VARIABILITY OF SOIL CHEMICAL PROPERTIES IN TWO UNCULTIVATED BROWN EARTHS
VARIABILITY OF SOIL CHEMICAL PROPERTIES IN TWO UNCULTIVATED BROWN EARTHS
复制标题
两种未开垦棕壤土壤化学性质的变异性
DOI：
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发表时间：
1968
期刊：
影响因子：
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通讯作者：
W. M. Williams
中科院分区：
文献类型：
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作者：
D. Ball;W. M. Williams
总结
在pH值，烧失量，可交换阳离子，可提取的磷酸盐，和土壤水分的变化，已被研究为0.15厘米的水平未开垦，未施肥的棕色地球在两个高地草原网站在北威尔士。结果表明，在所有采样地点，在半径为1米的圆上同时采集的样本存在很大程度的变异性。例如，在三个地点同一时间采集的22个样本中，可交换阳离子（钠除外）的变异系数平均为33%。这种空间变异性阻止了在22周的夏季采样期间检测到任何额外的季节性趋势。在任何土壤学或生态学研究中，必须考虑空间变异的重要性。
Summary
The variability in pH, loss-on-ignition, exchangeable cations, extractable phosphate, and soil moisture, has been studied for the 0.15 cm horizon of uncultivated, unfertilized Brown Earths at two upland grassland sites in North Wales. The results show that there is a high degree of variability in samples taken at the same time on circles of 1 m radius at all sampling locations. For example, coefficients of variation for exchangeable cations (except sodium) average 33 per cent for twenty-two samples taken on the same occasion at three locations. This spatial variability prevented detection of any additional seasonal trends during a 22-week summer sampling period. It is essential to consider the importance of spatial variability in any pedological or ecological study.