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首页> 外文期刊>Journal of Tropical Ecology >Nutrient fluxes in bulk precipitation, throughfall and stemflow in montane subtropical moist forest on Ailao Mountains in Yunnan, south-west China
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Nutrient fluxes in bulk precipitation, throughfall and stemflow in montane subtropical moist forest on Ailao Mountains in Yunnan, south-west China

机译：云南西南地区哀牢山山地亚热带湿润森林大量降水，穿透降雨和茎流中的养分通量

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摘要

A study of nutrient movement through rainfall, throughfall and stemflow, as well as epiphytic bryophyte (moss and liverwort) biomass and its effect on nutrient composition of stemflow, was conducted for 2 y in subtropical montane moist forest (Lithocarpus-Castanopsis association) at Xujiaba, Ailao Mountain National Nature Reserve, Yunnan, south-west China. Base cation and fluxes were increased in throughfall, while NH4+-N and NO3--N were reduced relative to precipitation. Annual throughfall inputs of N, P, Ca and S were mainly from precipitation, while most K and two-thirds of Mg throughfall input was due to canopy leaching. Input of Na in the precipitation and throughfall was low in this forest. Net flux (throughfall flux minus bulk precipitation) and deposition ratios (ratio of throughfall flux to bulk precipitation flux) were in the low part of the range reported for other tropical montane rain forests. The throughfall data for this forest reveal generally low cycling rates for mineral elements. Abundant epiphytic bryophytes on bole bark affected the chemical composition of stemflow by selective uptake or release of elements. Relative to trees without epiphytic bryophytes, the annual amounts of total N, NH4+-N, Mg, Na. and SO42--S were enhanced, while NO3--N, K, P and Ca were depleted in stemflow. Contributions of N from nitrogen-fixing organisms are likely to be constrained by low temperatures.
机译：在徐家坝亚热带山地湿润森林中（Lithocarpus-Castanopsis协会）研究了通过降雨，穿透和茎流以及附生苔藓植物（苔藓和地艾）生物量的养分运动及其对茎流养分组成的影响的研究，研究了2年。 ，云南哀牢山国家级自然保护区，中国西南。相对于降水，碱阳离子和通量增加，而NH4 + -N和NO3--N减少。氮，磷，钙和硫的全年穿透输入主要来自降水，而大部分钾和三分之二的镁穿透输入是由于冠层浸出造成的。在该森林中，降水和穿透物中的钠输入量较低。净通量（穿透通量减去总降水量）和沉积比（穿透通量与总降水量之比）在其他热带山地雨林报告的范围的低端。该森林的穿透数据表明，矿物质元素的循环速率通常较低。胆树皮上大量的附生苔藓植物通过选择性地吸收或释放元素而影响茎流的化学组成。相对于没有附生苔藓植物的树木，每年的总N，NH4 + -N，Mg，Na含量。 SO42-S含量增加，而茎干中NO3--N，K，P和Ca减少。来自固氮生物的氮的贡献很可能受到低温的限制。

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