干旱区生态环境知识资源中心(Arid): Impacts of irrigation on soil C and N stocks in grazed grasslands depends on aridity and irrigation duration

Arid

DOI	10.1016/j.geoderma.2021.115109
	Impacts of irrigation on soil C and N stocks in grazed grasslands depends on aridity and irrigation duration
	Mudge, Paul L.; Millar, Jamie; Pronger, Jack; Roulston, Alesha; Penny, Veronica; Fraser, Scott; Eger, Andre; Caspari, Thomas; Robertson, Balin; Mason, Norman W. H.; Schipper, Louis A.
通讯作者	Mudge, PL (corresponding author), Manaaki Whenua Landcare Res, Private Bag 3127, Hamilton 3240, New Zealand.
来源期刊	GEODERMA
ISSN	0016-7061
EISSN	1872-6259
出版年	2021
卷号	399
英文摘要	Irrigation has been used for millennia to increase the quantity and reliability of food and fibre production in areas where lack of precipitation limits plant growth. Despite the importance of irrigation, our understanding of the impact of irrigation on soil carbon (C) and nitrogen (N) stocks is still limited, particularly for grazed grasslands. In this study, we analysed soil profile C and N data collected to 0.6 m depth from 124 paired irrigated and unirrigated grassland sites across different regions and soils in New Zealand. Averaged across all sites, soil C and N stocks were significantly lower in irrigated than adjacent unirrigated soils. Cumulative differences increased with depth in the profile to a maximum at 0.5 m, where irrigated soils had 5.21 Mg ha(-1) less C (P < 0.001) and 0.3 Mg ha(-1) less N (P < 0.05). The C:N ratio was also consistently lower (P < 0.001) in irrigated soils. There was no evidence for an overall effect of soil order or region on the irrigation effect on C and N, but there was a significant negative relationship between the irrigation effect on soil C and aridity. There was no irrigation effect on soil C at the most arid sites, but as aridity decreased (precipitation >575 mm or aridity index >0.85) there were increasingly significant C losses from irrigated soils relative to adjacent unirrigated soils. There was evidence that the effect of irrigation increased with irrigation duration - from no significant effect at any depth for sites irrigated for <6-12 years, to a difference of 8.2 Mg C ha(-1) in the top 0.5 m for sites irrigated for more than 12 years. There was no compelling evidence for continued long-term loss of C, which suggests that a new equilibrium may be reached with soil C stocks 5-10 Mg ha(-1) lower under irrigated than unirrigated grasslands. Lower C stocks in irrigated than unirrigated soils do not agree with current IPCC recommended default values and this discrepancy needs to be addressed.
英文关键词	Soil carbon Soil nitrogen Pasture Soil organic matter Carbon sequestration
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000656902300009
WOS关键词	CARBON STORAGE ; NITROGEN ; LAND
WOS类目	Soil Science
WOS研究方向	Agriculture
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368442
作者单位	[Mudge, Paul L.; Pronger, Jack; Fraser, Scott; Mason, Norman W. H.] Manaaki Whenua Landcare Res, Private Bag 3127, Hamilton 3240, New Zealand; [Penny, Veronica; Eger, Andre; Caspari, Thomas; Robertson, Balin] Manaaki Whenua Landcare Res, POB 69040, Lincoln 7608, New Zealand; [Millar, Jamie; Roulston, Alesha; Schipper, Louis A.] Univ Waikato, Sch Sci, Private Bag 3105, Hamilton 3240, New Zealand; [Millar, Jamie; Roulston, Alesha; Schipper, Louis A.] Univ Waikato, Environm Res Inst, Private Bag 3105, Hamilton 3240, New Zealand
推荐引用方式 GB/T 7714	Mudge, Paul L.,Millar, Jamie,Pronger, Jack,et al. Impacts of irrigation on soil C and N stocks in grazed grasslands depends on aridity and irrigation duration[J],2021,399.
APA	Mudge, Paul L..,Millar, Jamie.,Pronger, Jack.,Roulston, Alesha.,Penny, Veronica.,...&Schipper, Louis A..(2021).Impacts of irrigation on soil C and N stocks in grazed grasslands depends on aridity and irrigation duration.GEODERMA,399.
MLA	Mudge, Paul L.,et al."Impacts of irrigation on soil C and N stocks in grazed grasslands depends on aridity and irrigation duration".GEODERMA 399(2021).