不同树龄咖啡叶片与土壤的C、N、P生态化学计量研究  

Eco-stoichiometric Characteristics of Soil and Leaves Carbon,Nitrogen and Phosphorus in Different Tree Ages of Coffee

作　　者：陈肖 崔现亮[1] 罗娅婷[1] 赵利坤[1] 李学玲[1] CHEN Xiao;CUI Xianliang;LUO Yating;ZHAO Likun;LI Xueling(Pu’er University,Pu’er,Yunnan 665000,China)

机构地区：[1]普洱学院,云南普洱665000

出　　处：《热带作物学报》2023年第9期1801-1809,共9页Chinese Journal of Tropical Crops

基　　金：云南省教育厅科学研究基金资助性项目(No.K2017052,No.2021J0521);云南省大学生创新创业训练计划项目(No.Y000057-45)。

摘　　要：为了解不同树龄咖啡C、N、P生态化学计量特征,以云南省普洱市思茅区南屏镇某咖啡庄园1、7、10、20 a四个树龄咖啡作为研究对象,测定咖啡叶片和土壤C、N、P含量及其化学计量比。结果表明:(1)咖啡叶片N、P含量与树龄呈正比,随树龄增加而逐渐增加,与C含量呈反比,随树龄增加逐渐减少;不同树龄咖啡N、P含量差异达到显著水平(P<0.05),化学计量比C∶N、C∶P均随树龄增长而降低,其中C∶P在不同树龄存在极显著差异(P<0.01),叶片N∶P阈值分析发现,叶片N∶P比在4个树龄均小于14,说明咖啡的生长主要受N元素限制。(2)不同树龄土壤SOC含量存在显著差异(P<0.05),7a的咖啡C、N、P含量均为最高;0~10cm土层C、N、P含量均值略高于10~30 cm土层,0~10 cm土层C∶N均值9.79高于10~30 cm土层的6.87;0~10 cm土层咖啡C∶P变化范围为11.51~46.80,10~30 cm土层的为4.53~20.82,土层间差异较大;不同土层N∶P变化范围分别是1.00~5.12、0.81~2.08,相关性表明N∶P和P元素有显著相关性,P元素是造成C∶N变化的主要原因(。3)从相关性分析来看,咖啡叶片C与N、P呈显著负相关(P<0.05);叶片N与C∶N、C∶P均有极显著正相关关系(P<0.01),叶片P与C∶P呈极显著负相关(P<0.01),不同土层SOC和全N均呈正相关(P<0.05),叶片的C、N、P与土壤的SOC、TN无相关性,计量比也存在极少的相关性。因此,咖啡土壤SOC、TN和TP较低,主要受N养分的限制,咖啡叶片N、P吸收具有协同效应,且叶片和土壤元素存在广泛的计量耦合关系。In order to understand the C,N and P eco-chemometric characteristics of different tree age groups,the coffee from the Manxieba Xiaoaozi Nanpingzhen a Coffee Estate in Pu'er Simao District was studied in four tree age groups:1 a,7 a,10 a and 20 a,the C,N,and P levels in coffee leaves and soil were determined,as well as the chemometric ratio between them.The N and P content of coffee leaves was proportional to the age of the tree,gradually increasing with the age of the tree,inversely proportional to the C content,gradually decreasing with the age of the tree.The differences in N and P content of coffee reached significant levels(P<0.05),and the chemometric ratios C∶N and C∶P decreased with tree age,among which C∶P was significantly different in different tree ages(P<0.01).Leaf N∶P threshold analysis found that the leaf N∶P ratio was less than 14 in all four tree age segments,indicating that the growth of coffee was mainly limited by N elements.There was significant variability(P<0.05)in SOC content between tree age groups,with 7 a coffee having the highest C,N and P content.The mean values of C,N and P content were slightly higher for 0-10 cm soils than for 10-30 cm soils and 9.79 for 0-10 cm soils than 6.87 for 10-30 cm soils.The range of C∶P variation for coffee was 11.51‒46.80 for 0‒10 cm soils and 4.53‒20.82 for 10‒30 cm soils, with large inter-soil variations. The range of N∶P variation was 1.00‒5.12 and 0.81‒2.08 for different soil layers, respectively. The correlation showed that N∶P and P elements were significantly correlated and P element was the main cause of C∶N variation. From the correlation analysis, coffee leaf C was significantly negatively correlated with N, P (P<0.05), leaf N was extremely significantly positively correlated with C∶N, C∶P (P<0.01) and leaf P was extremely significantly negatively correlated with C∶P (P<0.01). The SOC and TN of different soil layers were positively correlated (P<0.05), and the C, N, and P of the blade were not correlated with t

关 键 词：生态化学计量学 咖啡 叶片 土壤 树龄 

分 类 号：S571.2[农业科学—作物学]