木麻黄人工林细根分解过程中的养分释放及能量归还  

Nutrient Release and Energy Return of Fine Roots in Casuarina equisetifolia Plantation

作　　者：张立华[1] 叶功富[2] 林益明[1] 卢昌义[3] 侯杰[4] 

机构地区：[1]厦门大学生命科学学院,福建厦门361005 [2]福建省林业科学研究院,福建福州350012 [3]厦门大学海洋与环境学院,福建厦门361005 [4]闽江学院,福建福州350108

出　　处：《厦门大学学报（自然科学版）》2007年第2期268-273,共6页Journal of Xiamen University：Natural Science

基　　金：国家"十一五"科技支撑计划项目;国家林业局南方山地用材林培育重点实验室资助

摘　　要：2005年1月到2006年1月在福建沿海惠安赤湖林场利用分解袋法对18 a生木麻黄人工林细根分解过程中营养元素的变化及养分归还进行了研究,结果表明:在分解过程中,C、Ca含量呈上升与下降交替进行的倒“S”型,且波动幅度越来越小,N、P的浓度总体呈现逐渐增加的趋势,K的浓度在分解前3个月急剧下降此后变化平缓,Mg则在分解过程中有升有降.木麻黄细根分解过程中养分浓度的变化与地上部分相似.分解一年之后,细根分解都表现为养分释放,K的损失率最高,达91.41%,其次是Mg和Ca,再次是C和N,P的损失百分率最低.18 a生木麻黄人工林每年通过细根枯死向土壤归还的N、P、K、Ca、Mg养分分别为4.911、-0.017、4.933、2.160、0.416 kg/hm2.木麻黄人工林细根年能量归还量、年能量净生产量、年细根能量归还比分别为33.4×106kJ/hm2、91.35×106kJ/hm2和36.56%,细根年能量分解损失量可达56.94%.Nutrient release and energy return during the fine roots decomposition in 18-year-old Casuarina equisetifolia plantation were studied in Chifu Forestry Farm of Huian county,Fujian province from January 2005 to January 2006. The results showed as follows..C and Ca contents fluctuated with the decomposition,N and P contents both increased,while K content declined rapidly during the first 3 months,and then changed little. The Mg content changed without a consistent pattern. The dynamics of nutrients of fine roots during the decomposition followed the similar trend with above-ground component. During one-year decomposition period, the nutrient release indicated that K was fastest, followed by Mg and Ca, and then C and N, while P was slowest. Annual returns of N,P, K,Ca and Mg through the decomposition of fine roots in 18-year-old C. equisetifolia plantation were 4. 911,-0. 017,4. 933,2. 160, 0. 416 kg/hm^2 ,respectively. Annual return of energy,annual net production of energy and the return ratio were 33.4 × 106 kJ/hm^2 , 91.35× 106 kJ/hm^2 and 36.56 % respectively. 56.49 % loss of energy through dead fine roots occurred for a year.

关 键 词：木麻黄 细根 分解 养分释放 能量归还 

分 类 号：S718.5[农业科学—林学]