The Effects Of Drought And Climate Warming On Non-structural Carbohydrates Of Larix Gmelinii

Dahurian larch (Larix gmelinii Rupr.) as the dominant species of the boreal forest in China has the characteristics of strong adaptability,such as fast growth,short growth cycle, cold tolerance and its wide distribution.Susceptible to environmental factors affect its non-structural carbohydrates and component characteristics of not only its physiological function closely related and reflect the response of trees to environmental change and adapt.To study the impact of climate change on the Larix reveal Larix in the face of climate change coping strategies, preliminary analysis of the changes affecting the dominant ecological factors provide a basis for further reveal Lite An ecological Larch response to climate change adaptation strategies data.This study uses precipitation method and response control study Larix latitude gradient method to drought and climate warming.Analysis of the non-structural carbohydrates and component concentrations, soil moisture, nitrogen content of different control Larix precipitation treatment, different kinds of sources.The main findings are as follows:(1)Control rainfall test:The experiment included three treatments:100%rainfall exclusion (100%RE),50%rainfall exclusion (50%RE) and control (CK, i.e., ambient rainfall). The results showed that the NSC concentrations in the needles responded to the rainfall exclusion treatments more sensitively than those in twigs. However, the concentration of soluble sugars in needles differed significantly among the treatments (P<0.05). There was a significant negative relationship between soil moisture and concentration of soluble sugars and ratio of sugar to starch in needles (P<0.05). The concentration of starch in needles tended to increase with soil moisture increasing, but their correlation was insignificant (P>0.05). There was no significant correlations between soil moisture and the total NSC concentration in needles, and between soil moisture and the concentrations of total NSC or component concentrations in twigs (P>0.05). We concluded that the larch trees show little response to short-term drought stress in terms of NSC concentrations and have the capability of transforming starch into soluble sugars to sustain their physiological activities during the short-term drought period.(2)Warming experiment:Research shows that provenance of Larix fine root soluble sugar concentration, total NSC concentration, the concentration of soluble sugars and starch concentration ratio were exhibited with decreasing latitude and increasing trend, and the difference was significan(P<0.05)t. From the comparison of transplanting ground and provenance of Larix we found that NSC and its components located Larix concentration of low-latitude provenance was significantly higher than the concentration of provenance. And starch concentration provenance starch concentration was significantly lower than transplanting ground(P<0.05), indicating that at high latitudes, Larix starch down into soluble sugars by way of cold...