2.5代杉木种子园土壤有机碳垂直分布研究

以沙县官庄林场2.5代杉木种子园为研究对象，对土壤容重、有机碳含量及储量进行了研究。结果表明：0～100cm土层，2.5代杉木种子园高中低生产区平均容重为：1.29g·cm-3、1.44g·cm-3、1.58g·cm-3；3个生产区有机碳含量大小为：高生产区＆gt;中生产区＆gt;低生产区；3个生产区有机碳储量为：184.29t·hm-2、145.80t·hm-2、164.11t·hm-2，高生产区的有机碳含量远大于其他2个生产区，但中生产区的有机碳储量小于低生产区。综合分析表明，高生产区土壤状况优于中低生产区，合理种植杉木，增加杉木的产量，有利于土壤容重的减少及有机碳含量的增加，从而提高土壤肥力，达到增产的效果。

Soil Organic Carbon Vertical Distribution of the 2.5 Generation Seed Orchard of Cunninghamia lanceolata

This paper studies the soil bulk density,organic carbon content and organic carbon storage of the 2.5 generation of Chinese fir seed orchard in Guanzhuang state-owned forest farm in Shaxian county. The results show that,the average soil bulk density in the 0~100 cm soil layer of high、secondary、low pro-duction area in the 2.5 generation seed orchard of Cunninghamia lanceolata are 1.29g · cm-3,1.44g · cm-3, 1.58g · cm-3 respectively;Soil organic carbon content in three production area are positioned as follow：high production area＆gt;secondary production area＆gt;low production area;Organic carbon storage of three production area are 184.29t·hm-2,145.80t·hm-2,164.11t·hm-2 respectively,among which organic carbon content in high production area is much greater than the other two production area,while organic carbon storage in second-ary production area is less than the low production area. Comprehensive analysis shows the soil condition of the high production area is better than the other two production area. Plant Cunninghamia lanceolata rea-sonably to increase the production. It is conducive to decrease of the soil bulk density and increase of or-ganic carbon content so that soil fertility and the production can be improved.