黄土高原千阳人工侧柏林有机碳的研究  

Study on organic carbon of Platycladus orientalis plantation in Qianyang loess plateau

作　　者：张玲玲[1] 苏印泉[1] 刘艳[1] 何德飞[1] 高海霞[1] 王建[2] 许喜明[1] 

机构地区：[1]西北农林科技大学林学院,陕西杨凌712100 [2]西北农林科技大学资环学院,陕西杨凌712100

出　　处：《中南林业科技大学学报》2013年第2期56-60,共5页Journal of Central South University of Forestry & Technology

基　　金：陕西省日元贷款项目(K332020023)

摘　　要：采取分级调查的方法对黄土高原侧柏人工林碳汇进行研究,对比侧柏不同林龄生态系统及邻近荒地生态系统碳汇情况,分析造林对当地碳储量影响。研究结果表明:幼龄林有机碳比例较大的部分,均在树体的末端部位,其后,逐渐向树干、三级根、三级枝中转移。侧柏的叶、果等碳氮比低,凋落后易于分解,且有机碳含量比例较大,有利于补充土壤有机碳库。侧柏林下土壤0～30 cm含碳量较高,与其下土层相比差异显著。造林前期,因人工整地造成水土流失,有机碳有降低趋势,但随着人工林的生长郁闭,土壤中的有机碳逐步增加,对土壤总碳库补充增加明显,改善了土壤有机碳储量。且随着地上部分的增长,人工林生态系统总体含碳量较荒地大为提升。通过拟合,得到侧柏生态系统有机碳密度与林龄的拟合方程:,拟合结果说明:随着林龄的增长侧柏人工林碳吸收呈上升趋势。The carbon sink of Platycladus orientalis plantation in loess plateau was investigated by using classified survey method,the P.orientalis ecological system was compared with the neighboring barren land ecological system and the effects of forest cultivation and management on local carbon storage.The results show that organic carbon of the young forest mainly distributed in the end parts of the trees,then gradually transferred to trunk,third-order root,and third-order branches;the carbon-nitrogen ratio of leaves,fruits were low,which were easy to decompose after withered,and had a greater proportion of organic carbon content,thus this is in favor of adding soil organic carbon pool;the carbon content in 0~30 cm soil layer under the forest was higher,and the differences were significant with the soil of 30~80 cm;in first 8 years of the forestation,the soil and water loss generated by artificial land preparation resulted in reduction of organic carbon absorption,but with the growth of the plantation,the absorption of organic carbon increased and obviously improved the soil organic carbon storage.And with the growth of plantation aboveground part,the total carbon content of the plantation ecology system upgraded substantially and greatly than that wasteland.By fitting,the equation of ecological plantation system about organic carbon density and ages was set up.The fitting results show that the organic carbon absorption of the plantation in the loess plateau will take an upward trend.

关 键 词：黄土高原 侧柏人工林 有机碳 分级调查 

分 类 号：S791.38[农业科学—林木遗传育种]