干旱区生态环境知识资源中心(Arid): 民勤绿洲弃耕地土壤活性有机碳和氮变化特征及影响因素

Arid

	民勤绿洲弃耕地土壤活性有机碳和氮变化特征及影响因素
其他题名	Characteristics and influencing factors for soil active organic carbon and nitrogen in abandoned cultivated lands in Minqin oasis
	王军强 1; 施志国 2; 赵旭 2; 李彦荣 2
来源期刊	甘肃农业大学学报
ISSN	1003-4315
出版年	2016
卷号	51 期号:3 页码:21-30
中文摘要	【目的】了解民勤绿洲弃耕地不同土层土壤活性有机碳、氮演变特征.【方法】以民勤绿洲区不同年限弃耕地为研究对象,以常规耕地为参照,通过野外调查取样和室内测试分析,测定土壤微生物量碳(MBC)、微生物量氮(MBN)、颗粒有机碳(POC)、颗粒有机氮(PON)、易氧化碳(ROC)含量.【结果】弃耕后土壤活性有机碳、氮含量呈现明显的分层现象,短期弃耕(3 a)后0~20 cm土层土壤MBC、MBN、POC、PON和ROC分配比例高于常规耕地(0 a),并和其他弃耕地构成显著差异(P<0.05).20~40 cm土层,弃耕地土壤POC、PON和ROC分配比例和常规耕地差异不显著,但是MBC和MBN的分配比例和常规耕地差异显著(P<0.05).深层土壤氧化稳定系数(Kos)明显高于表层土壤,而且长期弃耕地Kos值显著高于常规耕地和短期弃耕地(3 a).【结论】弃耕有利于土壤活性有机碳、氮在0~20 cm土层中的形成和累积,而且该土层中活性有机质的分配比例也明显高于常规耕地,弃耕能提高土壤有机质的氧化稳定性,深层土壤表现的尤为突出.
英文摘要	【Objective】The aim of this study was to understand the changes of active organic carbon and nitrogen of different soil layers after arable land abandoned in Minqin oasis.【Method】Based on the field investigation and laboratory analysis,the content of soil microbial biomass carbon(MBC),microbial biomass nitrogen(MBN),particulate organic carbon(POC),particulate organic nitrogen(PON)and easily oxidized carbon(ROC)were measured in abandoned cultivated lands in different years taking cultivated land as control in the Minqin oasis,northwest China.【Result】MBC,MBN,POC,PONand ROCpresented significant stratification after cultivated land being abandoned.The distribution ratio of MBC,MBN,POC,PON and ROCat 0~20 cm soil depth were higher than that of cultivated land(0 a)after being abandoned short-term (3 a),and significantly differed from others(P<0.05).At 20~40 cm soil depth,the difference in the distribution ratio of POC,PON and ROC were not significantly between abandoned lands and cultivated land,but that of MBCand MBN differed significantly(P<0.05).The coefficient of oxidation stability(Kos)in deeper soil was significantly higher than that of surface and it was significantly higher in longterm-abandoned land than cultivated land and short-term-abandoned land(3 a).【Conclusion】Abandoned cultivation was in favor of formation and accumulation of active organic carbon and nitrogen at 0~20 cm depth,meanwhile could improve the distribution ratio of active organic carbon and nitrogen and increase organic matter oxidation stability and particularly obvious in deeper soil.
中文关键词	民勤绿洲 ; 弃耕地 ; 活性有机碳 ; 活性有机氮 ; 土壤
英文关键词	Minqin oasis abandoned cultivated land active organic carbon,active organic nitrogen soil
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:5754204
来源机构	中国科学院西北生态环境资源研究院
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234176
作者单位	1.中国科学院寒区旱区环境与工程研究所, 兰州, 甘肃 730000, 中国; 2.甘肃省农业工程技术研究院, 武威, 甘肃 733006, 中国
推荐引用方式 GB/T 7714	王军强,施志国,赵旭,等. 民勤绿洲弃耕地土壤活性有机碳和氮变化特征及影响因素[J]. 中国科学院西北生态环境资源研究院,2016,51(3):21-30.
APA	王军强,施志国,赵旭,&李彦荣.(2016).民勤绿洲弃耕地土壤活性有机碳和氮变化特征及影响因素.甘肃农业大学学报,51(3),21-30.
MLA	王军强,et al."民勤绿洲弃耕地土壤活性有机碳和氮变化特征及影响因素".甘肃农业大学学报 51.3(2016):21-30.