贵州省喀斯特地区4种典型人工林叶片化学计量特征  

Leaf C, N, and P stoichiometry for four typical artificial forests in the karst region of Guizhou Province

作　　者：吕文强[1] 周传艳[1,2] 闫俊华[3] 李世杰 

机构地区：[1]贵州省科学院山地资源研究所,贵州贵阳550001 [2]华南理工大学环境与能源学院,广东广州510640 [3]中国科学院华南植物园,广东广州510650 [4]贵州省林业调查规划院,贵州贵阳550001

出　　处：《浙江农林大学学报》2016年第6期984-990,共7页Journal of Zhejiang A&F University

基　　金：国家自然科学基金资助项目(31360123);国家自然科学基金创新群体项目(40721002);中国科学院战略性先导科技专项(XDA05050205);中国科学院知识创新工程方向性项目(kzcx2-yw-306);贵州省科技基金资助项目(黔科合J字〔2008〕2014;黔科合J字〔2014〕2114);贵州科学院青年基金项目(黔科院J合字〔2013〕03);2011西部之光人才资金资助项目

摘　　要：为评价贵州省人工林生境养分供应状况及养分获取效率,以贵州省喀斯特地区4种典型人工林:华山松Pinus armandii林,杉木Cunninghamia lanceolata林,马尾松Pinus massoniana林和柏木Cupressus funebris林为研究对象,分析了以上4种人工林叶片生态化学计量学特征。结果显示:华山松、杉木、马尾松和柏木等4种典型人工林叶片碳(C)质量分数较高,氮(N)和磷(P)质量分数较低;各林型之间叶片碳质量分数变异较小,氮、磷质量分数以及碳氮比(C∶N),氮磷比(N∶P),碳磷比(C∶P)变异较大。4种典型人工林各林型之间叶片生态计量学指标大部分差异不显著(P>0.05)。4种典型人工林叶片碳氮比(C∶N)和碳磷比(C∶P)较大,表明它们从生境中获取养分的效率较高,而氮磷比(N∶P)则揭示了杉木林和华山松林的生长受氮限制、柏木林受磷限制,马尾松林受氮和磷的共同限制。To evaluate soil nutrient supply and nutrient use efficiency of artificial forests in the karst region of Guizhou Province, four typical artificial forests, namely Pinus armandii, Cunninghamia lanceolata, Cupressus funebris, and Pinus massoniana, were selected. Contents of C, N, and P in fresh leaves of the four selected artificial forests were analyzed using a variance analysis(ANOVA). Results showed that C content in leaves across the four artificial forests was relatively high, ranging from 555.453 to 628.125 mg·g-1. However, N content and P content of leaves were much lower than Toona sinensis and Zenia insignis in Guangxi Province.Furthermore, the variation coefficients of C content were very small variation in the four artificial forest types;whereas, variation coefficients of N and P contents, as well as the ratios of C ∶N, N ∶P, and C ∶P in leaves had greater range of variation. Statistical analysis revealed that most indexes of leaf ecological stoichiometric characteristics were not significantly correlated for each of the four artificial forests(P > 0.05). Compared to published data of natural karst forests, the higher C∶N and C∶P ratios in this study meant that the four selected artificial forests had higher effective nutrient utilization. Also, N∶P ratios of leaves in the four artificial forests revealed that 1) growth of Pinus armandii and Cupressus funebris was N-limiting, 2) growth of P. massoniana was P-limiting, and 3) growth of Cunninghamia lanceolata was both N-and P-limiting. Therefore, understanding leaf C, N, and P stoichiometry gleaned from this study would be crucial for developing reliable strategies and management of artificial forests in the karst region of Guizhou Province.

关 键 词：森林生态学 叶片 典型人工林 贵州省 生态化学计量学 喀斯特地区 

分 类 号：S718.5[农业科学—林学]