Studies On Assignment Of N,P,K,Ca,Mg In Orchard Ecosystems

This is a typical orchard ecosystem,which consits of plant-grass in East-Fujian.the article study the distribution of N, P, K, Ca, Mg.In orchard ecosystem of each part and the storage accounts of each storeroom and the litterfall of longan part-system and the analysis characteristic of dead body of vegetation part-system.The result show that in soil part-system ,which is the main storeroom of N, P, K, the storage accounts for 97.37%. 99.69%. 99.90%,respectively,of the total in soil-vegetation system ,the storage ration of N. P. Kin soil and being room is 37.1:1. 306.3:1. 1005.0:l,and with the increasing of death the mass fractions of N, P decrease but those of K do not very obviously in soil part-system.In fruit tree part-system,the highest mass fractions of N. P. Kare in the blade and the highest storage is in the room in vegetation (grass)system,the mass fractions of N, P. K above ground is higher ,and the storage of N underground is higher, but that of P, K above ground is higher.Annual litterfall of them were 48153g.The different part of tree . leaf . branch > flower and fruit,respectively is 32.41%. 13.15%. 1.97%and 52.47%.there is single litterfall peaked in august,and the litterfall amount is 29115g,60.01% of annual year. Changes of N. P. K concentrations were smaller than Ca and Mg concentrations in leaf litterfall..The five elementaccumulation were 3163.96g and is as follows:Ca>K>Mg>P>N. The fiveelement respectively is 48.16%, 9.11%, 1.84% inlitterkleaf , fruit, branch, flower.The orchard achieve cycles of them by leaf and fruit mainly .The nutrient of efficiency is as foliows:N>P>Mg>K>Ca,and N maybe is the narrowest nutient,secondly P,thirdly Mg.The available amounts of N, P, K, Ca, Mg in litterfall is 2.03, 2.90, 12.96, 38.73 and 8.61g/kg and the availableamounts of leaf, branch, flower and fruit is 96.93, 45.21 , 60.66, 50.83g/kg.The total amounts of litterfall is 65.13g/kg .The contents were best and Pcontents were greater than N contents in them .The concentration of N, P, K in leaf litterfall were smaller than in leaf that before gallen. There were obviously movement before the leaf fell,but they also have the difference among them,Ca cannot be movement and Mg have change in difference months.Vegetation litterfall is 15.75kg/m2.The storage of five elements 57.80, 75.13 , 245.70, 303.50,114.50g,N, K contents in dead body have sorely change ,the contents of P, Ca, Mg in dead body have single change.the total storage of the five elements of the orchard ecosystem is 1139.02kg/hm2,and longan is main part.