China’s forestry informatization has entered the stage of smart forestry，and the new generation of information technology plays an important role in the smart forestry. Based on the connotation and development path of smart forestry, this paper refines the system architecture of smart forestry, expounds the research status of key technologies in smart forestry, such as Internet of Things, 3S and BeiDou Navigation, Cloud Computing, Big Data, Mobile Internet, etc., analyzes its main problems, and discusses its development trend and research focus. It is showed that there are some problems in the research of the key technologies of smart forestry in China, such as incomplete infrastructure, high cost, inconsistent technical standards, weak information interconnection, unstable data quality, data mining not deep enough, insufficient technology integration and lack of professional and technical talents. It is suggested that the research focus of the key technologies in China’s smart forestry in the future will be on four aspects: forestry data mining and deep application, forestry cloud remote sensing big data research, forestry block data research, and the deep integration of forestry internet of things, cloud computing, and mobile internet.

Phosphorus is one of the essential nutrients for plant growth, and plays a crucial role in determining crop yield and quality. Due to the combined pressure of decreased arable land quality and soil phosphorus deficiency or low bioavailability, the improvement of soil phosphorus availability has become a global concern. The rotation of two or more crops has positive effects on soil improvement, crop production efficiency and the restoration of agricultural ecosystem function. This study reviews the research progress on the effects of crop rotation on soil physiochemical properties, soil phosphorus transformation, and soil micro-food web. Firstly, the relationship between soil properties and phosphorus transformation is analyzed to assess the impact of crop rotation on phosphorus availability. Secondly, from the perspective of soil micro-food web and gene regulation, the transformation and biogeochemistry cycle of soil phosphorus was analyzed at the molecular level. It is summarized that crop rotation can affect soil phosphorus transformation through altering soil physiochemical properties and micro-food network structure, which can improve soil phosphorus availability, and ultimately promote crop yield and quality. We indicate that crop rotation is an important agricultural management measure for improving soil phosphorus availability. It is suggested to strengthen the related research and explore the combination model of crop rotation in the future. It would provide powerful support for food security and crop quality, and is of great significance in social economy and ecological environment.