[Objectives]To investigate the dynamic evolution of vegetation index in Qinling Mountains from 2000 to 2019.[Methods]Based on MODIS13 NDVI data,the regularity of dynamics of vegetation index in Qinling Mountains from ...[Objectives]To investigate the dynamic evolution of vegetation index in Qinling Mountains from 2000 to 2019.[Methods]Based on MODIS13 NDVI data,the regularity of dynamics of vegetation index in Qinling Mountains from 2000 to 2019 was analyzed using maximum value composite method and trend analysis method.[Results]The NDVI in Qinling Mountains was in the range of 0.799-0.863 during 2000-2019.It showed a slow upward trend overall,and the growth rate was 0.033/(10 a).The area with declined NDVI accounted for 4.111%of the study area.It was distributed in the surrounding areas of cities,and was manly affected by the process of urbanization.The improved area accounted for 36.224%of the study area.It was widely distributed in Qinling Mountains,and was mainly affected by natural factors and national policies.[Conclusions]This study provides a basis for the protection of ecological environment and the sustainable development and utilization of resources in Qinling Mountains.展开更多
Based on the experience of soil sampling in Yuanzegou small watershed,several matters needing attention in soil field sampling are summarized.This paper focuses on the layout of sampling points,soil sample collection,...Based on the experience of soil sampling in Yuanzegou small watershed,several matters needing attention in soil field sampling are summarized.This paper focuses on the layout of sampling points,soil sample collection,soil sample preparation and matters needing attention about potential factors in soil field sampling,with a view to providing reference for undergraduates,master students or non-subject experimenters who are about to carry out experiments in this discipline.展开更多
基金Project of Shaanxi Provincial Land Engineering Construction Group(DJNY2021-33).
文摘[Objectives]To investigate the dynamic evolution of vegetation index in Qinling Mountains from 2000 to 2019.[Methods]Based on MODIS13 NDVI data,the regularity of dynamics of vegetation index in Qinling Mountains from 2000 to 2019 was analyzed using maximum value composite method and trend analysis method.[Results]The NDVI in Qinling Mountains was in the range of 0.799-0.863 during 2000-2019.It showed a slow upward trend overall,and the growth rate was 0.033/(10 a).The area with declined NDVI accounted for 4.111%of the study area.It was distributed in the surrounding areas of cities,and was manly affected by the process of urbanization.The improved area accounted for 36.224%of the study area.It was widely distributed in Qinling Mountains,and was mainly affected by natural factors and national policies.[Conclusions]This study provides a basis for the protection of ecological environment and the sustainable development and utilization of resources in Qinling Mountains.
文摘Based on the experience of soil sampling in Yuanzegou small watershed,several matters needing attention in soil field sampling are summarized.This paper focuses on the layout of sampling points,soil sample collection,soil sample preparation and matters needing attention about potential factors in soil field sampling,with a view to providing reference for undergraduates,master students or non-subject experimenters who are about to carry out experiments in this discipline.
