Authors

Abstract

The objective of ecological restoration and rehabilitation of grasslands is to recreate the original appearance of damaged or degraded vegetation. From previous research, the pneumatic spraying technology is now more commonly used in the world for vegetation restoration. Pneumatic spraying is relatively inexpensive and causes little damage to the original vegetation, making it one of the most effective techniques for restoring natural grassland vegetation under natural climatic conditions. In this paper, the effect of the spraying machine pipe working airflow on the quality of spraying was studied through simulation analysis and experimental tests. The seeding area of the spraying machine corresponding to different values of the pipe inlet airflow speed was determined. The conclusions show that: 1) the spray pipe inlet airflow velocity has a great influence on the uniformity of spraying. When the airflow velocity is higher than 55 m/s, the spraying is not uniform, while the airflow velocity is lower than 45 m/s, the spraying amplitude is smaller, the operational efficiency is low, which is not conducive to the restoration of degraded grasslands; 2) considering the uniformity of spraying and operational efficiency, the airflow velocity at the inlet of the spray pipe should be between 45 and 55 m/s when the spraying machine is in operation. The seed drop area is changed, by adjusting the airflow velocity of the spray pipe inlet, and the reseeding and leakage area of the seed drop area is reduced, so that the spraying performance of the spraying machine is optimized.

Abstract in Chinese

草原生态恢复与重建目标是再现被破坏或已退化植被原貌。从前期研究情况看，气力喷播技术目前在世界上应用于植被修复比较普遍。气力喷播技术成本相对较低，对原有植被破坏较小，是在自然气候条件下恢复天然草原植被的有效技术手段之一。本文通过仿真分析和试验测试研究了气力喷播机喷筒工作气流对喷播质量的影响，确定了不同数值喷筒入口气流速度所对应的喷播机落种区域。结论表明：1）喷筒入口气流速度对喷播均匀性有很大影响，当气流速度高于55 m/s时，喷播不均匀，当气流速度低于45 m/s时，喷播幅度较小，作业效率低，不利于退化草原修复；2）考虑喷播均匀性和作业效率，喷播机工作时喷筒入口气流速度应在45~55 m/s之间，且通过调节喷筒入口气流速度改变了种子的落种区域，减小了落种区域重播、漏播面积，实现了对喷播机喷播性能的优化。