Nutrient use of plant-soil systems in a tropical forest.

本研究在泰国北部高马国家公园进行了为期16个月的植物-土壤系统养分利用效率的研究。在高马国家公园的常绿山林中建立了一个50m×100m的研究点，并进行了以下研究。通过对土壤养分库、土壤矿化速率和土壤凋落物分解速率的分析，估算土壤养分供应速率。对研究区林内和林外降水的养分供应进行了估算。通过对溪水的分析，估算了森林生态系统的养分输出。利用一种新发明的方法对腐烂落叶的渗滤液进行了测定。在8个月的时间里，研究小区内凋落物的分解过程，雨季的分解速率高于旱季。在研究区测得土壤呼吸作用，在雨季土壤呼吸作用明显较高。

Nutrient using efficiency of plant-soil systems in the tropical rorests in the North Thailand was studied over a 16 months in the national park at Kog Ma.A study site of 50 m x 100 m was established in a hill evergreen forest at Kog Ma National park and the following measurements were carried out in this study plot.1. The nutrient supply rates of soils were estimated through the analysis of nutrient pools in soils, the mineralization rates of soils and the decomposition rates of litter in the soils.2. The nutrient supply from the precipitation was estimated in t open and within forest in the study plot. The output of nutrients from forest ecosystem was estimated by the analysis of stream water.3. The leachates of decomposing leaf litter were measured using a newly invented method in the study plot.4. Decomposition processes of leaf litter were studied over a 8 months in the study plot, and the decomposition rates were higher in the rainy season than in the dry season.5. Soil respiration was measured in the study plot, and was significantly high in the rainy season.