首页|玛纳斯河流域绿洲棉田土壤有机碳和全氮含量及碳储量变化分析

玛纳斯河流域绿洲棉田土壤有机碳和全氮含量及碳储量变化分析

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[目的]为了对绿洲棉田土壤有机碳、全氮的分布状况进行研究.[方法]以天山北坡玛纳斯河流域绿洲棉田为研究区,以弃耕地为对照,采用地统计学方法,研究连续23年种植棉花地的土壤0~30、30 ~60和60 ~ 100 cm土层土壤有机碳和全氮的分布特征.[结果]玛纳斯河流域绿洲棉田土壤有机碳、全氮含量呈垂直分布,且随着土壤深度的增加而降低,并且0 ~ 30cm土层明显高于30 cm以下土层,土壤有机碳储量呈现增加的趋势;弃耕地土壤有机碳、全氮亦呈垂直分布,且随着土壤深度的增加而含量降低,有机碳含量差异明显,并且弃耕地土壤有机碳含量呈逐月下降趋势,而棉田土壤有机碳储量变化呈先减少后增加,即棉花生长初期,0 ~30和30 ~ 100cm土层有机碳储量降低,到花期最低;而随着棉花进入生殖生长后期,有机碳储量呈现增加趋势;弃耕地有机碳储量因没有植株凋落物的输入而呈现逐月降低的趋势,二者有机碳含量差异明显.[结论]绿洲棉田土壤有机碳、全氮含量明显高于弃耕地,土壤有机碳储量呈现增加的趋势,且主要发生在0~30 cm土层,在30~100 cm土层中有机碳、全氮含量变化差异不大.
Change Analysis of Cotton Soil Organic Carbon and Total Nitrogen and Carbon Storage in Manas River Valley
[Objective] The research aimed to study soil organic carbon and total nitrogen distribution in Oasis Cotton.[Method] Tianshan Mountains in Manas River Valley cotton fields as a research area,abandoned farmland as a control,with geographic methods,the distribution characteristics of cotton soil organic carbon and total nitrogen content in Manas River Valley cotton fields in last 23 years were investigated.[Result] Cotton soil organic carbon and total nitrogen content in Manas River Valley decreased with the increase of soil depth,and those in 0-30 cm soil layer were significantly higher than those in 30 cm below the soil.Organic carbon storage tended to increase.Soil organic carbon and total nitrogen in abandoned farmland in vertical distribution was also found,and with the increase of soil depth,decreased significantly,and soil organic carbon content in abandoned farmland showed a decrease trend month by month.However,cotton soil organic carbon storage firstly decreased and then increased in the case.Namely,in the early growth of cotton,0-30 cm and 30-100 cm soil organic carbon decreased to the lowest in the bloom stage.And with the reproductive growth of cotton into the later stages,organic carbon showed an increasing trend,abandoned farmland soil organic carbon storage showed a decreasing trend monthly because there was no input of plant litter.There were significant differences between two organic carbon contents.[Conclusion] Oasis cotton soil organic carbon content and total nitrogen content were significantly higher than those in abandoned farmland,soil organic carbon storage tended to increase,and occurred mainly in 0-30 cm.However,at 30-100 cm soil organic carbon,total nitrogen content change were insignificant.

Oasis cottonSoil organic carbonSoil nitrogenSoil organic carbon storage

雷军、雷子莹、林海荣、赵瑞海

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新疆生产建设兵团绿洲生态农业重点实验室,新疆石河子832003

桂林理工大学地球科学学院,广西桂林541006

绿洲棉田 土壤有机碳 土壤全氮 土壤有机碳储量

31160115,31360320

2013

安徽农业科学
安徽省农业科学院

安徽农业科学

影响因子:0.413
ISSN:0517-6611
年,卷(期):2013.(28)
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