Influence of Water Level Change on Growth of Taxodium ascendensPlantation at Fluctuation Zone in Thousand Island Lake

In February 1992, 3-year Taxodium ascendens saplings were planted at water level fluctuating zone (WLFZ) of Thousand Island Lake withthe elevation 102.3m-103.5 m, Chunan county, Zhejiang province. Investigations were conducted in 2016 on permanent sample plot. The resultsshowed that conservation rate was 81.0%, with average height of 11.36 m, average height of 5 plus individuals of 14.86 m, the highest of 15.5 m.Average clear bole height was 3.04 m, average DBH 25.95 cm, the largest DBH 37.0 cm, and average crown diameter was 24.42m2. Statistical ofwater level changes of the Thousand Island Lake during 1992-2015 demonstrated that the first four years of the plantation was submerged by waterflooding some days, and later, trunks were meanly submerged under 5m of water for 4 days, 4 m for 15 days, 3m for 26 days, 2 m for 48 days, and 1m for 58 days each year. The plantation went through dry and wet season each year, with good growth, indicating that T. ascendens could adapt towater level fluctuating zone in Thousand Island Lake.