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Analysis of the Influence of Climate on Arceuthobium sichuanense

Chengming Tian: Beijing Forestry University

<div><strong>ABSTRACT</strong></p> <p>In recent years, with the global warming and extreme weather are more frequently, structure and types of forest are undergoing tremendous changes. <em>Arceuthobium sichuanense </em>is a parasitic seed plant disease that mainly harm to spruce trees, and causes a seriously economic loss in nature spruce forests of “san jiang yuan” areas recently. In this study, we tried to find out the suitable areas for <em>A. sichuanense </em>growth and the impact of climate change for <em>A. sichuanense</em> by using the niche models (GARP and MaxEnt) and dendrochronology. The result showed that suitable areas of <em>A. sichuanense </em>were mainly concentrated in Qinghai, Gansu, Sichuan, Xizang provinces, and the central areas of <em>A. sichuanense</em> cross the land of Qinghai, Gansu, Sichuan according to combine the prediction results of GARP and MaxEnt model with 4:1 weight. Interestingly, we also found that the suitable areas of <em>A. sichuanense </em>trended to expand to the northwest and southwest from 1961 to 2000. Additionally, we measured the width of tree rings of the infected spruce with disease index>3, and the results showed that the width of tree rings in1992 was significantly reduced compared to other years, which may cause by <em>A. sichuanense</em>. We also revealed that temperature showed more correlative with volume increasing of host trees compared to precipitation, and the temperature had inverse impact on healthy and sick spruce which had a positive influence on healthy spruce and a negative influence on sick spruce. Overall, our data would increase our knowledge on <em>A. sichuanense</em>, which may be helpful for the disease control.</p> <p><strong>Key words:</strong> <em>Arceuthobium sichuanense</em>, Climate change, Suitable areas, Temperature</p> <p><em></em></p> <p><em>The Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, China</em></p> <p><em>* </em><em>Correspondence </em><em>author</em><em>: </em><span><a href="";><;/a></span></div>