• ISSN 1008-505X
  • CN 11-3996/S

黑土地肥力下降成因与保护利用对策基于养分资源高效利用视角分析

Causes of fertility decline and countermeasures for protection and utilization of upland black soil—an analysis from the perspective of nutrient resources high-efficient utilization

  • 摘要: 黑土具有质地好、肥力高、适耕性强等特点,为全国贡献了1/4的粮食产量,但黑土地长期集约化利用引起的土壤肥力下降已引起国家和学者的广泛关注。本文分析了黑土地肥力下降主要特征,并着重从养分资源高效利用视角探讨了黑土地肥力下降的原因,提出了黑土地保护利用对策。黑土地肥力下降主要特征为有机质下降、结构变差、养分失衡、酸化严重和黑土层变薄等。从养分资源利用角度分析,黑土地肥力下降主要原因是黑土地集约化利用下秸秆长期移出农田,有机物料投入不足,以及化学肥料种类、用量、施用时间的不合理。为此,本文提出以养分高效利用为核心的养分精准管理、以秸秆还田为主的保护性耕作及以有机物料循环利用为基础的农牧一体化的综合管理对策。总之,黑土地养分高效循环利用是实现黑土地保护利用的重要手段之一。

     

    Abstract: Black soil has the characteristics of good texture, high fertility and well arability, which contributes one quarter of the total grain yield in China. However, the fertility decline of upland black soil due to long-term intensive utilization is being paid more attention. We analyzed the main characteristics of fertility decline of upland black soils, emphatically explored the causes of fertility decline of upland black soil and put forward countermeasures for the protection and utilization of upland black soil from the perspective of nutrient resources high-efficient utilization. The main characteristics of fertility decline of upland black soil are soil organic matter decline, soil structure deterioration, soil nutrient imbalance, soil serious acidification and thinning of black soil layer. From the perspective of nutrient resources high-efficient utilization, the main causes of fertility decline of upland black soil are the long-term straw removal out of soil, insufficient inputs of organic materials, and the unreasonable application of chemical fertilizers such as unsuitable nutrient types, rate, and time under the intensive utilization. Therefore, the integrated management countermeasures are sponsored, including the nutrients precision management based on the current nutrients high-efficient utilization technology, conservation tillage based on straw returned to soil as the primary practices, and integration system of soil-crop-animal production based on the nutrient recycling utilization of organic materials. In conclusion, the nutrients high-efficient recycling utilization is one of the important practices for the protection and utilization of upland black soil.

     

/

返回文章
返回