Control Techniques of Chinese Chestnut Yellow Crinkle

This paper initially delineates the symptoms,characteristics,and hazards associated with Chinese chestnut yellow crinkle,as well as the transmission and infection pathways of the disease.Additionally,it proposes the prevention and control strategies of the disease,including rigorous investigation and monitoring of the disease,enhanced monitoring of seedlings and scions,and integrated disease management techniques to promote the tree s health and vitality.These strategies serve to inform the prevention and control of Chinese chestnut yellow crinkle in production.

Review of Research on Nutritional Physiological Mechanism and Nutritional Diagnosis of Magnesium in Fruit Trees

Magnesium is an essential nutrient element for the growth and development of fruit trees.It not only participates in photosynthesis of plants,but also promotes physiological and biochemical reactions such as carbohydrate and protein synthesis,enzyme activation,and reactive oxygen species(ROS)metabolism.Magnesium deficiency in fruit trees will directly influence the growth and development of trees and the improvement of fruit quality.This study mainly reviews the nutritional and physiological mechanism of magnesium in plants and the nutritional diagnosis of magnesium deficiency in fruit trees,in order to provide a theoretical basis for further research on magnesium nutrition in fruit trees,and accordingly provide a certain reference for the application of magnesium fertilizer.

绿色信贷政策与企业环保投资

本文以2012年《绿色信贷指引》政策的颁布为准自然实验,以2008—2020年全国沪、深A股上市公司为样本,运用双重差分法考察绿色信贷政策对重污染行业企业环保投资的影响。研究表明:绿色信贷政策的实施通过绿色信贷约束机制倒逼重污染行业企业加大环保投资。媒体负面关注越多,绿色信贷政策对环保投资的提升效应越明显;商业信用降低绿色信贷政策对重污染行业企业环保投资的提升效应;重污染企业外部融资依赖度越高,绿色信贷政策对环保投资的提升效应越大。绿色信贷政策对重污染企业的环保投资的提升效应在国有企业、大规模企业更明显;在金融发展水平低的地区、东部地区绿色信贷政策对环保投资的影响小,而中西部地区受绿色信贷政策的影响较大。本文的研究结论为绿色信贷政策对环保投资的激励作用提供了经验证据。