Grassland plant species and cultivar effects on nitrous oxide emissions after urine application

被引:19
|
作者
Bowatte, Saman [1 ,2 ]
Hoogendoorn, Coby J. [1 ,3 ]
Newton, Paul C. D. [1 ]
Liu, Yang [1 ,2 ]
Brock, Shona C. [1 ]
Theobald, Phillip W. [1 ]
机构
[1] AgRes Grasslands, Private Bag 11008, Palmerston North, New Zealand
[2] Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Grassland Agroecosyst, Lanzhou, Gansu, Peoples R China
[3] Manaaki Whenua Res, Private Bag 11,052, Palmerston North, New Zealand
关键词
Mitigation; Nitrogen; Ryegrass; Legumes; BIOLOGICAL NITRIFICATION INHIBITION; GRAZED PASTURE; BRACHIARIA-HUMIDICOLA; CLOVER PASTURE; AFFECTED AREAS; N2O EMISSIONS; ANIMAL URINE; SOIL; AGRICULTURE; DIVERSITY;
D O I
10.1016/j.geoderma.2018.03.001
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
We tested whether plant species identity influenced emissions of nitrous oxide (N2O) in response to the addition of urine at a rate of 530 kg nitrogen (N) ha(-1). The plants tested are all used in temperate pastoral agriculture and comprised 11 C-3 grasses, 3 forbs and 2 legumes with controls of bare ground and a standard ryegrass/white clover mixture used in the region. Total N2O emitted over 6 weeks after the application of cattle urine was highest in the bare ground. Plant identity was important with emissions ranging from an average of 0.67 kg N2O-N ha(-1) for the Italian ryegrass Grasslands Moata (Lolium multiflorum) to 3.20 kg N2O-N ha(-1) for the upland brome Grasslands Gala (Bromus stamineus). The 4 perennial ryegrass (Lolium perenne) cultivars had generally low emissions (average of 1.02 kg N2O-N ha(-1)) and the white clover (Trifolium repens) cultivars high emissions (average of 2.86 kg N2O-N ha(-1)). Plants with high N uptake rates had low N2O emissions. However, this was not always due to a high N uptake rate per se as during the first 2 weeks after urine was applied, when N2O emissions were at their highest, soil mineral N was in excess of plant N demand, It seems that some traits related to a high plant N uptake, such as low soil nitrification potential, might be important in driving differences in emissions associated with different plant species.
引用
收藏
页码:74 / 82
页数:9
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