US forestry scientists are responsible for the consequences of climate warming
US scientists do not just want to have proven that the Walder in the east of the United States are grown faster during the past 20 years than in the last 225 years, they also believe the probable reason to have found out. The development of the Walder is therefore important because they either act as CO2 lowering or as CO2 sources and thus influence the climate.
Forest scientists Geoffrey Parker and Sean McMahon have observed from Smithsonian Environmental Research Center 55 different rough Islands Mischwald in Waldern in Maryland. The tree casting – total were 20.000 tree measured – were different alt (5-225 years), which makes it possible to compare the growth age and young tree. After the quantities, the biomass of the forest per hectare is declined by 4.15 tons or. Mg grown. At 90 percent, the growth during the past 20 years, growth was expected to grow the expected growth – regardless of the age and location.
For the meng of growth, metal benders are laid around the ramming, which expand when the diameter of the tree increases. Image: Smithsonian
To explain the growth, as you write in your article, which has been published in the Proceedings of the National Academy of Sciences, you set a total of 6ps. For example, for accelerated growth, the increased inflation in agriculture could be possible, which also affects forest floor. The composition of goods another reason, fast-growing pioneers could prevail and thus explain the increase in biomass. But faster growth can also happen to be randomly in tree, when rough tree dying and make boys. For these three reasons, however, no evidence could be found.
Therefore, 3pplies remain with the climate permission: rising temperatures, long-sleeved growth periods and increasing CO2 concentration in atmosphere. The CO2 values in the region have increased by 12 percent during the past 22 years, the average temperature has become 0.3 degrees warm and the growth period has increased by 7.8 days. So the tree has more CO2 for photosynthesis and a week more to grow. The scientists believe that this reason is responsible for the Biomass Position of the Walder in the east of the USA. However, this growth has not increased in the last 20 years, but has remained largely constant. In addition, it could quickly reach an end when water or nutrients become scarce. Of course, does not matter how reprintage is the study for other Walder in other regions. And unknown is also whether there could be more reason for growth and which of the three intentional causes is crucial.