Quantification and Remediation of Soil Chemical Degradation in Tropical Australia, China and Thailand

文献类型： 外文期刊

第一作者： Noble, AD

作者： Noble, AD;Moody, P;Liu, GD;Ruaysoongnern, S;Qi, ZP;Berthelsen, S

作者机构：

关键词： degradation;land use;remediation;soil

期刊名称：PEDOSPHERE （ 影响因子：3.911； 五年影响因子：4.814 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Soil and land degradation in the tropics can be identified and described in terms of physical, chemical, and biological changes from its pristine state brought about by natural and anthropogenic influences. A characteristic of these ecosystems is their capacity to recycle nutrients through soil organic matter (SOM). Following disturbance through changed land management, SOM is rapidly mineralized and there is a corresponding decline in fertility and the variable charge component of the cation exchange capacity. As these ecosystems are strongly dependent on SOM for their functionality, changed land use can have irreversible impacts on the productivity of these systems. The paper focuses on quantifying chemical degradation through 'benchmarking' using data from paired sites in tropical China and Thailand using surface charge fingerprinting. Using values taken from the fingerprint of an undisturbed soil, an index of chemical degradation from 'ideality' was calculated. Various management strategies that attempt to reverse degradative trends or improve poor quality soils in their natural condition are discussed, such as the addition of natural clays and silicated materials. Results are present to show the effect of each of the aforementioned strategies on surface charge characteristics and associated increases in plant productivity.

分类号： S15

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