墨西哥柏人工林土壤-叶片碳氮磷化学计量特征对不同施N量的响应  

RESPONSES OF CNP STOICHIOMETRY TO N SUPPLY IN Cupressus Lusitanica MILL. PLANTATION

作　　者：李瑞瑞 卢艺 王益明 万福绪 LI Ruirui;LU Yi;WANG Yiming;WAN Fuxu(College of Forest,Nanjing Forestry University,Co-Innovation Centre for Sustainable Forestry in Southern China,Nanjing 210037,China)

机构地区：[1]南京林业大学林学院南方现代林业协同创新中心,南京210037

出　　处：《内蒙古农业大学学报（自然科学版）》2018年第6期26-32,共7页Journal of Inner Mongolia Agricultural University(Natural Science Edition)

基　　金：江苏省林业三新工程(LYSX[2015]20);PAPD资助项目

摘　　要：为探讨N添加对墨西哥柏人工林土壤、叶片碳氮磷含量及其生态化学计量特征变化的影响,共设置F0,F1(24kg hm-2a-1),F2(48 kg hm-2a-1),F3(72 kg hm-2a-1),F4(96 kg hm-2a-1),F5(120 kg hm-2a-1) 6个不同施N量处理。结果表明:(1)随施N量的增加土壤有机碳,全氮,全磷含量呈先升高后降低的趋势,并在F3样地取得最大值,分别是2. 50%,0. 22%,0. 13%。土壤C/N值随施肥量的增加而显著增加。但土壤N/P,C/P值随施肥量的增加呈降低-升高的趋势,在F2样地出现最低值,分别是0. 92,11. 01。(2)叶片CNP含量未受到N添加的显著影响,叶片C、N含量在F3样地取得最大值,分别为47. 89%,1. 50%,叶片P含量在F2样地取得最大值,为0. 24%。同样N添加对叶片C/N,C/P值并没有产生显著影响,(3)根据聚类分析可以发现,N添加对土壤、叶片碳氮磷含量及化学计量比的影响可以分为3组,其中F2可作为盱眙墨西哥柏人工林氮添加的参考。根据因子分析可以发现,土壤、叶片CNP化学计量比对N添加的响应比较灵敏。In order to provide a theoretical basis for the cultivation and sustainable management of Cupressus lusitanica Mill. plantation,the effects of different N levels on soil organic carbon,soil total nitrogen,soil total phosphorus,foliar CNP concentration,soil C: N: P ecological stoichiometry and foliar C: N: P ecological stoichiometry were explored. N applications were designed at 6 levels( 0,24,48,72,96,120 kg hm-2 a-1,respectively). The results showed that:(1)Along with the gradient of N supply,soil SOC,TN,TP peaked at the F3 treatment. The highest values of SOC,TN,TP were 2. 50%,0. 22% and 0. 13%,respectively. The values of soil C/N significantly increased with the increasing N addition. However,the responses of soil N/P,C/P value to different N rates were contrast to those of SOC,TN,TP. The minimum values of soil N/P,C/P in F2 treatment were 0. 92,11. 01,respectively.(2)There were no significant effects of N supply on foliar C,N,P concentration. Foliar C,N concentration peaked at the rate of F3 treatment( 47. 89% and 1. 50%,respectively),and foliar P concentration peaked at the rate of F2 treatment( 0. 24%). There were also no remarkable effects of different N inputs on foliar C: N: P ecological stoichiometry.(3)Cluster analysis showed that the tree diagram was divided into three groups. It was reliable to regard the amount of F2 as the optimal N rate. Results from factors analysis indicated that soil C: N: P ecological stoichiometry,foliar C: N: P ecological stoichiometry was more sensitive to N addition.

关 键 词：N添加 墨西哥柏人工林 土壤碳氮磷生态化学计比 叶片碳氮磷生态化学计比 

分 类 号：S714[农业科学—林学]