磷输入对闽江河口芦苇枯落物分解的影响  

Effect of Phosphorus Input on Litter Decomposition of Phragmites australis in Estuary of Min River

作　　者：林伟[1] 陈晓艳[1] 曾从盛[1,2,3] 章文龙[1] 

机构地区：[1]福建师范大学地理科学学院,福建福州350007 [2]湿润亚热带生态-地理过程省部共建教育部重点实验室,福建福州350007 [3]福建师范大学亚热带湿地研究中心,福建福州350007

出　　处：《绵阳师范学院学报》2014年第11期57-61,70,共6页Journal of Mianyang Teachers＇ College

摘　　要：基于室内培养法,笔者研究了磷(P)输入对闽江河口芦苇(Phragmites australis)枯落物分解的影响,并同步测定了不同分解期枯落物碳(C)、氮(N)、磷(P)含量及土壤相关的理化性质,探讨了P输入对芦苇枯落物分解影响的可能机制.结果表明:P输入显著增加了土壤速效P含量(P<0.05),在第60 d时,P输入组和对照组的速效P含量分别为1.78 mg·kg-1和0.45 mg·kg-1;第135 d,分别为2.27 mg·kg-1和0.95 mg·kg-1.芦苇茎和叶的分解速率对P输入的响应不显著(P>0.05);芦苇茎和叶C、N、P含量在分解后期有所降低,但P输入对其影响均不显著(P>0.05).叶片C/N在整个分解过程中相对稳定,茎的C/N则有明显升高;P输入显著降低了叶的C/P和N/P(P<0.05),而对茎的影响并不显著(P>0.05).叶和茎的C、N、P积累系数(NAI)均小于100%,预示着各元素均发生了净释放,但P输入对其释放的影响并不显著(P>0.05).Adopting the indoor culture method, position of the Phragmites australis from the estuary we studied the influence of phosphorus input on litter decom- of Min River, measured the decomposition amounts of C, N, P and the physical and chemical properties of soil at different stages of litter decomposition, to reveal the possible causes of P input effect on litter decomposition of Phragmites australis. The results from our study showed that P input significantly increased available phosphorus contents of soil （ P 〈 0.05 ）. at the 60th day of our experiment, the available P contents of soil between P input group and the control group were 1.78 mg · kg^-1and 0.45 mg · kg^-1 , respectively, and 2.27 mg · kg^-1 and 0.95 mg · kg^-1 by the 135th day. there were no significant correla- tion between F input and the decomposition rate of stems and leaves （P 〉 0.05 ）. C, N and P contents of Phrag- mites australis stems and leaves decreased during the later stage of litter decomposition but there was insignificant influence P input on the contents of these three elements in stem and leaves （ P 〉 0.05 ）. During the whole process, C/N rate in leaves was relatively stable, but increased in stems （ P 〉 0.05 ）. P input significantly re- duced C/P rate and N/P rate in leaves （ P 〈 0.05 ）, but had no significant influence on stems （ P 〉 0.05 ）. During the process of decomposition, accumulation coefficient of C, N and P （NAI） was less than 100 percent. Ele- ment release was net, and P input had no significant influence on the release of C, N and P （P 〉 0.05 ）.

关 键 词：P输入 枯落物 分解速率 芦苇 闽江河口 

分 类 号：Q948[生物学—植物学] X171[环境科学与工程—环境科学]