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江西吉安井冈蜜柚林土壤碳储量研究

Research on Soil Carbon Storage of Jinggang Honey Pomelo Forest in Ji’an

  • 摘要: 以江西吉安市井冈蜜柚林土壤固碳能力为例,研究了井冈蜜柚林土壤碳储量及分布规律。先对吉安5个地区的井冈蜜柚林土壤(土壤分级:0~10 cm,10~20 cm,20~30 cm)进行调查采样,随后进行室内测试分析得出有机碳含量,计算得出土壤各个层次的碳储量。研究结果:(1)随着土层深度的增加,各个样地土层的有机碳含量基本呈现出减少的趋势,不同样地土壤的有机碳含量减少的程度不同,土壤越深递减速度越慢,说明表层土壤有较强的固碳能力;同一土层不同样地之间的土壤有机碳含量存在较大差异。(2)0~10 cm土层的有机碳储量最高,说明表层土对土壤碳储量的贡献率最大,10~20 cm与20~30 cm的土壤碳储量差异不大。(3)吉水0~30 cm土层的土壤碳储量最高为35.17 t/hm2,低于江西省森林土壤0~20 cm土层的平均有机碳密度38.9 t/hm2,说明井冈蜜柚林土壤固碳能力偏弱。(4)按碳价格260.90元/t计算,试验样地的碳汇经济效益分别为7 451元/hm2、9 175元/hm2、3 130元/hm2、5 478元/hm2、6 265元/hm2,具有一定的碳汇经济价值。研究结果可为吉安市井冈蜜柚产业土壤固碳能力的提高提供参考,以实现经济和环保双丰收。

     

    Abstract: Taking the soil carbon sequestration ability of Jinggang honey pomelo forest in Ji’an city,Jiangxi Province as an example the soil carbon storage and distribution were studied.Firstly,the soil of Jinggang honey Pomelo forest in 5 areas of Ji’an was investi‐gated and sampled,and then the organic carbon content was obtained by laboratory test and analysis,and the carbon storage at each level of the soil was calculated.The results are as follows:First,with the increase of soil depth,the organic carbon content of soil lay‐er in each sample plot basically showed a decreasing trend.The degree of reduction of soil organic carbon content in different plots was different,and the deeper the soil was,the slower the decline rate was,indicating that the surface soil had a strong carbon seques‐tration ability.There are great differences in soil organic carbon content in different soil layers.Second,the organic carbon storage of0~10 cm soil layer was the highest,indicating that the contribution rate of topsoil to soil carbon storage was the largest,and there was little difference between soil carbon storage of 10~20 cm and 20~30 cm.Third,the highest carbon storage of 0~30 cm soil layer in Jishui was 35.17 t/hm~2,but it was still lower than the average organic carbon density of 0~20 cm soil layer in Jiangxi Province of38.9 t/hm~2,indicating that the carbon fixation capacity of soil in Jinggang honey pomelo forest was weak.Fourth,according to the da‐ta of the compilation group of China Biodiversity National Report,the carbon price is 260.90 yuan/t,and the economic benefits of carbon sink of Jinggang honey pomelo forest in this test plot are 7 451 yuan/hm~2,9 175 yuan/hm~2,3 130 yuan/hm~2,5 478 yuan/hm~2and 6 265 yuan/hm~2,respectively.It still has a certain economic value of carbon sink.The research results can provide reference for improving the soil carbon sequestration ability of Jinggang honey pomelo industry in Ji’an City,so as to achieve both economic and environmental protection harvest.

     

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