD = 1.3 g / cm ³），T24（BD = 1.4 g / cm ³），T25（BD = 1.5 g / cm ³），T26（BD = 1.6 g / cm ³），T27（BD = 1.7 g / cm ^3））。对根区水质模型（RZWQM）进行了校准，并通过实验数据进行了验证，然后用于模拟2004年至2016年不同容重下的土壤水分和作物产量。 T25处理的最高产量为7551公斤/公顷，多年作物的CV值最低，为31.9％，这意味着这种容重的农作物的产量最稳定。土壤贮水量与生长期产量之间的关系近似线性，R ²为0.46。综合分析表明，该土壤的容重为0–40 cm –土壤容重= 1.2 g / cm ³；40–50厘米土壤容重= 1.5克/厘米³ 更有利于节水和农作物生长。