This paper analyzed necessity and laws of natural and cultural resource consumption and creation activities as a branch of economics or research direction, proposed such basic frameworks of landscape economics such as...This paper analyzed necessity and laws of natural and cultural resource consumption and creation activities as a branch of economics or research direction, proposed such basic frameworks of landscape economics such as connotations, basic problems and research methods on the basis of sorting out literature. Landscape economics is a social science focusing on the public preferences for natural and humanistic landscapes, and the preference evolution laws, economic laws of landscape resource consumption and creation activities. The basic problems include evaluation of landscape resource value, optimal utilization of landscape resources, landscape resource development and protection policies, formation and creation of diversified landscape structure. The research methods include investigation of consumers' willingness, experiment and behavioral economics, logical reasoning, and case study.展开更多
Forest phenotypic responses are significantly influenced by extreme climate conditions,particularly canopy structure and photosynthetic traits.However,the underlying mechanisms driving these responses,especially in co...Forest phenotypic responses are significantly influenced by extreme climate conditions,particularly canopy structure and photosynthetic traits.However,the underlying mechanisms driving these responses,especially in conifer species,remain poorly understood.This study employs advanced phenotyping technologies,combining three-dimensional(3D)canopy reconstruction with high-resolution physiological trait analysis,quantifying changes in key physiological traits that light interception,gas exchange parameters stomatal conductance,and chlorophyll content.Developing 3D reconstruction algorithms tailored to conifer canopies is essential for simulating forest ecosystem responses under varying canopy densities.We investigate the following questions:(1)How does thinning affect canopy light penetration and photosynthetic efficiency?Thinning significantly increased light penetration from 15%(CK)to 22%,enhancing photosynthetic efficiency,resulting in an 18%increase in carbon absorption under drought conditions.(2)How does reduced-rainfall affect photosynthetically active radiation(PAR)and stomatal conductance?Reduced-rainfall caused a 12%decrease in PAR,a 20%reduction in stomatal conductance,and an 8%decrease in chlorophyll content.(3)What are the synergistic effects of thinning and reduced-rainfall in carbon absorption?Thinning under reduced-rainfall increased carbon absorption by 25%.This study reveals a significant correlation between chlorophyll content,leaf nitrogen content,and canopy structural dynamics under drought and elevated temperature conditions,offering new in-sights into the adaptive mechanisms plants employ to adjust their photosynthetic processes.In conclusion,the development of 3D reconstruction algorithms tailored for conifer canopies,in regulating photosynthetic traits,is crucial for improving forest adaptation,contributing to functional trait-based forest management and ecosystem modeling.展开更多
文摘This paper analyzed necessity and laws of natural and cultural resource consumption and creation activities as a branch of economics or research direction, proposed such basic frameworks of landscape economics such as connotations, basic problems and research methods on the basis of sorting out literature. Landscape economics is a social science focusing on the public preferences for natural and humanistic landscapes, and the preference evolution laws, economic laws of landscape resource consumption and creation activities. The basic problems include evaluation of landscape resource value, optimal utilization of landscape resources, landscape resource development and protection policies, formation and creation of diversified landscape structure. The research methods include investigation of consumers' willingness, experiment and behavioral economics, logical reasoning, and case study.
基金This work is supported by the Fundamental Research Funds of CAF(CAFYBB2023QA001)State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau,Northwest A&F University,Yangling 712100 Shaanxi,P.R.China(F2010121002-202429)+1 种基金The National Key Research and Development Program of China(2023YFD2200801)National Natural Science Foundation of China(General Program)(32371862).
文摘Forest phenotypic responses are significantly influenced by extreme climate conditions,particularly canopy structure and photosynthetic traits.However,the underlying mechanisms driving these responses,especially in conifer species,remain poorly understood.This study employs advanced phenotyping technologies,combining three-dimensional(3D)canopy reconstruction with high-resolution physiological trait analysis,quantifying changes in key physiological traits that light interception,gas exchange parameters stomatal conductance,and chlorophyll content.Developing 3D reconstruction algorithms tailored to conifer canopies is essential for simulating forest ecosystem responses under varying canopy densities.We investigate the following questions:(1)How does thinning affect canopy light penetration and photosynthetic efficiency?Thinning significantly increased light penetration from 15%(CK)to 22%,enhancing photosynthetic efficiency,resulting in an 18%increase in carbon absorption under drought conditions.(2)How does reduced-rainfall affect photosynthetically active radiation(PAR)and stomatal conductance?Reduced-rainfall caused a 12%decrease in PAR,a 20%reduction in stomatal conductance,and an 8%decrease in chlorophyll content.(3)What are the synergistic effects of thinning and reduced-rainfall in carbon absorption?Thinning under reduced-rainfall increased carbon absorption by 25%.This study reveals a significant correlation between chlorophyll content,leaf nitrogen content,and canopy structural dynamics under drought and elevated temperature conditions,offering new in-sights into the adaptive mechanisms plants employ to adjust their photosynthetic processes.In conclusion,the development of 3D reconstruction algorithms tailored for conifer canopies,in regulating photosynthetic traits,is crucial for improving forest adaptation,contributing to functional trait-based forest management and ecosystem modeling.
