杉木林土壤有机碳含量与土壤理化性质的相关性分析

Contents of Soil Organic Carbon and Its Relations with Soil Physicochemical Properties in Chinese Fir plantations

对湖南省平江县福寿林场3个龄组杉木林土壤有机碳含量变化特征及其与土壤理化性质的相关性进行了研究。结果表明：3个龄组杉木林的土壤有机碳含量都呈现出了随土层深度增加而减少的规律。0-15cm土层有机碳的含量分别是15-30cm,30-45cm,45-60cm土层有机碳含量的1.6-3.9倍,2.4-4.6倍,2.7-6.5倍。在0-45cm土层内,随着杉木林的生长发育,土壤有机碳含量呈现出了幼龄林较高,中龄林最低,成熟林最高的变化特征。土壤有机碳与全氮之间有极显著的正相关性,与土壤C/N和全磷存在显著的正相关性,与土壤容重存在显著的负相关性,与土壤全钾和p H值相关性不显著。

A study was made to investigate the contents of soil organic carbon（SOC） and its relations with soil physic-chemical properties in three age-group Chinese fir plantations in Fushou Forest Farm of Hunan Province. Results showed that the contents of SOC declined with the increase of soil depths in the soil of three forests. The contents of SOC in 0 - 15 cm soil layer was from 1. 6 to 3. 9 times as much as those in15 - 30 cm,from 2. 4 to 4. 6 times as much as those in 30 - 45 cm and from 2. 7 to 6. 5times as much as those in 45 - 60 cm,respectively. In 0 - 45 cm soil layer,with the increasing age of Chinese fir plantations,changes of SOC contents varied in the order of mature juvenile middle aged forests in 0 - 45 cm soil layer. A very significant positive correlation was found between soil SOC contents and the contents of total nitrogen,the contents of total phosphorous and C / N ratio showed significant positive correlations with soil SOC contents,while soil bulk density had a significant negative correlation with soil SOC contents. But the contents of soil total potassium and soil p H value had no significant correlations with soil SOC contents.