Three approaches to define desired soil organic matter contents

被引:37
|
作者
Sparling, G
Parfitt, RL
Hewitt, AE
Schipper, LA
机构
[1] Landcare Res, Hamilton, New Zealand
[2] Landcare Res, Palmerston North, New Zealand
[3] Landcare Res, Lincoln, New Zealand
关键词
D O I
10.2134/jeq2003.0760
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Soil organic C is often suggested as an indicator of soil quality, but desirable targets are rarely specified. We tested three approaches to define maximum and lowest desirable soil C contents for four New Zealand soil orders. Approach I used the New Zealand National Soils Database (NSD). The maximum C content was defined as the median value of long-term pastures, and the lower quartile defined the lowest desirable soil C content. Approach 2 used the CENTURY model to predict maximum C contents of long-term pasture. Lowest desirable content was defined by the level that still allowed recovery to 80% of the maximum C content over 25 yr. Approach 3 used an expert panel to define desirable C contents based on production and environmental criteria. Median C contents (0-20 cm) for the Recent, Granular, Melanic, and Allophanic orders were 72,88,98,132 Mg ha(-1), and similar to contents predicted by the CENTURY model (78, 93, 102, and 134 Mg ha(-1), respectively). Lower quartile values (54, 78, 73, and 103 Mg ha(-1), respectively) were similar to the lowest desirable C contents calculated by CENTURY (55,54,67, and 104 Mg ha(-1), respectively). Expert opinion was that C contents could be depleted below these values with tolerable effects on production but less so for the environment. The CENTURY model is our preferred approach for setting soil organic C targets, but the model needs calibrating for other soils and land uses. The statistical and expert opinion approaches are less defensible in setting lower limits for desirable C contents.
引用
收藏
页码:760 / 766
页数:7
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