接种蚯蚓对土壤团聚体分布、稳定性及有机碳赋存的影响

被引:57
作者
于建光 [1 ,2 ]
胡锋 [1 ]
李辉信 [1 ]
王前进 [1 ]
王同 [1 ]
机构
[1] 南京农业大学资源与环境科学学院
[2] 江苏省农业科学院农业资源与环境研究所
关键词
植物残体; 土壤团聚体; 稳定性; 蚯蚓; 土壤有机碳;
D O I
暂无
中图分类号
S157 [水土保持];
学科分类号
090301 [土壤学];
摘要
通过一个月的室内培养试验,研究在不同土壤与植物残体施用下接种蚯蚓对土壤团聚体分布、稳定性及土壤有机碳的影响。供试土壤为粘粒含量较低的潮土(86 g/kg)与粘粒含量较高的红壤(318 g/kg),试验前受试土壤的大团聚体全部人为破坏;供试植物残体为高碳氮比的玉米秸秆与低碳氮比的三叶草残体;供试蚯蚓为威廉腔环蚓(Metaphire guillelmi)。试验结果表明:不同土壤与植物残体施用下,蚯蚓对土壤水稳性团聚体分布、微团聚体分散性及土壤有机碳赋存的作用不同,潮土中施用两种植物残体时,接种蚯蚓均显著降低土壤粘粒分散率(P<0.05),但不对水稳性团聚体分布及团聚体平均重量直径(MWD)产生影响,同时赋存于粘粉粒中的有机碳含量均增加;红壤中施用两种植物残体时,接种蚯蚓均显著降低土壤粘粒及粘粉粒分散率(P<0.05),同时均形成>2 mm大团聚体,2~0.25 mm大团聚体所占比例及MWD也显著增加(P<0.05),相应赋存于>2 mm大团聚体与2~0.25 mm大团聚体中的土壤有机碳含量均显著增加(P<0.05)。两种土壤在施用植物残体且接种蚯蚓时均可显著增加土壤有机碳的含量(P<0.05)。对于水土流失和土壤结构严重退化的地区,通过施用植物残体并接种蚯蚓是恢复土壤结构与增加土壤有机碳储存的重要生态工程措施。
引用
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页码:175 / 179+184 +184
页数:6
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