摘要
森林生态系统土壤有机碳的储量及时空变化是制定森林生态系统可持续经营管理措施的重要依据,对全球碳循环与碳平衡的研究具有十分重要的理论价值。以华北土石山区不同密度油松和元宝枫人工林为研究对象,对不同林地类型的土壤密度、p H值以及全氮、速效钾、有机碳的质量分数等参数进行测定,对比分析不同林地类型土壤有机碳的质量分数、土壤有机碳密度、储量及垂直分布特征,探讨土壤有机碳质量分数与土壤理化性状的相关关系。结果表明：元宝枫林的平均土壤有机碳质量分数和有机碳密度均大于油松林的;土壤有机碳质量分数和有机碳密度在土壤表层（0~10 cm）为最高值并随土壤深度的增加而降低;土壤有机碳质量分数表现为2种林分密度下的元宝枫林无显著差异,而有机碳密度则表现为高密度元宝枫林〉低密度元宝枫林;在油松林中土壤有机碳质量分数、有机碳密度均表现为中密度油松林〉高密度油松林和低密度油松林。油松林和元宝枫林土壤有机碳质量分数与土壤密度均呈显著负相关,而全氮、速效钾与其呈显著正相关,油松林土壤有机碳质量分数与p H值呈显著相关,而元宝枫林土壤有机碳质量分数与p H值不相关。综上所述,华北土石山区元宝枫林较油松林具有更大的固碳潜力,而且土壤的有机碳质量分数及有机碳密度受树种和林分密度影响较大。
[ Background ] The soil organic carbon storage and its temporal and spatial variation in forest ecosystem are not only of significance for global carbon cycle and carbon balance study, but also the crucial for developing sustainable forest management measures. To comprehensively understand the characteristics of soil organic carbon （SOC） and accurately assess the soil carbon stock of the plantations, and therefore, provide evidence for plantation management in this region, This study was carried on the Pinus tabuliformis and Acer truncatum plantations of different stand density in rocky mountainous area of northern China. [ Methods] We examined the SOC content, SOC density and SOC storage and their vertical distribution between 0 - 100 cm soil depth of P. tabuliformis and A. truncatum two plantations with different stand densities in the rocky mountainous region of northern China and also discussed the correlations of SOC content and soil physicochemical properties, i. e. , soil density, pH, total nitrogen, and available potassium. [ Results] The results showed that the average SOC content and SOC density of A. truncatum plantations were both higher than these of P. tabuliformis plantations, indicating that under the similar climate and soil condition, the soil of A. truncatum plantations had greater carbon sequestration than the P. tabuliformis plantations. Meanwhile, the quantity of humus and plant roots in soil layers decreased with the increase of soil depth, both the SOC content and SOC density in 0 - 10 cm layer were the highest among the 0 - 100 cm soil depth and decreased with the increase of soil depth. The SOC content of the A. truncatum plantations showed no difference between the high and low stand densities, while the SOC density of the A. truncatum plantations in high density was greater than lower ones. However, both of the SOC content and SOC density of the P. tabuliformis plantations in the middle density was much higher than that in the high and low density ones. Specifically, the SOC density was the highest, when the stand density was 1 700 and 2 350 stems per hm^2 for the P. tabuliformis plantations and the A. truncatum plantations, respectively. The SOC content of the P. tabuliformis and A. truncatum plantations showed significant negative correlation with soil density, while highly positive correlation with the total nitrogen and available potassium. Nevertheless, only the SOC content of the P. tabuliformis plantations was affected by soil pH value. [ Conclusions] In this study the SOC content had the most significant relation with the soil total nitrogen among all the measured soil physicochemical properties in both of the P. tabuliformis and A. truncatum plantations. In summary, the A. truncatum plantations had greater potential for carbon sequestration than the P. tabuliformis plantations in rocky mountainous area of northern China, both SOC content and SOC density were greatly influenced by tree species and stand density.
出处
《中国水土保持科学》
CSCD
北大核心
2016年第1期97-105,共9页
Science of Soil and Water Conservation
基金
林业公益性行业科研专项"森林经营对生态系统碳水耦合变化的影响机理研究"(201204102)
关键词
土壤有机碳
碳密度
油松林
元宝枫林
华北土石山区
soil organic carbon
carbon density
Pinus tabuliformis plantation
Acer truncatum plantation
rocky mountainous area of northern China
