种植年限对胶园土壤剖面有机碳分布特征的影响  

The Vertical Characteristics of Soil Organic Carbon in Different Developing Stages of Rubber Tree(Hevea brasiliensis)Plantations

作　　者：王春燕[1,2] 林希昊[3] 李光明[1,2] 陈秋波[1] 杨礼富[1] 王真辉[1] 

机构地区：[1]中国热带农业科学院橡胶研究所,农业部橡胶树生物学重点开放实验室,海南儋州571737 [2]海南大学环境与植物保护学院,海南儋州571737 [3]中国热带农业科学院湛江实验站,广东湛江524013

出　　处：《热带作物学报》2011年第8期1399-1403,共5页Chinese Journal of Tropical Crops

基　　金：中央级公益性科研院所基本科研业务费专项资金橡胶研究所资助项目(No.XJSYWFZX2008-18、XJSYWFZX2009-30)

摘　　要：通过剖面直接实测法．研究幼树期（4a）、旺产期（12a和19a）3种不同树龄橡胶林土壤有机碳变化特征及其与土壤DH、全氮、C／N比的相关关系。结果表明：（1）4、12、19a橡胶林土壤有机碳含量均随着土层深度的增加而降低：3个树龄橡胶林土壤有机碳总体大小顺序为12a〉4a〉19a。（2）橡胶林土壤呈酸性反应，且土壤剖面有机碳含量均随深度呈下降趋势，而土壤pH随深度呈上升趋势。土壤不同层次有机碳含量与pH呈显著负相关（R^2≥0．7088）。（3）不同树龄橡胶林土壤有机碳与全氮之间均呈显著的线性正相关，土壤C／N比为8．19～16．49．有利于有机质矿化过程中养分的释放。橡胶林土壤C/N比随树龄的增长不断下降，说明树龄大小对土壤碳氮含量在土壤剖面垂直分布上有一定的影响。By means of the direct determination method in soil profiles, the variation characteristics of soil organic carbon （SOC）in different developing stages and its relationship with soil pH, soil C/N ratio and total nitrogen content of rubber（Hevea brasiliensis）plantations in 3 different ages, i.e., immature period （4 a）and peak yielding period （12 a, 19 a）were studied. The results obtained indicated that SOC contents of rubber plantations at 3 different ages increased with soil depth. Generally the order of SOC contents in rubber plantations was： 12 a 〉 4 a 〉 19 a. The content of SOC decreased with depth, whereas the value of soil pH increased with depth. SOC content in different layers had a significant negative relationship（R2~〉0.708 8）. There was positive linear correlation between SOC and STN of rubber plantations in different ages. Soil C/N ratio along the gradient was with in the range of 8.19- 16.49, being favorable to the nutrient release during organic matter decomposition. Soil C/N ratio of rubber plantation decreased with rubber tree age, which showed planting age affected soil C and N content in the vertical distribution.

关 键 词：橡胶树 土壤有机碳 相关关系 

分 类 号：S794.1[农业科学—林木遗传育种] Q948.113[农业科学—林学]