The Effect Of Soil Trace Elements And Availability In Different Ginkgo Agroforestry Systems

Ginkgo agroforesty systems are very popular in the Ginkgo origin. To investigate thecontent of the soil trace elements in the long-term composite mode and provide a theoreticalbasis for trace elements in fertilizer application.In this paper, We compared the impacts of threeGinkgo-based systems and two reference systems (a conventional agrosystem with a sequentialrotation of wheat and peanuts WP;Gingko(G)), on annual dynamic of pH, soil organic matter,soil trace elements, and soil trace elements availability. The three Ginkgo-based systems were:Gingko, wheat and peanut (GWP); Gingko, rape and peanut (GRP); a Ginkgo and mulberry(GM). The results showed that:1Soil pH in WP system was higher than Ginkgo-based systems, and it decreased with theGinkgo growing in Ginkgo-based systems.2A higher soil organic matter was found in Ginkgo-based systems than WP systems, and italso increased with the Ginkgo growing.3There was no significant soil total Fe among all systems. However, Soil total Mo, Mn, Zn,and Cu were significantly lower in Gingko-based systems than WP.4Within2008-2012, there was no significant change in total Fe among different systems,as well as total Mo and Mn in WP system. However, total Cu and Zn decreased in G and GMsystems, while these two trace elements increased in other systems.5The availability Fe and Mn were significantly higher in Ginkgo-based systems than WPsystems, while the availability Cu, Zn, and Mo lower than WP systems.6The Soil availability Fe increased significantly in2008-2012under G and GM systems,while the availability Mo was deceased significantly in Ginkgo-based systems at the same times.However, for availability Mn, no significant difference was found in2008-2012. Meanwhile, theavailability Cu and Zn increased in2008-2012under GWP, GRP, and WP systems, but nosignificant difference was found in GM and G systems at the same time.7From the correlation analysis, soil pH was significantly positively correlated with soilavailability Mo and soil availability Mn. Soil organic matter was significantly positivelycorrelated with soil availability Fe, availability Cu, and availability Zn, while soil organic matterwas significantly positively correlated with availability Mo. Besides, the total trace elementswere significantly positively correlated with soil availability trace elements.