玫瑰香葡萄棚栽技术

在对玫瑰香葡萄春暖棚扣棚前管理、扣棚时机、环境管理、土肥水管理、花果管理、生长季修剪、病虫防治、采收和采后管理8个环节存在的问题进行分析的基础上,提出了针对性的应对措施。     

珍珠油杏优质丰产栽培技术

经过5年的栽培试验,总结出了一套珍珠油杏土肥水管理、整形修剪、病虫防治的丰产栽培技术,以供果农参考.     

猕猴桃丰产栽培关键技术

从园地选择、品种选择、建园、田间管理、整形修剪与病虫害防治6个方面,介绍了猕猴桃各阶段配套管理技术,以期为推进猕猴桃产业发展提供技术支持.     

油用牡丹的发展优势及其丰产栽培管理技术

从发展优势、品种选择、建园选择、园地整理、定植苗木、整形修剪、、土肥水管理、病虫害防治、果实采收等方面总结油用牡丹的管理技术     

甜樱桃早期丰产栽培技术

从园地选择与栽植、整形修剪、花果及肥水管理、病虫害防治等方面,介绍了甜樱桃早期丰产栽培技术,供参考。     

早酥梨低产梨园改造丰产栽培技术

2011~2015年对早酥梨低产梨园进行了技术改造,改造后的早酥梨园,产量明显提高,而且品质优,病虫害较少,该项技术为低产早酥梨园提高果品质量和产量,增加果农收入,提供科学依据。     

浅析园林绿化执法工作存在的问题及对策

通过总结分析园林绿化执法工作存在的不足和原因,提出相应的对策。     

A review of stand basal area growth models

Growth and yield modeling has a long history in forestry. The methods of measuring the growth of stand basal area have evolved from those developed in the U.S.A. and Germany during the last century. Stand basal area modeling has progressed rapidly since the first widely used model was published by the U.S. Forest Service. Over the years, a variety of models have been developed for predicting the growth and yield of uneven/even-aged stands using stand-level approaches. The modeling methodology has not only moved from an empirical approach to a more ecological process-based approach but also accommodated a variety of techniques such as: 1) simultaneous equation methods, 2) difference models, 3) artificial neural network techniques, 4) linear/nonlinear regres-sion models, and 5) matrix models. Empirical models using statistical methods were developed to reproduce accurately and precisely field observations. In contrast, process models have a shorter history, developed originally as research and education tools with the aim of increasing the understanding of cause and effect relationships. Empirical and process models can be married into hybrid mod-els in which the shortcomings of both component approaches can, to some extent, be overcome. Algebraic difference forms of stand basal area models which consist of stand age, stand density and site quality can fully describe stand growth dynamics. This paper reviews the current literature regarding stand basal area models, discusses the basic types of models and their merits and outlines recent progress in modeling growth and dynamics of stand basal area. Future trends involving algebraic difference forms, good fitting variables and model types into stand basal area modeling strategies are discussed.