Spontaneous mixed woods in Nanjing Pearl Spring Scenic Area are messy in structure and simple in form,lack of layer and seasonable change,and poor in ornamental effect;hence,four renovation methods have been proposed....Spontaneous mixed woods in Nanjing Pearl Spring Scenic Area are messy in structure and simple in form,lack of layer and seasonable change,and poor in ornamental effect;hence,four renovation methods have been proposed.First,it is the renovation of both sides of roads,that is,the renovation of roadside trees and ornamental shrubs and ground covers at both sides of roads;second,it is the plants disposition on waterfront forest lands,that is,the cultivation of wet tolerating and ornamental trees,wet tolerating native trees,flowering or leaf-viewing ground covers and ferns in waterfront areas;third,it is the renovation of forest form of the offshore area,that is,retaining original key tree species and conducting proper adjustment according to landscape requirement and trees' characters;forth,it is the renovation of distant forest form,that is,accelerating natural evolution by artificial measures based on current natural plants community.Finally,the development of Nanjing Pearl Spring Scenic Area has been predicted.展开更多
Through the development in recent years, China's under-forest breeding pattern can be divided into four kinds of practice form of under-forest breeding pattern (the pattern of breeding driven by leading enterprise...Through the development in recent years, China's under-forest breeding pattern can be divided into four kinds of practice form of under-forest breeding pattern (the pattern of breeding driven by leading enterprises; the pattern of breeding driven by intermediary economic organizations; the pattern of breeding driven by the professional wholesale market; the pattern of breeding driven by the modern animal husbandry demonstration areas), according to difference in the main body participating in signing the operation contract in breeding pattern. In the production practice of under-forest breeding pattern, the most widely used and successful pattern is the pattern of breeding driven by leading enterprises and its derivative forms.展开更多
Understanding the effects of elevation and related factors(climate,vegetation) on the physical and chemical soil properties can help to predict changes in response to future climate or afforestation forcings.This work...Understanding the effects of elevation and related factors(climate,vegetation) on the physical and chemical soil properties can help to predict changes in response to future climate or afforestation forcings.This work aims to contribute to the knowledge of soil evolution and the classification of forest soils in relation to elevation in the montane stage,with special attention to podzolization and humus forms.The northern flank of the Moncayo Massif(Iberian Range,SW Europe) provides a unique opportunity to study a forest soils catena within a consistent quartzitic parent material over a relatively steep elevation gradient.With increasing elevation,pH,base saturation,exchangeable potassium,and fine silt-sized particles decrease significantly,while organic matter,the C/N ratio,soil aggregate stability,water repellency and coarse sand-sized particles increase significantly.The soil profiles shared a set of properties in all horizons:loamy-skeletal particle-size,extreme acidity(pH-H_2O<5.6) and low base saturation(<50%).The most prevalent soil forming processes in the catena include topsoil organic matter accumulation and even podzolization,which increases with elevation.From the upper to lower landscape positions of wooded montane stage of the Moncayo Massif,mull-moder-mor humus and an UmbrisolCambisol-Podzol soil unit sequences were found.展开更多
文摘Spontaneous mixed woods in Nanjing Pearl Spring Scenic Area are messy in structure and simple in form,lack of layer and seasonable change,and poor in ornamental effect;hence,four renovation methods have been proposed.First,it is the renovation of both sides of roads,that is,the renovation of roadside trees and ornamental shrubs and ground covers at both sides of roads;second,it is the plants disposition on waterfront forest lands,that is,the cultivation of wet tolerating and ornamental trees,wet tolerating native trees,flowering or leaf-viewing ground covers and ferns in waterfront areas;third,it is the renovation of forest form of the offshore area,that is,retaining original key tree species and conducting proper adjustment according to landscape requirement and trees' characters;forth,it is the renovation of distant forest form,that is,accelerating natural evolution by artificial measures based on current natural plants community.Finally,the development of Nanjing Pearl Spring Scenic Area has been predicted.
基金Supported by Business Management Cultivation Discipline of Southwest University Rongchang CampusSocial Science Planning Project in Chongqing City(2008-JJ10)
文摘Through the development in recent years, China's under-forest breeding pattern can be divided into four kinds of practice form of under-forest breeding pattern (the pattern of breeding driven by leading enterprises; the pattern of breeding driven by intermediary economic organizations; the pattern of breeding driven by the professional wholesale market; the pattern of breeding driven by the modern animal husbandry demonstration areas), according to difference in the main body participating in signing the operation contract in breeding pattern. In the production practice of under-forest breeding pattern, the most widely used and successful pattern is the pattern of breeding driven by leading enterprises and its derivative forms.
基金supported by project CGL2013-43440-R,funded by the Ministerio de Economiay Competitividad of Spain
文摘Understanding the effects of elevation and related factors(climate,vegetation) on the physical and chemical soil properties can help to predict changes in response to future climate or afforestation forcings.This work aims to contribute to the knowledge of soil evolution and the classification of forest soils in relation to elevation in the montane stage,with special attention to podzolization and humus forms.The northern flank of the Moncayo Massif(Iberian Range,SW Europe) provides a unique opportunity to study a forest soils catena within a consistent quartzitic parent material over a relatively steep elevation gradient.With increasing elevation,pH,base saturation,exchangeable potassium,and fine silt-sized particles decrease significantly,while organic matter,the C/N ratio,soil aggregate stability,water repellency and coarse sand-sized particles increase significantly.The soil profiles shared a set of properties in all horizons:loamy-skeletal particle-size,extreme acidity(pH-H_2O<5.6) and low base saturation(<50%).The most prevalent soil forming processes in the catena include topsoil organic matter accumulation and even podzolization,which increases with elevation.From the upper to lower landscape positions of wooded montane stage of the Moncayo Massif,mull-moder-mor humus and an UmbrisolCambisol-Podzol soil unit sequences were found.
