豫东平原农林复合系统土壤有机碳时空特征  

Spatial and Temporal Distribution Characteristics of Soil Organic Carbon In the Agro-forestry Systems of Eastern Henan Plain

作　　者：万猛[1] 田大伦[1] 樊巍[2] 

机构地区：[1]中南林业科技大学生命科学与技术学院．湖南长沙410004 [2]河南省林业科学研究院,河南郑州450008

出　　处：《中南林业科技大学学报》2009年第2期1-5,17,共6页Journal of Central South University of Forestry & Technology

基　　金：国家“十一五”重大科技支撑项目专题(2006BAD03A0506);国家林业局行业公益专项

摘　　要：通过对3、9、13、17a农林间作和5、10、13a农田林网2种模式的农林复合系统不同层次土壤中有机碳的时空特征及其与土壤pH值、全氮的相关关系研究，结果表明：3、9、13和17a农林间作复合系统土壤各层的有机碳含量随着土壤深度的增加而逐渐下降，随着农林间作年限的增加而逐渐增长；0～20cm士层有机碳含量最高，为1．58～2．09g·kg-1，而40～60cm层的最低，为0．75～1．51g·kg-1；5、10和13a农田林网复合系统土壤有机碳含量与农林间作复合系统有相似的变化规律；3个林龄的农田林网复合系统不同层次有机碳含量的分异表现都为0～20cm土层（10．67～12．30g·kg-1）〉20～40cm土层（7．89～9．11g·kg-1）〉40～60cm土层（6．21～7．60g·kg-1）；2种农林复合系统土壤有机碳含量与土壤pH值存在一定的线性负相关，与土壤全氮之间存在显著的线性正相关。The paper investigated the distribution regularity of organic carbon contents in different soil layers of 3, 9, 13 and 17-year agro-forestry intercropping systems and 5, 10 and 15-year Farmland Shelterbelt Nets systems, and at the same time, analyzed the correlation among the characteristics of organic carbon, soil pH value and total N for a further study. The results demonstrate that in the vertical direction, the organic carbon content decreases as the soil depth increases and at the temporal scale, it increases as the number of year for intercropping practice of agro-forestry systems gets larger; that in she soil layer of 0～20 cm, it has its maximum value, ranging from 1.58 to 2.09 g · kg-1, while in the soil layer of 49～60 cm, it has its minimum value, ranging from 0. 75 to 1.51 g · kg-1; that its distribution in the Farmland Shelterbelt Nets systems has a similar regularity with that of the intercropping systems, and it presents a sequence as follows： 0～20 cm layer 〉 20～40 cm layer 〉 40～60 cm layer, ranging from 10.67 to 12.30, 7.89 to 9.11 and 6.21 to 7. 60 g · kg-1 respectively; and that there is a certain negative linear correlation between the soil pH value and the organic carbon content and also an obviously positive linear correlation between the content of soil total nitrogen and the organic carbon content, in both agro-forestry systems.

关 键 词：生态学 农林复合系统 土壤有机碳 时空特征 豫东平原 

分 类 号：S153.621[农业科学—土壤学]