Annual variation of Longan litter fall and the annual flows on eroded slope orchard of Fujian
LI Fa-Lin-；Huang-Tan-He-；Ca-Zhi-Fa-；Xie-Jin-Sheng
1.Fujian Institute of Tropical Crops, 363001, Zhangzhou, Fujian;2.College of Resources and Environment Science, Fujian Agriculture and Forestry University, 35000, Fuzhou; 3.Zhangzhou Soil and Water Conservation Office;4.Xiangcheng Soil and Water Conservation Office: 363000, Zhangzhou, Fujian: China
Abstract：Seasonal dynamics and nutrient concentrations in litter fall and the annual flows of N, P, K, Ca and Mg were studied in Longan orchard systems on eroded slope orchard of Fujian. The result showed that annual litter fall of them were 48.153kg.The percentage of tree, leaf, branch, flower and fruit is 32.41%, 13.15%, 1.97% and 52.47% respectively. There is single litter fall peak in August and the amount is 29.115kg, amounting to 60.01% of whole year. Variation of N, P and K content is smaller than Ca and Mg content in leaf litter fall. The annual flows of N, P, K, Ca and Mg by litter fall were 697.91kg/hm2 and its order is as follows: Ca>K>Mg>P>N（446.02>115.73>74.31>37.47>24.39, kg/hm2）. The orchard achieve cycles of them by leaf and fruit mainly. The concentrations of N, P and K in the leaves after falling are lower than mature leaves, because those elements transfer before leaf falling, but there are differences among three elements that Ca doesn't transfer in the leaves and the movement of Mg has differences in different months. Annual return amounts of N, P and K before the leaves falling is7.420, 6.374 and 53.152kg/hm2, the most return amounts of which is3.632, 3.762, and 21.920kg/hm2 in September respectively.
李发林1；黄炎和2；蔡志发3；谢晋生4. 福建侵蚀坡地果园龙眼凋落物的年变化及库流量[J]. 中国水土保持科学, 2005, 3(2): 87-91.
LI Fa-Lin-；Huang-Tan-He-；Ca-Zhi-Fa-；Xie-Jin-Sheng. Annual variation of Longan litter fall and the annual flows on eroded slope orchard of Fujian. SSWCC, 2005, 3(2): 87-91.
2005, Vol. 3 
