水土流失治理措施对小流域土壤有机碳和全氮的影响

被引：12

作者：

张彦军 ^{[1
]}

郭胜利 ^{[1
,2
]}

南雅芳 ^{[1
]}

李俊超 ^{[1
]}

机构：

[1] 西北农林科技大学资源环境学院

[2] 黄土高原土壤侵蚀与旱地农业国家重点实验室,中国科学院水利部水土保持研究所

来源：

生态学报 | 2012年 / 32卷 / 18期

关键词：

地貌类型; 治理措施; 土壤有机碳; 全氮; 土壤水分;

D O I：

暂无

中图分类号：

S157 [水土保持];

学科分类号：

0815 ; 082802 ; 090707 ; 0910 ;

摘要：

明确综合治理条件下小流域土壤有机碳(Soil organic carbon,SOC)和全氮(Total nitrogen,TN)的空间分布特征及其影响因素,对科学评价水土流失区土壤固碳潜力具有重要意义。以黄土高原丘陵沟壑区典型小流域(砖窑沟流域)为对象,基于流域内3种典型地貌类型(梁峁坡、沟坡、沟谷)和3种典型水土流失治理措施(水平梯田、林地和草地措施,坡耕地为对照),采集土壤样品737个,研究地貌类型和水土流失治理措施对小流域SOC和TN变化的影响。结果表明,同一地貌类型上,水平梯田、林地和草地措施的SOC和TN(0—10 cm土层)含量均显著高于坡耕地(P<0.1)。梁峁坡上,水平梯田、林地和草地措施条件下的SOC和TN含量较坡耕地依次提高了18%和24%、70%和59%、25%和21%;沟坡上,林地和草地措施的SOC和TN较坡耕地依次提高了76%和54%、25%和27%。同一治理措施在不同地貌类型间对0—10 cm土层SOC和TN的影响存在显著差异(P<0.1)。水平梯田条件下,沟谷的SOC和TN含量比峁坡提高了46%和43%;林地措施条件下,沟坡的SOC和TN含量比峁坡提高了18%和6%;草地措施条件下,沟坡的SOC和TN含量比峁坡提高了14%和18%。0—100 cm土层的SOC或TN在不同地貌类型或不同治理措施间的差异与土壤水分含量(Soil moisture,SM)的变化趋势基本一致,并且SOC或TN与SM呈指数关系y=aebx(y为SOC或TN,x为SM)。

引用

页码：5777 / 5785

页数：9

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