喀斯特峰丛洼地不同森林类型植物和土壤C、N、P化学计量特征  

Stoichiometric characteristics of plant and soil C,N and P in different forest types in depressions between karst hills,southwest China

作　　者：俞月凤[1,2,3] 彭晚霞[1,2] 宋同清[1,2] 曾馥平[1,2] 王克林[1,2] 文丽[1,2,3] 范夫静[1,2,4] 

机构地区：[1]中国科学院亚热带农业生态研究所亚热带农业生态过程重点实验室,长沙410125 [2]中国科学院环江喀斯特生态系统观测研究站,广西环江547100 [3]中国科学院大学,北京100049 [4]江西农业大学,南昌330045

出　　处：《应用生态学报》2014年第4期947-954,共8页Chinese Journal of Applied Ecology

基　　金：中国科学院西部行动计划项目(KZCX2-XB3-10);中国科学院战略性先导科技专项(XDA05070404;XDA05050205);"十二五"国家科技支撑计划项目(2011BAC09B02);国家自然科学基金项目(31370485;31370623;U1033004;31100329);广西特聘专家项目;广西科技项目(桂科攻1123001-9C)资助

摘　　要：研究西南喀斯特峰丛洼地人工林、次生林、原生林3个不同森林类型的6个代表性植物群落C、N、P化学计量特征及其与土壤的关系.结果表明:不同森林类型植物和土壤C、N、P含量均存在显著差异.土壤C和N含量均为次生林最高,人工林最低,土壤P含量为人工林最高,原生林最低;植物C和P含量变化趋势为人工林>原生林>次生林,植物N含量为次生林最高,原生林最低.土壤C∶P、N∶P以及植物C∶P均为原生林显著高于次生林和人工林,土壤C∶N在不同森林类型间差异不显著;植物N∶P为次生林最高,人工林最低,植物C∶N为原生林>人工林>次生林.在不同森林类型中,乔木叶片N含量与P含量、C∶N与C∶P以及C∶P与N∶P之间均呈显著线性正相关,除了植物叶片C∶N与N∶P以及土壤C∶N与N∶P之间呈显著线性负相关外,植物和土壤的C、N、P、C∶P均无显著相关性,说明土壤C、N、P供应量对乔木叶片C、N、P含量影响不大.The stoichiometric properties of plant carbon （C）, nitrogen （N） and phosphorus （P） and their relationships with soil were studied in six dominant plant communities in three forest types, i. e. , plantation forest, secondary forest and primary forest in depressions between karst hills, southwest China. The C, N and P contents of both plant and soil had significant differences among the different forest types. Soil C and N contents were the highest in the secondary forest and the lowest in the plantation forest. Soil P content was the highest in the plantation forest and the lowest in the primary forest. Plant C and P contents were in the order of plantation forest 〉 primary forest 〉 secondary forest, and plant N content was the highest in the plantation forest and the lowest in the primary forest. Soil N：P, C：P and plant C：P ratios were significantly higher in the primary forest than in the other two forest types. There were no significant difference for the soil C：N ratio among the three forest types. Plant N：P ratio was the highest in the secondary forest and the lowest in the plantation forest. Plant C ： N ratio was in the order of primary forest 〉 plantation forest 〉 sec- ondary forest. There were significantly positive linear correlations between N and P contents, C：N and C：P ratios, C：P and N：P ratios of arbor leaves in the different forest types, and significant negative linear correlations between plant C ： N and N ： P ratios, and between soil C ： N and N ： P ratios. There were no significant correlations between plant and soil C, N, P contents and C：P ratio, suggesting that the supply of C, N and P from soil had little influence on plant C, N and P contents.

关 键 词：化学计量 相关分析 森林类型 喀斯特峰丛洼地 

分 类 号：S718.5[农业科学—林学]