On the basis of the relationship between tree ring width of Pinus tabulaeformis in the southern Taihang Mountains in Hebei Province and climate factors, such as mean temperature, mean maximum temperature, mean minimum...On the basis of the relationship between tree ring width of Pinus tabulaeformis in the southern Taihang Mountains in Hebei Province and climate factors, such as mean temperature, mean maximum temperature, mean minimum temperature and precipitation, we find that tree-ring width correlates positively and significantly with mean and maximum temperature in March and Spring, and with minimum temperature in March, April, Spring and Autumn. The sampling tree radial growth responds sensitively to spring temperature change.展开更多
The relationships between the normalized difference vegetation index(NDVI)(1981-2006) in growing season and precipitation, NDVI and mean temperature(T_(mean)), NDVI and maximum temperature(T_(max)), NDVI and minimum t...The relationships between the normalized difference vegetation index(NDVI)(1981-2006) in growing season and precipitation, NDVI and mean temperature(T_(mean)), NDVI and maximum temperature(T_(max)), NDVI and minimum temperature(T_(min)), and NDVI and the Palmer Drought Severity Index(PDSI) were analyzed. The results indicated that NDVI during the growing season was mostly positively and significantly correlated with precipitation last month and the month before last, and mostly negatively with temperature. There were negative and significant correlation between NDVI in June and July and T_(mean)and T_(max)in May respectively, between April NDVI and T_(min)in February and March, and between June NDVI and T_(min)in April, May and June. Vegetation cover in growing season correlated positively with PDSI, especially those last month and the month before last at 0.05 significance level, even 0.01 level. Hydrothermal conditions from March to July had significant influence on vegetation cover.展开更多
基金Supported by the Science and Technology Plan Projects of Hebei Province(15454201D)
文摘On the basis of the relationship between tree ring width of Pinus tabulaeformis in the southern Taihang Mountains in Hebei Province and climate factors, such as mean temperature, mean maximum temperature, mean minimum temperature and precipitation, we find that tree-ring width correlates positively and significantly with mean and maximum temperature in March and Spring, and with minimum temperature in March, April, Spring and Autumn. The sampling tree radial growth responds sensitively to spring temperature change.
基金Supported by the Science and Technology Plan Projects of Hebei Province(15454201D)
文摘The relationships between the normalized difference vegetation index(NDVI)(1981-2006) in growing season and precipitation, NDVI and mean temperature(T_(mean)), NDVI and maximum temperature(T_(max)), NDVI and minimum temperature(T_(min)), and NDVI and the Palmer Drought Severity Index(PDSI) were analyzed. The results indicated that NDVI during the growing season was mostly positively and significantly correlated with precipitation last month and the month before last, and mostly negatively with temperature. There were negative and significant correlation between NDVI in June and July and T_(mean)and T_(max)in May respectively, between April NDVI and T_(min)in February and March, and between June NDVI and T_(min)in April, May and June. Vegetation cover in growing season correlated positively with PDSI, especially those last month and the month before last at 0.05 significance level, even 0.01 level. Hydrothermal conditions from March to July had significant influence on vegetation cover.
