Sources of variability in the effectiveness of winter cover crops for mitigating N leaching

被引：59

作者：

Teixeira, Edmar I. ^{[1
]}

Johnstone, Paul ^{[1
]}

Chakwizira, Emmanuel ^{[1
]}

de Ruiter, John ^{[1
]}

Malcolm, Brendon ^{[1
]}

Shaw, Naomi ^{[1
]}

Zyskowski, Robert ^{[1
]}

Khaembah, Edith ^{[1
]}

Sharp, Joanna ^{[1
]}

Meenken, Esther ^{[1
]}

Fraser, Patricia ^{[1
]}

Thomas, Steve ^{[1
]}

Brown, Hamish ^{[1
]}

Curtin, Denis ^{[1
]}

机构：

[1] New Zealand Inst Plant & Food Res Ltd, Private Bag 4704, Christchurch, New Zealand

来源：

AGRICULTURE ECOSYSTEMS & ENVIRONMENT | 2016年 / 220卷

关键词：

APSIM; Cover crops; Modelling; Nitrate leaching; Crop rotation; Environmental assessment; NITROGEN CATCH CROPS; CROPPING SYSTEMS; NITRATE; MANAGEMENT; LOSSES; SOIL; CANTERBURY; CLIMATE; APSIM; YIELD;

D O I：

10.1016/j.agee.2016.01.019

中图分类号：

S [农业科学];

学科分类号：

09 ;

摘要：

The effectiveness of growing winter cover crops to mitigate nitrogen (N) leaching can be widely variable, even within a single climatic zone. We sought to investigate key drivers of this variability for the Canterbury Plains of New Zealand. First, through an analysis of local field experiments, we quantified the local variability in the effectiveness of cover crops to reduce N leaching. We then calibrated and applied a biophysical model to isolate the impact of potential drivers of this variability. Crop management (cover crop sowing date), soil water holding capacity (WHC) and inter-annual weather variability (30 years of historical climate) were selected as main factors to be investigated. The analysis of local literature showed that, compared to fallow treatments, winter cover crops reduced N leaching by an average (+/- 95% CI) of 17 +/- 8.2 kg N ha(-1). This represented a median N leaching reduction of similar to 50% with a wide interquartile range (6-75%). The modelling study showed that the delay in sowing dates consistently reduced the average effectiveness of cover crops, from >80% for March- to <25% for June-sown crops. For any "sowing date by soil WHC" scenario, there was also a large year to year variability. This was caused by the stochastic effect of inter-annual weather variability on the dynamics of crop N demand and soil N supply. For the conditions assumed in the modelling study, a sensitivity analysis of simulated results showed that sowing dates were the main contributor to total variability in the effectiveness of cover crops, followed by weather, factor interactions and soil WHC. These results suggest the need for caution when interpreting data from individual field trials due to the impact of inter-annual variability and interactions among multiple drivers on cover crop effectiveness. In addition, our analysis highlights the value of complementary methodologies, such as biophysical modelling, for extending the inference space of individual field studies. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：226 / 235

页数：10

共 51 条

[1]

Anastasiadis S., 2012, MITIGATION NUTR LOSS

[2]

[Anonymous], The Design and Analysis of Computer Experiments

[3] Nitrate leaching from organic arable crop rotations is mostly determined by autumn field management [J].

Askegaard, M. ;

Olesen, J. E. ;

Rasmussen, I. A. ;

Kristensen, K. .

AGRICULTURE ECOSYSTEMS & ENVIRONMENT, 2011, 142 (3-4) :149-160

[4]

Brown H, 2012, P 16 ANN AUSTR AGR C

[5] Nitrogen losses from the soil/plant system: a review [J].

Cameron, K. C. ;

Di, H. J. ;

Moir, J. L. .

ANNALS OF APPLIED BIOLOGY, 2013, 162 (02) :145-173

[6]

Carrick S., 2013, ACCURATE EFFICIENT U

[7] Effects of catch crops, no till and reduced nitrogen fertilization on nitrogen leaching and balance in three long-term experiments [J].

Constantin, J. ;

Mary, B. ;

Laurent, F. ;

Aubrion, G. ;

Fontaine, A. ;

Kerveillant, P. ;

Beaudoin, N. .

AGRICULTURE ECOSYSTEMS & ENVIRONMENT, 2010, 135 (04) :268-278

[8]

Core Team R, 2012, LANG ENV STAT COMP

[9] Biological and chemical assays to estimate nitrogen supplying power of soils with contrasting management histories [J].

Curtin, D ;

McCallum, FM .

AUSTRALIAN JOURNAL OF SOIL RESEARCH, 2004, 42 (07) :737-746

[10] Using winter cover crops to improve soil and water quality [J].

Dabney, SM ;

Delgado, JA ;

Reeves, DW .

COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS, 2001, 32 (7-8) :1221-1250

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