Biological Cycling of Nutrient Elements of Two Plantations in Southeast Coastal Area, China
Standard plot method was used to study the concentration,accumulation,distribution and biological cycling of five nutrient elements (N,P,K,Ca,Mg) of 8-year-old Acacia cincinnata plantation (AP) and Casuarina equisetifolia plantation (CP) on a sandy coastal plain soil in southeast Fujian Province,China.The results showed that nutrient contents in the leaves were the highest among those in different organs of AP and CP,with the lowest in the stems.In these plantations,concentration of N was the highest among the five elements,followed by Ca,K and Mg,while P was the lowest in various organs.The total nutrient accumulations were 282.79 and 1 160.25 kg · hm-2 in pure AP and CP,respectively.The nutrient accumulation of various organs was ranked as branches ＞ stems ＞ barks ＞ leaves ＞ roots in the AP and leaves ＞ branches ＞ stems ＞bark ＞ roots in the CP.Changes in accumulation of various nutrients in AP (N＞K＞Ca＞Mg＞P),which were different from CP (N＞Ca＞K＞Mg＞P).Annual net nutrient accumulation,return and absorption were 35.35 and 140.61 kg· hm-2 · a-1,61.66 and 172.04 kg · hm-2 · a 1 and 97.01 and 312.65 kg· hm-2 · a 1intheAPandCP.Nutrient cycling coefficient,the utilization coefficient and the recycling period of AP and CP were 0.64 and 0.54,0.34 and 0.27,4.59 and 6.74 a,respectively.The utilization coefficient and cycling coefficient of five nutrient elements were Mg＞ Ca＞N＞P＞K in these plantations,and higher in AP than CP,soil fertility and the nutrient supply were improved in AP.Phosphorus was a key nutrient element for A.cincinnata growth,therefore it should be taken to improve the forest productivity of P fertilizer.
国家科技期刊平台
NSTL
万方数据
维普
