林火是森林生态系统碳循环的重要影响因子。火干扰引起的土壤碳通量变化会直接影响森林生态系统的碳循环过程。以苏州市光福镇潭山2016年森林火灾后的火烧迹地为研究区域,对不同强度(轻度、中度)火烧迹地和未过火区域(对照)的土壤呼吸...林火是森林生态系统碳循环的重要影响因子。火干扰引起的土壤碳通量变化会直接影响森林生态系统的碳循环过程。以苏州市光福镇潭山2016年森林火灾后的火烧迹地为研究区域,对不同强度(轻度、中度)火烧迹地和未过火区域(对照)的土壤呼吸速率进行测定。结果表明,火干扰导致该地区一年后土壤呼吸速率显著升高,且中度火烧>轻度火烧>未过火;轻度、中度火烧迹地和对照样地土壤呼吸速率的数值分别为(3.43±0.15)μmol CO2 m-2 s-1、(3.84±0.28)μmol CO2 m-2 s-1、(3.02±0.26)μmol CO2 m-2 s-1。通过进一步对土壤温湿度测定表明,火烧后土壤温度和土壤含水率对土壤呼吸速率的影响均为正相关且前者影响更为显著。研究结果对苏南地区火干扰后森林生态系统碳循环变化的研究具有重要意义。展开更多
Air pollution as one of the major environmental issues in modern society,has already brought severe impact to human life and production,thus it is an urgent task for studying environmental and ecological science to so...Air pollution as one of the major environmental issues in modern society,has already brought severe impact to human life and production,thus it is an urgent task for studying environmental and ecological science to solve this issue that has bothered human society for the last centuries.Scientists have endeavored to figure out the laws of atmospheric pollutant diffusion using various mathematical models and statistical models,and drawn some precious conclusions.This paper explored the basic model of atmospheric diffusion—modeling and solution of Gaussian Diffusion Model,clarify its principles and operation forms,then applied the model into the PM_(2.5) atmospheric diffusion cases,make the program planning base on the results of model calculation,and get the final conclusion.展开更多
There exists large-scale lightning in Saturn's water cloud. Based on the powerful moist convection in the water cloud, we establish a thermal-induced convective model to interpret the mechanism for the processes o...There exists large-scale lightning in Saturn's water cloud. Based on the powerful moist convection in the water cloud, we establish a thermal-induced convective model to interpret the mechanism for the processes of charge generation and separation. We also estimate the breakdown field of Saturn's atmosphere quantitatively and interpret the discharge process.展开更多
文摘林火是森林生态系统碳循环的重要影响因子。火干扰引起的土壤碳通量变化会直接影响森林生态系统的碳循环过程。以苏州市光福镇潭山2016年森林火灾后的火烧迹地为研究区域,对不同强度(轻度、中度)火烧迹地和未过火区域(对照)的土壤呼吸速率进行测定。结果表明,火干扰导致该地区一年后土壤呼吸速率显著升高,且中度火烧>轻度火烧>未过火;轻度、中度火烧迹地和对照样地土壤呼吸速率的数值分别为(3.43±0.15)μmol CO2 m-2 s-1、(3.84±0.28)μmol CO2 m-2 s-1、(3.02±0.26)μmol CO2 m-2 s-1。通过进一步对土壤温湿度测定表明,火烧后土壤温度和土壤含水率对土壤呼吸速率的影响均为正相关且前者影响更为显著。研究结果对苏南地区火干扰后森林生态系统碳循环变化的研究具有重要意义。
基金Program of Regional Tourism Development and Rural Revitalization Coordination Center (2020Z04)。
文摘Air pollution as one of the major environmental issues in modern society,has already brought severe impact to human life and production,thus it is an urgent task for studying environmental and ecological science to solve this issue that has bothered human society for the last centuries.Scientists have endeavored to figure out the laws of atmospheric pollutant diffusion using various mathematical models and statistical models,and drawn some precious conclusions.This paper explored the basic model of atmospheric diffusion—modeling and solution of Gaussian Diffusion Model,clarify its principles and operation forms,then applied the model into the PM_(2.5) atmospheric diffusion cases,make the program planning base on the results of model calculation,and get the final conclusion.
基金supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (KZZD-EW-01-4, KZCX2-EW-QN501)National Natural Science Foundation of China (41074118, 40890163,41121003)
文摘There exists large-scale lightning in Saturn's water cloud. Based on the powerful moist convection in the water cloud, we establish a thermal-induced convective model to interpret the mechanism for the processes of charge generation and separation. We also estimate the breakdown field of Saturn's atmosphere quantitatively and interpret the discharge process.
