交换性阳离子组成、养分全量及速效含量可作为评价红粘土红壤化学肥力演化的指标。
The composition of exchangeable cation and the soil nutrient content can be used as the indexes to evaluate soil chemical fertility evolution, especially the former is more important.
“全树利用”及其短轮伐期经营制度是导致林地养分衰竭和生产力下降的主要原因。
It is believed that all tree utilization and short rotation system were main factors responsible for nutrient depletion and productivity decline of the stand sites.
土壤有机质含量、全量养分含量和速效养分含量均在采伐初期2～ 5年增加，随后又迅速减少，尤其是表层土壤变化更为明显；
The organic matter content as well as the total and available contents of nutrients increased at the first 2~5 years, and then declined rapidly, especially for those in topsoils.
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