平潭4种主要防护林碳氮磷化学计量特征与碳氮储量研究  

The Stoichiometric Characteristics and Carbon,Nitrogen Stores of Four Main Coastal Shelterbelt Forests in Pingtan

作　　者：钟春柳 黄义雄[2] 张巧[1] 文华英 

机构地区：[1]福建师范大学地理科学学院,福建福州350007 [2]福建省亚热带资源与环境重点实验室,福建福州350007

出　　处：《西南林业大学学报（自然科学）》2016年第2期96-102,共7页Journal of Southwest Forestry University：Natural Sciences

基　　金：福建省水土保持林生态效应评价项目资助(HO0888)

摘　　要：对福建平潭岛4种主要防护林的植被、土壤碳氮磷含量、化学计量特征和碳氮储量进行分析。结果表明：4种主要防护林碳储量为黑松（189.20 t/hm2）〉台湾相思（162.02 t/hm2）〉湿地松（145.27 t/hm2）〉木麻黄（74.41 t/hm2）,氮储量台湾相思（13.13 t/hm2）〉黑松（9.90 t/hm2）〉木麻黄（5.05 t/hm2）〉湿地松（2.89 t/hm2）,其中碳氮储量呈现主干〉根〉枝〉叶的分布规律,树干是乔木层最主要的碳、氮库,分别占乔木层碳、氮储量的38.20%~57.39%和25.77%~51.00%;随着土壤厚度的加深,土壤碳、氮储量减少。土壤和植被碳氮储量之间均有极显著的正相关（P〈0.01）;土壤碳、氮储量与土壤N/P和C/P均具有极显著的线性正相关（P〈0.01）;植株碳储量与植株C/N、C/P,植株氮储量与植株N/P、C/P有极显著的线性正相关（P〈0.01）。碳氮磷化学计量特征对估测碳氮储量具有一定的指示意义,土壤C、N、P含量平均值分别为11.82、0.98、0.21mg/g,C/N、N/P、C/P平均值分别为10.78、4.21和50.66,平潭岛防护林普遍受氮、磷共同限制。The vegetation, soil carbon, nitrogen and phosphorus content, stoichiometric characteristics and carbon, nitrogen stores of four main coastal shelterbelt forests were analyzed in Pingtan. Results showed that carbon stores order in these four type of forests are Pinus thunbergii （ 189.20 t/hm2 ） 〉 Acacia confusa （ 162.02 t/hm2 ） 〉 Pinus elliottii （ 145.27 t/hm2 ） 〉 Casuarina equisetifolia （74.41 t/hm2 ） ; nitrogen stores order are Acacia confusa （ 13.13 t/hm2 ） 〉 Pinus thunbergii （9.90 t/hm2 ） 〉 Casuarina equisetifolia （ 5.05 t/hm2 ） 〉 Pinus elliottii （ 2.89 t/hm2 ）. Carbon and nitrogen stores order of different organs of arbor layer plants from high to low are trunk, root, branch and leaf. The trunk containing 38.20% -57.39% and 25.77% -51.00% total carbon, nitrogen stores in arbor layer plants, is the main carbon, nitrogen pool. The carbon, nitrogen stores of soil reduces gradually from topsoil to deeper soil profile. There are significantly positive correlation between plant and soil carbon, nitrogen stores （P 〈 0. 01 ） ; the carbon, nitrogen stores of soil positively correlated with soil N/P and C/P, and the carbon and nitrogen stores of plant positively correlated with plant C/N, C/P and N/P, C/P （P 〈 0. 01 ）. For this reason, the stoichiometric characteristics have guiding significance to estimate carbon and nitrogen stores. The mean contentof soil carbon, nitrogen and phosphorus are 11.82 rag/g,0.98 mg/g and 0.21 mg/g,respectively, and C/N, N/P and C/P ratio are 10. 78,4. 21 and 50. 66, respectively. Nitrogen and phosphorus are the limiting nutrients to coastal shelterbelt forests in Pingtan.

关 键 词：防护林 碳储量 氮储量 化学计量特征 平潭岛 

分 类 号：S718.55[农业科学—林学]