Decomposition of Metrosideros polymorpha leaf litter along elevational gradients in Hawaii
Decomposition of Metrosideros polymorpha leaf litter along elevational gradients in Hawaii
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DOI：
10.1046/j.1365-2486.2000.00282.x
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发表时间：
2000-01
影响因子：
11.6
通讯作者：
P. Scowcroft;D. Turner;P. Vitousek
中科院分区：
文献类型：
--
作者：
P. Scowcroft;D. Turner;P. Vitousek
我们研究了温度，土壤发育和分解之间的相互作用，在三个海拔梯度，每个的上端和下端位于一个共同的熔岩流或灰存款。我们使用了相互移植技术来估计Metrosideros polymorpha叶凋落物的分解率在三年的时间内，在每个梯度的温暖和凉爽的结束。凋落物质量最差的早期土壤发育或土壤最强烈的淋溶和水浸。在原位凋落物分解是最慢的年轻的1855流（k= 0.26和0.14，在低海拔和高海拔，分别）。更肥沃的Laupahoehoe梯度也支持更快的原位衰减在温暖的低海拔站点（k= 0.90）比在高海拔（k= 0.51）。最先进的土壤发展的梯度表明，在低海拔和高海拔（k= 0.88和0.99，分别）可能是由于低海拔土壤养分的有效性低，这抵消了温暖的温度的影响，在原地腐烂没有什么区别。比较原位，共同凋落物，和共同的网站实验表明，网站因素影响分解比凋落物质量没有。然而，温度的影响可能会被土壤肥力或其他场地因素所掩盖。这种类型的场梯度的研究产量变量估计表观Q10，即使在最好的条件下，由于温度，湿度，养分供应，分解群落和凋落物质量之间的相互作用。这种相互作用可能随着气候变化而发生，就像它们沿着海拔梯度一样。
We examined interactions between temperature, soil development, and decomposition on three elevational gradients, the upper and lower ends of each being situated on a common lava flow or ash deposit. We used the reciprocal transplant technique to estimate decomposition rates of Metrosideros polymorpha leaf litter during a three‐year period at warm and cool ends of each gradient. Litter quality was poorest early in soil development or where soils were most intensely leached and waterlogged. In situ litter decomposition was slowest on the young 1855 flow (k= 0.26 and 0.14 at low and high elevation, respectively). The more fertile Laupahoehoe gradient also supported more rapid in situ decay at the warmer low elevation site (k= 0.90) than at high elevation (k= 0.51). The gradient with the most advanced soil development showed no difference for in situ decay at low and high elevations (k= 0.88 and 0.99, respectively) probably due to low soil nutrient availability at low elevation, which counteracted the effect of warmer temperature. Comparisons of in situ, common litter, and common site experiments indicated that site factors influenced decomposition more than litter quality did. The effect of temperature, however, could be over‐ridden by soil fertility or other site factors. Field gradient studies of this sort yield variable estimates of apparent Q10, even under the best conditions, due to interactions among temperature, moisture, nutrient availability, decomposer communities and litter quality. Such interactions may be as likely to occur with changing climate as they are along elevational gradients.