Decomposition of Chaparral Shrub Foliage
Decomposition of Chaparral Shrub Foliage
复制标题
丛林灌木叶子的分解
DOI：
10.2307/1939188
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发表时间：
1985
期刊：
影响因子：
4.8
通讯作者：
W. Schlesinger
中科院分区：
文献类型：
--
作者：
W. Schlesinger
本文采用凋落物袋法，在南加州沿海山区两个海拔高度对两种乔木灌木（Ceanothus megacarpus，一种常绿硬植物）和鼠尾草（Salvia mellifera，一种干旱落叶植物）凋落叶的分解进行了为期3年的研究。不同物种间的分解速率相似。凋落物层有机质的平均停留时间为5.3 ~ 7.7年。N和P在海藓凋落物中被固定，在3年的时间内，这些养分没有净释放。在初始磷浓度较高的丹参凋落物中，只有N被固定，在分解过程中，抗性“木质素”物质的数量增加，但没有迹象表明这些物质含有固定的N和p，特别是在老林分中，可能受到p的限制。凋落物层的平均停留时间表明，成熟灌木林的分解对有效养分的供应很重要。
Decomposition of leaf litter from two chaparral shrubs, Ceanothus megacarpus (an evergreen sclerophyll) and Salvia mellifera (a drought—deciduous species), with studied using litter bag methods for a 3—yr period at two elevations in the coastal mountains of southern California. The decomposition rates were similar between species. Mean residence time for the organic matter in the litter layer was 5.3—7.7 yr. N and P were immobilized in the litter of Ceanothus, which showed no net release of these nutrients during the 3—yr period. Only N was immobilized in Salvia litter, which had high initial concentrations of P. During decomposition the amount of resistant “lignin” substances increased, but there was no indication that these substances contained the immobilized N and P. The growth of Ceanothus chaparral may be limited by P. especially in old stands. The mean residence time for the litter layer suggests that decomposition is important to the supply of available nutrients in mature chaparral.