干旱区生态环境知识资源中心(Arid): Effects of different tillage and straw retention practices on soil aggregates and carbon and nitrogen sequestration in soils of the northwestern China

Arid

DOI	10.1007/s40333-019-0065-y
	Effects of different tillage and straw retention practices on soil aggregates and carbon and nitrogen sequestration in soils of the northwestern China
	Wu, Jun 1,2; Stephen, Yeboah 3; Cai, Liqun 1,2; Zhang, Renzhi 1,2; Qi, Peng 1; Luo, Zhuzhu 1,2; Li, Lingling 2,4; Xie, Junhong 2,4; Dong, Bo 1
通讯作者	Zhang, Renzhi
来源期刊	JOURNAL OF ARID LAND
ISSN	1674-6767
EISSN	2194-7783
出版年	2019
卷号	11 期号:4 页码:567-578
英文摘要	Soil tillage and straw retention in dryland areas may affect the soil aggregates and the distribution of total organic carbon. The aims of this study were to establish how different tillage and straw retention practices affect the soil aggregates and soil organic carbon (SOC) and total nitrogen (TN) contents in the aggregate fractions based on a long-term (approximately 15 years) field experiment in the semi-arid western Loess Plateau, northwestern China. The experiment included four soil treatments, i.e., conventional tillage with straw removed (T), conventional tillage with straw incorporated (TS), no tillage with straw removed (NT) and no tillage with straw retention (NTS), which were arranged in a complete randomized block design. The wet-sieving method was used to separate four size fractions of aggregates, namely, large macroaggregates (LA, >2000 mu m), small macroaggregates (SA, 250-2000 mu m), microaggregates (MA, 53-250 mu m), and silt and clay (SC, <53 mu m). Compared to the conventional tillage practices (including T and TS treatments), the percentages of the macroaggregate fractions (LA and SA) under the conservation tillage practices (including NT and NTS treatments) were increased by 41.2%-56.6%, with the NTS treatment having the greatest effect. For soil layers of 0-5, 5-10 and 10-30 cm, values of the mean weight diameter (MWD) under the TS and NTS treatments were 10.68%, 13.83% and 17.65%, respectively. They were 18.45%, 19.15% and 14.12% higher than those under the T treatment, respectively. The maximum contents of the aggregate-associated SOC and TN were detected in the SA fraction, with the greatest effect being observed for the NTS treatment. The SOC and TN contents were significantly higher under the NTS and TS treatments than under the T treatment. Also, the increases in SOC and TN levels were much higher in the straw-retention plots than in the straw-removed plots. The macroaggregates (including LA and SA fractions) were the major pools for SOC and TN, regardless of tillage practices, storing 3.25-6.81 g C/kg soil and 0.34-0.62 g N/kg soil. Based on the above results, we recommend the NTS treatment as the best option to boost soil aggregates and to reinforce carbon and nitrogen sequestration in soils in the semi-arid western Loess Plateau of northwestern China.
英文关键词	soil aggregates soil organic carbon total nitrogen straw management tillage practices Loess Plateau
类型	Article
语种	英语
国家	Peoples R China ; Ghana
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000484954700007
WOS关键词	ORGANIC-MATTER ; LOESS PLATEAU ; STABILITY ; MANAGEMENT ; FRACTIONS ; RAINFALL ; POOLS
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216795
作者单位	1.Gansu Agr Univ, Coll Resources & Environm Sci, Lanzhou 730000, Gansu, Peoples R China; 2.Gansu Agr Univ, Gansu Prov Key Lab Arid Iand Crop Sci, Lanzhou 730070, Gansu, Peoples R China; 3.Crops Res Inst, Kumasi 3785, Ghana; 4.Gansu Agr Univ, Coll Agron, Lanzhou 730070, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Wu, Jun,Stephen, Yeboah,Cai, Liqun,et al. Effects of different tillage and straw retention practices on soil aggregates and carbon and nitrogen sequestration in soils of the northwestern China[J],2019,11(4):567-578.
APA	Wu, Jun.,Stephen, Yeboah.,Cai, Liqun.,Zhang, Renzhi.,Qi, Peng.,...&Dong, Bo.(2019).Effects of different tillage and straw retention practices on soil aggregates and carbon and nitrogen sequestration in soils of the northwestern China.JOURNAL OF ARID LAND,11(4),567-578.
MLA	Wu, Jun,et al."Effects of different tillage and straw retention practices on soil aggregates and carbon and nitrogen sequestration in soils of the northwestern China".JOURNAL OF ARID LAND 11.4(2019):567-578.