干旱区生态环境知识资源中心(Arid): 不同年限旱砂田土壤团聚体及其有机碳分布特征

Arid

	不同年限旱砂田土壤团聚体及其有机碳分布特征
其他题名	Distribution characteristics of soil aggregates and their associated organic carbon in gravelmulched land with different cultivation years
	杜少平 1; 马忠明 2; 薛亮 3
来源期刊	应用生态学报
ISSN	1001-9332
出版年	2017
卷号	28 期号:5 页码:1619-1625
中文摘要	以长期定位试验5、10、15、20、30年旱砂田为研究对象,研究了不同年限旱砂田土壤团聚体及其有机碳的分布特征.结果表明: 旱砂田土壤团聚体含量随粒级减小表现出降-升-降的变化趋势,10年以内旱砂田以> 5 mm粒级团聚体为主,15年以上旱砂田以0.05 ~ 0.25 mm粒级团聚体为主,>0.25 mm团聚体含量(R_(0.25))和团聚体平均质量直径(MWD)均随着覆砂年限的延长而减小.不同年限旱砂田土壤团聚体有机碳含量随团聚体粒级减小而增加,各粒级土壤团聚体有机碳含量、团聚体对有机碳的贡献率及团聚体有机碳储量均随着覆砂年限的延长和土层的加深而降低,>1 mm粒级团聚体有机碳对长期旱砂田有机碳变化响应敏感.10、15、20、30年较5年旱砂田团聚体有机碳储量在0 ~ 10 cm土层分别降低了8.0%、 24.4%、27.5%和31.4%,10 ~ 20 cm土层分别降低了1.4%、15.8%、19.4%和21.8%.综上所述,旱砂田土壤固碳能力随种植年限延长而降低,需加强15年以上旱砂田的土壤培肥工作.
英文摘要	The distribution characteristics of soil aggregates and their organic carbon in gravelmulched land with different planting years (5,10,15,20 and 30 years) were studied based on a long-term field trial. The results showed that the soil aggregate fraction showed a fluctuation (downup- down) trend with the decrease of soil aggregate size. The soil aggregates were distributed mainly in the size of >5 mm for less than 10 years cultivation,and 0.05-0.25 mm for more than 15 years. The content of aggregates over 0.25 mm (R_(0.25)) and the mean weight diameter (MWD) of soil aggregates all decreased with the increase of cultivation time. The content of organic carbon within soil aggregates increased with the decrease of soil aggregate size in gravel-mulched land with different planting years. However,the content of organic carbon within soil aggregates,contribution rates of different aggregate fractions to soil organic carbon and soil organic carbon storage of aggregate fractions decreased with planting time extension and soil depth. Soil organic carbon in the aggregate sizes over 1 mm was sensitive to long term gravel-mulched field planting. Organic carbon storage of aggregate fractions with 10,15,20 and 30 years of planting decreased by 8.0%,24.4%,27.5% and 31.4% in the soil depth of 0-10 cm,and 1.4%,15.8%,19.4% and 21.8% in the soil depth of 10-20 cm,respectively. In conclusion,the ability of soil carbon sequestration in arid gravelmulched field was reduced with planting time extension. Therefore,soil fertility of gravel-mulched fields which were cultivated for more than 15 years need to be improved.
中文关键词	旱砂田 ; 土壤团聚体 ; 有机碳 ; 有机碳储量
英文关键词	gravel-mulched field soil aggregate soil organic carbon soil organic carbon stock
语种	中文
国家	中国
收录类别	CSCD
WOS类目	BIOLOGY
WOS研究方向	Life Sciences & Biomedicine - Other Topics
CSCD记录号	CSCD:5992685
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236906
作者单位	1.甘肃省农业科学院蔬菜研究所, 兰州, 甘肃 730070, 中国; 2.甘肃省农业科学院, 兰州, 甘肃 730070, 中国; 3.甘肃省农业科学院土壤肥料与节水农业研究所, 兰州, 甘肃 730070, 中国
推荐引用方式 GB/T 7714	杜少平,马忠明,薛亮. 不同年限旱砂田土壤团聚体及其有机碳分布特征[J],2017,28(5):1619-1625.
APA	杜少平,马忠明,&薛亮.(2017).不同年限旱砂田土壤团聚体及其有机碳分布特征.应用生态学报,28(5),1619-1625.
MLA	杜少平,et al."不同年限旱砂田土壤团聚体及其有机碳分布特征".应用生态学报 28.5(2017):1619-1625.